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1

Eocene Paleolatitude of the Kitakami Massif in Northeastern Japan  

NASA Astrophysics Data System (ADS)

The geologic basement of the Japan Arc consists primarily of rocks formed by subduction-related processes. Mesozoic to Cenozoic accretionary complexes are the vast majority of the subduction-related products, but there are also many fragments of ancient continents or volcanic islands or seamounts of different sizes, characterized by lithologies and geologic histories distinct from surrounding rocks. The South Kitakami Massif in northeastern Japan is typical of those allochthonous units. Early paleomagnetic studies demonstrated that the sedimentary rocks of the South Kitakami Massif have completely been remagnetized by intrusion of Cretaceous plutons. Recently, shallow paleomagnetic inclinations were reported from early Cretaceous and early Paleogene volcanic rocks of the Northern Kitakami Massif, leading to an interpretation that the whole Kitakami Massif was located at low latitude in the Cretaceous to early Paleogene. Here we present new paleomagnetic results from the Northern Kitakami Massif. Dacite dikes of Eocene age (ca. 44 Ma) and baked country rocks were sampled at 16 sites. The dikes possess vertical or subvertical intrusion surfaces, suggesting little or no significant tectonic tilt. We obtained for the first time an Eocene reliable paleomagnetic direction for the Kitakami massif; a positive baked contact test proves the primary nature of remanence. A suggestion that pre-Miocene rocks of northeastern Japan have completely been remagnetized can be eliminated. The mean direction is characterized by a westerly declination, indicating large counterclockwise rotation. Miocene rotational motion of the northeastern Japan Arc associated with backarc opening can account for this westerly direction. The mean inclination is statistically indistinguishable from that expected at the present latitude of the studied area, indicating little or no significant latitudinal motion. This finding provides a constraint on the suspected northward motion; the Kitakami Massif has not suffered latitudinal motion since at least Eocene time.

Hoshi, H.; Hayakawa, K.

2011-12-01

2

Precise P and S wave velocity structures in the Kitakami massif, Northern Honshu, Japan, from a seismic refraction experiment  

NASA Astrophysics Data System (ADS)

The Kitakami massif, which is located in the eastern part of Northern Honshu, Japan, is composed of two geological units. The northern Kitakami terrane is characterized as a Jurassic accretionary complex, while the southern Kitakami terrane consists of pre-Silurian basement and Silurian-lower Cretaceous marine sediments. The boundary region of these two units, called the Hayachine tectonic belt (HTB), is composed of mafic to ultramafic rocks. The Kitakami massif experienced intense granitic intrusions in the Cretaceous. We present a detailed crustal structure model for the eastern part of the massif derived from an extensive seismic refraction experiment conducted on a 194-km N-S line. The uppermost crust is covered with a very thin (0.5-1 km) surface layer with a velocity of 3.1-5.4 km/s. The velocity structure below this layer shows remarkable lateral variation. In the northern Kitakami terrane the P wave velocity and V(sub p)/V(sub s) at the top of the basement are 5.85-5.95 km/s and 1.68-1.70, respectively. The seismic attenuation in this region is high (Q(sub p) = 150-200 and Q(sub s) = 70-100). In contrast, the uppermost crust in the southern Kitakami terrane is characterized by a high P wave velocity (6.05-6.15 km/s) and V(sub p)/V(sub s) (1.74-1.77). The Q(sub p) and Q(sub s) also show high values of 300-400 and 150-200, respectively. Such a structural difference persists to 14- to 16-km depth, at which the P wave velocity increases to 6.45 km/s. The low velocity and high attenuation in the northern Kitakami terrane represent a highly deformed structure of the accretionary complex. The high P wave velocity and V(sub p)/V(sub s) in the southern Kitakami terrane indicate the relatively mafic crustal composition, which may result from the fragment of the oceanic crust incorporated by the accretion process or the uplifting in the latest Jurassic-early Cretaceous. A midcrustal interface determined from wide-angle reflections shows an abrupt southward depth decrease from 25 to 20 km under the HTB. The P wave velocity and V(sub p)/V(sub s) between 14- and 16-km depth and the midcrustal interface are 6.45-6.55 km/s and 1.74-1.78, respectively. The Moho depth under the northern Kitakami terrane decreases southward from 34 to 32 km. In the southern Kitakami terrane the Moho dips slightly southward. Kitakami massif was not homogenized by the Cretaceous granitic intrusions, and the original structural difference remains in the upper crust.

Iwasaki, Takaya; Yoshii, Toshikatsu; Moriya, Takeo; Kobayashi, Akio; Nishiwaki, Makoto; Tsutsui, Tomoki; Iidaka, Takashi; Ikami, Akira; Masuda, Tetsu

1994-11-01

3

Neoproterozoic tectonic evolution of the Hongseong area, southwestern Gyeonggi Massif, South Korea; implication for the tectonic evolution of Northeast Asia  

NASA Astrophysics Data System (ADS)

The Hongseong area is the south-western part of the Gyeonggi Massif in South Korea and is regarded as the eastward extension of the Dabie-Sulu collision belt in China due to the occurrence of Triassic (~230 Ma) eclogites. Two types of Neoproterozoic metabasites occur together with regionally intruded arc-related Neoproterozoic granitoids (ca. 850-830 Ma) in the Hongseong area. The first type of metabasite (the Bibong and Baekdong metabasites) is a MORB-like back-arc basin basalt or gabbro formed at ca. 890-860 Ma. The Bibong metabasites show light rare earth element (LREE) enriched patterns with LaN = 77.6-255.3 and (La/Yb) N = 2.8-10.7 and the Baekdong metabasite also show light rare earth element (LREE) enriched patterns with LaN = 3.5-5.9 and (La/Yb)N = 0.3-0.4. They may have formed during back-arc opening by diapiric upwelling of deep asthenospheric mantle which was metasomatized by large ion lithophile element (LILE) enriched melt or fluid derived from the subducted slab and/or subducted sediment beneath the arc axis. The second type of metabasite (the Gwangcheon metabasite) formed in a plume-related intra-continental rift setting at 763.5±18.3 Ma and is geochemically similar to oceanic island basalt (OIB) with La N = 197.7-523.2 and (La/Yb)N = 6.6-22.9. The Gwangcheon metabasites show strongly enriched LREE patterns with minor or absent negative Eu anomalies and are slightly depleted in Nb, Ta, Sr, P and Ti reflecting the mixing of upwelling mantle plume with subcontinental lithospheric mantle (SCLM) which is depleted in Ti during subduction stage prior to within-plate rifting . These data indicate a transition in tectonic setting in the Hongseong area from arc to intra-continental rift between ca. 830 and 760 Ma. This transition is well correlated to the Neoproterozoic transition from arc to intra-continental rift tectonic setting at the margin of the Yangtze Craton and corresponds to the amalgamation and breakup of Rodinia Supercontinent. The younger arc ages in the Hongseong area suggest that the amalgamation of Yangtze block started from west and propagated towards east.

Oh, C.; Choi, S.; Rajesh, V.; Lee, J.; Seo, J.; Zhai, M.; Peng, P.

2009-12-01

4

Magnetic and gravity constraints on forearc upper crustal structure and composition, offshore northeast Japan  

USGS Publications Warehouse

Marine magnetic and gravity data from the northeast Japan forearc offer insight to the subsurface structure, density and magnetization from which geologic interpretations and tectonic reconstructions can be made. Positive marine magnetic anomalies, on-land geology, drill hole data, and 2-1/2-dimensional models reveal that Kitakami plutons and possibly their associated volcanic rocks constitute part of the modern forearc basement and lie 100-150 km further east than previously thought. A method to create magnetization and density contrast maps was employed to produce a three-dimensional picture of the forearc basement rock properties averaged over a 14-km thickness. -Author

Finn, C.

1994-01-01

5

Identification of remagnetization processes in Paleozoic sedimentary rocks of the northeast Rhenish Massif in Germany by K-Ar dating and REE tracing of authigenic illite and Fe oxides  

NASA Astrophysics Data System (ADS)

This study combines mineralogical, chemical (rare earth elemental (REE)) and isotopic (K-Ar) data of clay minerals as well as chemical compositions (major and REE) of Fe oxide leachates from remagnetized Palaeozoic sedimentary rocks from NE Rhenish Massif in Germany, for which the causes of remagnetization are not yet clear. The dominant carrier of the syntectonic, pervasive Carboniferous magnetization is magnetite. The Middle Devonian clastic rocks record an illitization event at 348 ± 7 Ma probably connected to a major magmatic event in the Mid-German Crystalline Rise, whereas a second illitization episode at 324 ± 3 Ma is coeval to the northward migrating deformation through the Rhenish Massif, being only detected in Upper Devonian and Lower Carboniferous rocks. The age of that younger illitization is not significantly different from that of the remagnetization, which, however, is not restricted to the upper part of the orogenic belt, but affects also the Middle Devonian strata. The REE patterns of the Fe-enriched leachates support two mineralization episodes with varied oxidation-reduction conditions outlined by varied Eu and Ce anomalies. This is not compatible with a unique, pervasive migration of orogenic fluids on a regional scale to explain the remagnetization in the studied region. While clay diagenesis and remagnetization are time-equivalent in Upper Devonian and Lower Carboniferous rocks, they are not so in Middle Devonian rocks. Transformation of smectite into illite cannot, therefore, account for the growth of associated authigenic magnetite, which must have been triggered by a different process. Since remagnetization and deformation ages are similar, the mechanism could relate to local physical conditions such as pressure solution and changing pore fluid pressure due to tectonic stress as well as to chemical conditions such as changing composition of the pore fluids.

Zwing, A.; Clauer, N.; Liewig, N.; Bachtadse, V.

2009-06-01

6

Petrophysical properties of granite from the Melechov Massif, Czech Republic  

Microsoft Academic Search

The Melechov Massif is a granitic massif constituting the northernmost part of the Central Moldanubian Pluton, which belongs to the Moldanubian zone of the variscan belt in the Bohemian Massif. On an area of cca 100 km2 it is formed by 4 types of granite which are disposed in a concentric manner and are distinguished mainly by their grain size.

Martin Stanek; Stanislav Ulrich; Yves Geraud

2010-01-01

7

Apatite fission-track dating and low-temperature history of the Bavarian Forest (southern Bohemian Massif)  

NASA Astrophysics Data System (ADS)

Apatite fission-track (AFT) dating applied to uplifted Variscan basement blocks of the Bavarian Forest is employed to unravel the low-temperature history of this segment of the Bohemian Massif. Twenty samples were dated and confined track lengths of four samples were measured. Most samples define Cretaceous APT ages between 110 and 82 Ma (Albian to Campanian) and three samples give older ~148-140 Ma (Jurassic-Cretaceous boundary) ages. No discernible regional age variations exist between the areas north-east and south-west of the Pfahl shear zone, but >500 m post-Jurassic and post-Cretaceous vertical offsets along this and other faults can be inferred from elevation profile analyses. The AFT ages clearly postdate the Variscan exhumation history of the Bavarian Forest. Thermal modeling reveals that the ages are best explained by a slight reheating of the basement rocks to temperatures within the apatite partial annealing zone during the middle and late Jurassic and/or by late Cretaceous marine transgression causing burial heating, which affected marginal low-lying areas of the Bohemian Massif and the Bavarian Forest. Late Jurassic period was followed by enhanced cooling through the 120-60 °C temperature interval during the subsequent exhumation phase for which denudation rates of ~100 m myr-1 were calculated. On a regional scale, Jurassic-Cretaceous AFT ages are ubiquitous in marginal structural blocks of the Bohemian Massif and seem to reflect the exhumation of these zones more distinctly compared to central parts.

Vamvaka, A.; Siebel, W.; Chen, F.; Rohrmüller, J.

2013-08-01

8

Phanerozoic tectonics of south China block: New insights from the polyphase deformation in the Yunkai massif  

NASA Astrophysics Data System (ADS)

The Yunkai massif is a key region to decipher the tectonic evolution of the south China block since the contained high-grade metamorphic rocks experienced a polyphase deformation. The earliest event (D1) corresponds to a top-to-the-northwest ductile shearing, coeval with amphibolite facies metamorphism, probably developed during a postorogenic synmigmatization extensional event occurred in early Paleozoic time. The main ductile deformation (D2) is top-to-the-northeast shearing, occurred in early Mesozoic time, coeval with amphibolite to greenschist facies metamorphism and associated with the development of northeast verging recumbent folds within the Neoproterozoic-Paleozoic sedimentary cover of the south China block. The tectonic significance of D2 is possibly linked with the subduction of Indochina beneath south China along the Song Ma belt of North Vietnam. Another compressional event (D3) of Late Jurassic to Cretaceous age is indicated by SE verging recumbent folds with NE-SW trending axes developed both in the sedimentary cover and gneissic basement. The northwestward subduction of the Pacific plate or the SE thrusting of the Songpan-Ganzi fold belt upon the Yangtze craton can be considered as the geodynamic causes of this late Mesozoic event. Last, NE-SW trending brittle sinistral strike-slip and normal faulting (D4) control the massif uplifting and the subsiding of continental half grabens. This structure, which is widespread in the eastern margin of the Eurasia continent, can be related either to the westward subduction of the Paleo-Pacific plate or to lithosphere removal during the late Mesozoic.

Lin, Wei; Wang, Qingchen; Chen, Ke

2008-12-01

9

Structures along the contact zone between the Lycian nappes and the Menderes Massif, SW Turkey: Implications for tectonic transport directions of the Lycian nappes  

NASA Astrophysics Data System (ADS)

Structural data recorded along the contact zone between the Menderes Massif and the overlying Lycian nappes provide information about tectonic transport directions of the Lycian nappes in southwestern Turkey. Key units were investigated in the Milas region. Flysch-type sedimentary rocks form the uppermost unit of the Menderes Massif. Metapelites and metapsammites form the basal unit of the Lycian nappes. The metasediments of the Lycian nappes overlie the Menderes Massif along a south-dipping, low-angle tectonic contact, along which thin slices of sheared serpentinite are found. The kinematic data suggest the presence of three deformation phases in the Milas region. The first deformation phase (D1) is characterised by a ductile deformation with top-to-the-NE sense of shear suggesting that the lowermost unit of the Lycian nappes was emplaced initially from southwest to northeast onto the Menderes Massif during the Early Eocene. The second deformation phase (D2) is also ductile in nature. It is characterised by an E-W-trending stretching lineation with a bivergent sense of shear, which is probably related to the load of the overlying nappes. A third deformation phase (D3) is characterised by south-dipping normal faults with top-to-the-S sense of movement and can be related to southward movement of the Lycian nappes along a low-angle décollement zone.

Arslan, Arzu; Güngör, Talip; Erdo?an, Burhan; Passchier, Cees W.

2010-05-01

10

Neogene exhumation history of the Mont Blanc massif, western Alps  

NASA Astrophysics Data System (ADS)

The contribution of climate and tectonics to the Neogene exhumation history of the European Alps is studied in the Mont Blanc (MB) massif using low-temperature thermochronology. Apatite fission track and (U-Th-[Sm])/He data suggest that the MB massif was exhumed episodically: Rapid exhumation (2.5 ± 0.5 km/Ma) before 6 Ma is followed by an episode of slow exhumation and a period of accelerated exhumation (>1 km/Ma) after ˜3 Ma. Comparing the exhumation rates of the MB massif with reported exhumation rates of all other external crystalline massifs (ECM) shows that the MB massif is the only ECM that experienced rapid exhumation before 6 Ma, which is possibly related to NW and minor SE directed thrusting of the MB massif. The data demonstrate that the Messinian base level drop (˜5.5 Ma) and the increase in atmospheric moisture caused by an intensification of the Atlantic Golf Stream (4.6 Ma) did not affect the exhumation of the external Alps. All ECM, except the Gotthard massif, show an increase in exhumation rates at ˜3 Ma. We interpret this as the result of normal faulting along orogen-parallel faults and beginning Alpine glaciation. The relative impact of these processes on the exhumation of the ECM can vary spatially and temporally, mainly depending on differences in geology and geomorphology. In the case of the MB massif we propose that the acceleration in exhumation rates at ˜3 Ma is caused by rapid valley incision related to glaciation, and that the recent relief of the MB massif is thus a young feature.

Glotzbach, C.; Reinecker, J.; DanišíK, M.; Rahn, M.; Frisch, W.; Spiegel, C.

2008-08-01

11

Neogene exhumation history of the Mont Blanc massif, western Alps  

Microsoft Academic Search

The contribution of climate and tectonics to the Neogene exhumation history of the European Alps is studied in the Mont Blanc (MB) massif using low-temperature thermochronology. Apatite fission track and (U-Th-[Sm])\\/He data suggest that the MB massif was exhumed episodically: Rapid exhumation (2.5 +\\/- 0.5 km\\/Ma) before 6 Ma is followed by an episode of slow exhumation and a period

C. Glotzbach; J. Reinecker; M. Danisík; M. Rahn; W. Frisch; C. Spiegel

2008-01-01

12

Neogene exhumation history of the Mont Blanc massif, western Alps  

Microsoft Academic Search

The contribution of climate and tectonics to the Neogene exhumation history of the European Alps is studied in the Mont Blanc (MB) massif using low-temperature thermochronology. Apatite fission track and (U-Th-[Sm])\\/He data suggest that the MB massif was exhumed episodically: Rapid exhumation (2.5 ± 0.5 km\\/Ma) before 6 Ma is followed by an episode of slow exhumation and a period

C. Glotzbach; J. Reinecker; M. Danišík; M. Rahn; W. Frisch; C. Spiegel

2008-01-01

13

Re-Os geochemistry and geochronology of the Ransko gabbro-peridotite massif, Bohemian Massif  

NASA Astrophysics Data System (ADS)

The Ransko gabbro-peridotite massif in Eastern Bohemia is a strongly differentiated intrusive complex, which hosts low-grade Ni-Cu ores mainly developed close to the contact of olivine-rich rocks with gabbros, in troctolites, and to a much lesser extent in both pyroxene and olivine gabbros and plagioclase-rich peridotites. Gabbro, troctolite, peridotite and Ni-Cu ores from the Jezírka Ni-Cu (PGE) deposit, considered to be a typical example of the liquid segregation style of mineralization, were analyzed for Re-Os concentrations and isotopic ratios. Seven barren and mineralized samples from the Jezírka deposit yielded a Re-Os regression of 341.5 ± 7.9 Ma (MSWD = 69). Strongly mineralized peridotite with mantle-like initial 187Os/188Os ratio of 0.125 suggests that Os as well as other PGE present in the Ni-Cu mineralization are predominantly of mantle origin. On the other hand, barren and low-mineralized samples have radiogenic initial 187Os/188Os ratios of 0.14-0.16 suggesting some import of Re and/or radiogenic 187Os most likely through contamination by continental crust during magma emplacement. The Re-Os age of the Ransko Massif is significantly younger than the previously suggested Lower Cambrian age, but it is similar to and/or younger than the age of metamorphism of the adjacent Kutná Hora crystalline complex and the Moldanubian unit. Therefore, it is likely that the emplacement of the Ransko massif and its Ni-Cu mineralization was closely connected with the late-stage evolution of the Kutná Hora crystalline complex.

Ackerman, Lukáš; Pašava, Jan; Erban, Vojt?ch

2013-10-01

14

Lower crustal source for massif anorthosites  

SciTech Connect

Proterozoic massif anorthosites have very low Rb/Sr ratios, variable commonly unsupported /sup 87/Sr//sup 86/Sr ratios, positive Eu anomalies, and a wide range in element of/sub Nd/ (+4 to -6) which show a correlation with the crustal provinces in which the anorthosites occur, suggestive of a crustal source. Typical models for the development of the continental crust include a massive episodic growth from the mantle in the Late Archean followed 100-200 m.y. later by intracrustal melting to produce upper crustal granites, leaving an Eu and Al-rich lower crust, depleted in Rb, with increased Sm/Nd ratios. Melting of this lower crust in the Proterozoic can produce dry plagioclase-rich melts, enriched in Eu, with low Rb/Sr ratios, unsupported /sup 87/Sr//sup 86/Sr ratios (inherited from the precursor history) and variable Sm/Nd (and element of/sub Nd/) reflecting previous complex crustal history. Since the granite melting episode removed the heat-producing elements into the upper crust, a separate heat source is required. Movement of the crust over a mantle plume of mid-ocean ridge type could account for the linear distribution of anorthosites, and their association with failed rift environments.

Taylor, S.R.

1985-01-01

15

Heat and moisture exchange of newly denuded rock massif with a chamber of an underground building  

Microsoft Academic Search

The article presents formulas describing the fields of temperature and potential of moisture transfer in a massif, and also the dependences for calculating the heat and moisture flow from the massif into the air.

O. A. Kremnev; V. Ya. Zhuravlenko; V. A. Shelimanov; E. M. Kozlov

1984-01-01

16

Northeast Biomanufacturing Jobs  

NSDL National Science Digital Library

The Northeast Biomanufacturing Center and Collaborative (NBC2) has created this page to both distribute news on the biomanufacturing field and provide information on specific job opportunities in the Northeast. The news articles all present positive information about biomanufacturing such as articles titled "Obama to Launch Manufacturing Initiative" and "Biomed industry growing." For assistance with job searching, a collection of links to approximately thirty biomanufacturing companies' job listings are included. Lastly, links to major internet job boards are included.

2011-10-26

17

Induced seismicity in the Khibiny Massif (Kola Peninsula)  

Microsoft Academic Search

The topic of this paper is to review recent processes of increasing seismic activity in the Khibiny Massif in the Kcla Peninsula. It is a typical example of induced seismicity caused by rock deformation due to the extraction of more than 2·109 tons of rock mass since the mid-1960s. The dependence of seismic activity on the amount of extracted ore

Elena O. Kremenetskaya; Victor M. Trjapitsin

1995-01-01

18

Entrepreneurship and Image Management in Higher Education: Pillars of Massification  

ERIC Educational Resources Information Center

|Mass higher education has taken hold in the developed nations, and a widely held belief exists that higher education is a "right." With massification have emerged two notable trends: an entrepreneurial emphasis fuelled by the revenue-cost squeeze ensuing from reduced and realigned government funding; and a quest for differentiation through…

Mount, Joan; Belanger, Charles H.

2004-01-01

19

Cenozoic alkaline volcanism of the Atakor massif, Hoggar, Algeria  

Microsoft Academic Search

The Atakor massif is a part of the Hoggar volcanic province, which was emplaced on top of a basement swell initiated during the Cretaceous. There have been three main episodes of volcanic activity since the Miocene, separated by long periods of qui- escence. The lava fl ows and domes were emitted along lithosphere-scale fault zones. With its famous scenery, the

Abla Azzouni-Sekkal; Bernard Bonin; Amel Benhallou; Rachid Yahiaoui; Jean-Paul Liégeois

2007-01-01

20

Native osmium from the Guli Massif, Northern Siberia, Russia  

NASA Astrophysics Data System (ADS)

Native osmium from two different placer occurrences (i.e., Ingaringda and Burlakovsky) within the Guli Massif, Maimecha-Kotui Province, was evaluated for mineral compositions that show systematic differences between the localities. Grains of native osmium show increases in iridium towards the rim, and nuggets consisting of aggregates define trends of preferential substitution of osmium by iridium. A statistically reliable difference in Os/Ir ratios between the two studied placers can be demonstrated. From textural and compositional characteristics it is concluded that the native osmium of the Burlakovsky placer formed at temperatures higher than can be assumed to be reasonable for crustal conditions. The difference in the Os/Ir ratios between the two placers can be attributed to fractional crystallization of native osmium either in the mantle source, which was tapped in different events to form the Guli Massif, or to decreasing Os/Ir values during crystallization under crustal conditions after intrusion of the silicate melt(s).

Merkle, Roland K. W.; Malitch, Kreshimir Nenadovitch; Gräser, Peter P. H.; Badanina, Inna Yu.

2012-01-01

21

L'or dans la métallogenie du massif de Bohême  

NASA Astrophysics Data System (ADS)

The origin of the gold deposits in the Bohemian Massif is genetically explained by three metallogenic models of various importance in individual stages of the geotectonic development (?700-280 MA): a volcanogenic model for lithologically controled premetamorphic Au-sulfidic mineralizations resulting from submarine-hydrothermal processes associated with Lower Paleozoic and/or Upper Proterozoic volcanism. The gold is very fine, closely associated with base metals;

Morávek, P.; Pouba, Z.

1990-12-01

22

L'or dans la métallogenie du massif de Bohême  

Microsoft Academic Search

Résumé  Les minéralisations aurifères du massif de Bohême sont représentées par plusieurs types morphologiques et paragénétiques,\\u000a dont l'origine est expliquée par trois modèles genétiques: I — un modèle volcanogénique pour les minéralisations sulfurés\\u000a stratiformes, II — un modèle hydrothermal-métamorphique pour les minéralisations de quartz aurifères synmétamorphiques, de\\u000a morphologie très variable et caractérisées par la présence de minéraux de Bi, Te, Mo

P. Morávek; Z. Pouba

1990-01-01

23

Miocene mass-transport sediments, Troodos Massif, Cyprus  

USGS Publications Warehouse

Sediment mass-transport layers of submarine origin on the northern and southern flanks of the Troodos ophiolitic massif are dated biostratigraphically as early Miocene and late Miocene, respectively and therefore represent different seismogenic events in the uplift and erosional history of the Troodos terrane. Analysis of such events has potential for documenting Miocene seismic and uplift events regionally in the context of changing stress field directions and plate vectors through time. ?? 2009 The Geologists' Association.

Lord, A. R.; Harrison, R. W.; BouDagher-Fadel, M.; Stone, B. D.; Varol, O.

2009-01-01

24

Detachment Shear Zone of the Atlantis Massif Oceanic Core Complex  

NASA Astrophysics Data System (ADS)

Near-bottom investigations of the cross section of the Atlantis Massif exposed in a major tectonic escarpment along the Atlantis Transform Fault provide an unprecedented view of the internal structure of the footwall domain of an oceanic core complex. Integrated direct observations, photogeology, and imaging define a mylonitic, low-angle detachment shear zone (DSZ) along the crest of the massif. The shear zone may project beneath the nearby, corrugated upper surface of the massif. The DSZ and related structures are inferred to be responsible for the unroofing of lower crustal gabbros and upper mantle peridotites by extreme, localized tectonic extension during seafloor spreading over the past 2 m.y. Strongly foliated serpentinites and talc-amphibole schists of the DSZ are about 100 m thick and can be traced continuously for at least 3 km in the spreading direction. Foliated DSZ rocks grade structurally downward into more massive basement rocks that lack a pervasive low-temperature deformation fabric. The main DSZ and underlying basement rocks are cut by discrete, anastomosing normal-slip, shear zones. Widely spaced, steeply dipping, normal faults cut all the older structures and localize serpentinization-driven hydrothermal outflow at the Lost City Hydrothermal Field. A thin (few meters) sequence of sedimentary breccias grading upward into pelagic limestones directly overlies the DSZ and may record a history of progressive rotation of the shear zone from an earlier moderately dipping attitude into its present, gently dipping orientation during lateral spreading and uplift.

Karson, J.; Fruh-Green, G.; Kelley, D.; Yoerger, D.; Jakuba, M.

2005-12-01

25

Recurrent Cenozoic volcanic activity in the Bohemian Massif (Czech Republic)  

NASA Astrophysics Data System (ADS)

Cenozoic anorogenic volcanism of the Bohemian Massif is an integral part of the Central European Volcanic Province. The temporal and spatial distribution of volcanic rocks in the Bohemian Massif, their geochemistry and mineralogy as well as their tectonic setting and paleostress data are used to characterize and classify this volcanic activity. Three main volcanic periods can be distinguished based on K-Ar data and known paleostress fields: (i) pre-rift (79-49 Ma), (ii) syn-rift (42-16 Ma) and (iii) late-rift (16-0.3 Ma), with the youngest period further subdivided into three episodes. The dominant mafic rock types (> 7 wt.% MgO) of all periods are of nephelinite-basanite/tephrite composition. The exceptions are suites of melilitic ultramafic rocks of the pre-rift period in northern Bohemia and of the final episode of the late-rift period in western Bohemia. The most voluminous are volcanic rocks of the syn-rift period occurring in the Oh?e Rift Graben.The initial 87Sr/86Sr (0.7032 to 0.7050) and 143Nd/144Nd (0.51264 to 0.51301) ratios of the mafic volcanic rocks of the Bohemian Massif are characteristic of magmas derived from a sub-lithospheric mantle source. The isotopic ratios resemble those of the HIMU mantle source (206Pb/204Pb ca. 19 to 20). These rocks have the most isotopically depleted compositions among the Central European Volcanic Province volcanics.

Ulrych, Jaromír; Dostal, Jaroslav; Adamovi?, Ji?í; Jelínek, Emil; Špa?ek, Petr; Hegner, Ernst; Balogh, Kadosa

2011-04-01

26

Northeast Sustainable Energy Association  

NSDL National Science Digital Library

Northeast Sustainable Energy Association (NSEA), a chapter of the American Solar Energy Society, is an organization for northeastern United States focused on "promoting the understanding, development, and adoption of energy conservation and non-polluting, renewable energy technologies." NSEA promotes the use of electricity produced through sustainable and non-polluting methods, as well as green transportation and building construction and design through advocacy and education. The NSEA Web site offers some useful tools for homeowners and teachers alike. These include Information About Sustainable Transportation, energy conservation tips, and selected articles from the Northeast Sun (published quarterly). Also available are resources and publications for educators; however, some things are not freely available on the Web and must be ordered from the NSEA.

2001-01-01

27

Northeast Atlantic bathymetric map  

Microsoft Academic Search

The new bathymetric map of the Bay of Biscay and Northeast Atlantic Ocean is based on all available conventional and multibeam data. It extends from the European coast to the mid-Atlantic ridge in longitude and from the Azores-Gibraltar fracture zone to 50^oN in latitude. Grid spacing is one km. The map is in Mercator projection at a 1\\/2,400,000 scale. With

B. Loubrieu; J.-C. Sibuet; S. Monti; J.-P. Mazé

2003-01-01

28

GEOCHEMISTRY AND GEOCHRONOLOGY OF MIDDLE PROTEROZOIC AND SILURIAN FELSIC SILLS IN THE BERKSHIRE MASSIF, MASSACHUSETTS  

Microsoft Academic Search

Discontinuous sills of alaskite in the interior and western margin of the Berkshire massif and granite on the eastern margin of the massif were mapped by Ratcliffe (1984a,1984b; 1985) and Ratcliffe and Hatch (1979), and interpreted by them as syntectonic anatectic melts that intruded Taconic thrusts. The alaskite sills are most commonly found in the Middle Proterozoic Tyringham Gneiss and

Paul Karabinos; David Morris; Michael Hamilton; Nicole Rayner

29

Age, origin, and tectonic significance of Mesoproterozoic and Silurian felsic sills in the Berkshire massif, Massachusetts  

Microsoft Academic Search

Discontinuous sills of felsic gneiss in the interior and western margin of the Berkshire massif and granite sills on the eastern margin of the massif were correlated by Ratcliffe (1984a, 1984b, 1985) and Ratcliffe and Hatch (1979), and interpreted by them as syntectonic anatectic melts that intruded Taconic thrusts. We dated three felsic gneiss sills and two granite sills in

PAUL KARABINOS; DAVID MORRIS; MICHAEL HAMILTON; NICOLE RAYNER

2008-01-01

30

Social Class Barriers of the Massification of Higher Education in Taiwan  

ERIC Educational Resources Information Center

|In recent years, the rapid growth of higher education in Taiwan has led to an essential shift from education for the elite to the massification of higher education. Although this massification is making higher education more accessible, one of the main concerns is whether opportunities for higher education are the same among all social classes in…

Ru-Jer, Wang

2012-01-01

31

PTt trajectory of metamorphic rocks from the central Chiapas Massif Complex: the Custepec Unit, Chiapas, Mexico  

Microsoft Academic Search

The Chiapas Massif, located in the southwestern Maya terrane, is primarily composed of igneous and metaigneous rocks of Late Permian - early Triassic age, although two distinct metasedimentary units have also been recognized. The Sepultura Unit, located in the nothwestern Chiapas Massif, is composed of psammites, pelites and calcsilicate rocks metamorphosed under high-T, low- to medium-P conditions. The Custepec Unit,

Juliana Estrada-Carmona; Bodo Weber; Lutz Hecht; Uwe Martens

2009-01-01

32

Lateritic paleoweathering profiles in French Massif Central: Paleomagnetic datings  

NASA Astrophysics Data System (ADS)

Geological records of the history of ancient land surfaces are scarce and often fragmented by unconformities. Determining the age of these surfaces has long been the limiting factor in correlating continental paleosurfaces with marine basin deposits. Age determination of the weathering product of continental paleosurfaces as well as weathered material within the crystalline basement, is of prime importance for geodynamic reconstruction in general and more so for assessing differential dynamics between basin and basement areas, erosion rates, etc. In this paper, we examine layers of ferruginous kaolinitic paleoweathering products overlying the basement rocks of the French Massif Central. These layers, which are mainly formed in situ and are azoic (devoid of fossils), have been classically related to the "siderolithic" (Eocene-Oligocene) period because of their geographic ties with Tertiary deposits. The paleomagnetic ages of these paleoweathered surfaces have been obtained by comparing their acquired remanent magnetization, converted into paleomagnetic poles, with the APWP (apparent polar wander path) of the Eurasian plate. Recovered ages indicate late Jurassic to early Cretaceous ages (140-160 Ma with a confidence limit of 10 Ma) which are much older than the previously assumed Tertiary age. The ages obtained in this study considerably alter the present knowledge of the geodynamic evolution of the French Massif Central. Our results suggest a lack of sedimentary cover at the Jurassic-Cretaceous boundary. This implies that at the time of deposition of the siderolithic formations, the basement was cropping out and devoid of any Mesozoic cover. Furthermore, the profiles are not compacted, indicating that they have never been buried beneath a significant sedimentary cover. The obtained ages point to a great stability of French Massif Central throughout the Mesozoic, with very low ablation-erosion, while neighbouring basins (Aquitaine and Paris) were subsiding about 2000 m.

Ricordel-Prognon, Caroline; Lagroix, France; Moreau, Marie-Gabrielle; Thiry, MéDard

2010-10-01

33

2. SOUTHWEST VIEW OF NORTH SIDE (NORTHEAST CORNER).. THE NORTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. SOUTHWEST VIEW OF NORTH SIDE (NORTHEAST CORNER).. THE NORTHEAST SIDE OF THE MINE OFFICE IS IN THE BACKGROUND. - Juniata Mill Complex, Mill Camp Shed, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

34

Northeast Atlantic bathymetric map  

NASA Astrophysics Data System (ADS)

The new bathymetric map of the Bay of Biscay and Northeast Atlantic Ocean is based on all available conventional and multibeam data. It extends from the European coast to the mid-Atlantic ridge in longitude and from the Azores-Gibraltar fracture zone to 50^oN in latitude. Grid spacing is one km. The map is in Mercator projection at a 1/2,400,000 scale. With respect to previously published maps, the detailed morphology of Eurasian and Iberian continental margins, a complete picture of the two fossil trajectories of the Bay of Biscay triple junction, which limit the western extension of the Bay of Biscay, and the precise location of the plate boundary between Eurasia and Iberia, which was active during the Tertiary, are now available. The Bay of Biscay and Northeast Atlantic opened simultaneously between chrons M0 (118 Ma) and 33o (80 Ma). A triple junction existed during that period. Fossil triple junctions trajectories on each of the three Eurasia (EU), Iberia (IB) and North America (NA) plates separate oceanic domains which were formed between the three plate pairs: IB/EU for the Bay of Biscay, EU/NA and IB/NA for the northern and southern portions of the Northeast Atlantic respectively. On each side of the fossil trajectories, rift directions formed between different plate pairs present different azimuths. The two eastern branches have been identified on the basis of available bathymetric, magnetic and seismic data. They are generally associated with a basement ridge whose bathymetric expression is clearly shown in their youngest parts. The intersections of these two fossil trajectories with the base of the continental margins are conjugate points before the opening of the Bay of Biscay, giving an independent constraint for plate reconstructions at M0 time. In a companion poster, we have used the constraints deduced from the new bathymetric map to derive the IB/EU kinematic motions and discuss their consequences on the formation of Pyrenees.

Loubrieu, B.; Sibuet, J.-C.; Monti, S.; Mazé, J.-P.

2003-04-01

35

Petrophysical properties of granite from the Melechov Massif, Czech Republic  

NASA Astrophysics Data System (ADS)

The Melechov Massif is a granitic massif constituting the northernmost part of the Central Moldanubian Pluton, which belongs to the Moldanubian zone of the variscan belt in the Bohemian Massif. On an area of cca 100 km2 it is formed by 4 types of granite which are disposed in a concentric manner and are distinguished mainly by their grain size. All the granites are two-mica S-granites considered to be product of polyphase intrusion of magma issued from partial melting of the surrounding variscan metasediments. Relative to the variscan orogeny, the granites are considered to be post-orogenic and are related to isothermic decompression of upper- to middle-crust during collapse of the orogeny-thickened lithosphere. Ages of cooling derived from radiometric dating on monazites give values for all of the types 315 ± 10 Ma. The granite massif suffered brittle deformation related to cooling and induced volume contraction creating systems of joints and, in a lesser measure, faults. The Melechov massif was intensely studied during the last two decades, mainly because it has been established as a testing locality by the radioactive waste repository authority (RAWRA) of the Czech Republic. We have the intention to complement the studies done so far by detailed petrophysical and microstructural analysis of samples taken with respect to macroscopic brittle structures. Several methods are employed to reveal important differences in rock samples collected from distinct geological setting from surface outcrops, quarries and a borehole. The concerned petrophysical properties and/or related experimental methods are namely: thermal conductivity, permeability, porosity, P-wave velocity measurements; in most cases the anisotropy of these quantities is crucial. Preliminary analyses of permeability and porosity show low porosity ranging from 3,8 % for coarse-grained variety to 1,3 % for fine-grained variety and very low permeability ranging from X.10-18 m2 for fine-grained variety to X.10-20 m2 for coarse-grained variety. Preliminary analyses of P-wave velocity at low confining pressures (< 100 MPa) show values of more than 10 % of anisotropy for coarse-grained samples and 4-10 % of anisotropy for medium- to fine-grained samples. Analyses of thermal conductivity (TC) using high resolution optical scanning show several distinct phenomena affecting this quantity. Joint- or fissure-related oxide alteration in samples from outcrops and at shallow levels of borehole gives relative rise to TC values by cca 10 %, closed fissures reduce the TC by up to 20 %, mineralogy inhomogeneities result into increase of about 10 %. To specify and to increase the confidence of our results on borehole samples, which are suspect to be critically too small relative to the prerequisities of the used TC method, we will investigate the influence of volumetric dimensions of sample on the TC values as well as the possible error induced by measurement on a cylindrical surface as compared to measurement on an „infinite' sample.

Stanek, Martin; Ulrich, Stanislav; Geraud, Yves

2010-05-01

36

Northeast Document Conservation Center  

NSDL National Science Digital Library

Founded in 1973, the Northeast Document Conservation Center (NDCC) was created to address the rapid deterioration of older paper-based documents in a number of institutions across New England. On their website, visitors can learn about their conservation and imaging services, and also examine some of their fine resources intended for members of the preservation community. The "Resources" area is a good place to start, as it contains a number of suggestions for preserving private and family collections and also contains a set of additional web-based resources and links. Beyond those materials, there are a number of digitized leaflets here, such as "Assessing Preservation Needs: A Self-Survey Guide" and "Preservation of Library and Archival Materials". The site is rounded out by an excellent disaster assistance section that includes an online disaster planning tool called "dPlan" and a set of general guidelines for archival institutions that may be coping with such situations.

37

Lithosphere thermal structure at the eastern margin of the Bohemian Massif: a case petrological and geophysical study of the Nied?wied? amphibolite massif (SW Poland)  

NASA Astrophysics Data System (ADS)

The crustal section beneath amphibolite Nied?wied? Massif (Fore-Sudetic Block in NE Bohemian Massif), modelled on the basis of geological and seismic data, is dominated by gneisses with subordinate granites (upper and middle crust) and melagabbros (lower crust). The geotherm was calculated based on the chemical analyses of the heat-producing elements in the rocks forming the crust and the measurements of their density and heat conductivity. The results were verified by heat flow calculations based on temperature measurements from 1,600 m deep well in the Nied?wied? Massif and by temperature-depth estimates in mantle xenoliths coming from the nearby ca. 4.5 My basanite plug in Lutynia. The paleoclimate-corrected heat flow in the Nied?wied? Massif is 69.5 mW m-2, and the mantle heat flow is 28 mW m-2. The mantle beneath the Massif was located marginally relative to the areas of intense Cenozoic thermal rejuvenation connected with alkaline volcanism. This results in geotherm which is representative for lithosphere parts located at the margins of zones of continental alkaline volcanism and at its waning stages. The lithosphere-asthenosphere boundary (LAB) beneath Nied?wied? is located between 90 and 100 km depth and supposedly the rheological change at LAB is not related to the appearance of melt.

Puziewicz, J.; Czechowski, L.; Krysi?ski, L.; Majorowicz, J.; Matusiak-Ma?ek, M.; Wróblewska, M.

2012-07-01

38

The exhumation of an HP ophiolitic massif (Voltri Massif, Western Alps): insight from 3D numerical models  

NASA Astrophysics Data System (ADS)

The high-pressure ophiolitic Voltri Massif outcrops at the eastern sector of the Ligurian Western Alps. Highly deformed serpentinite and metasediments wrap eclogite to blueschist facies metagabbro and metabasalt bodies; these lenses have foliated rims and preserve undeformed textures in their cores revealing a strong strain-partitioning. The mechanism that drove the exhumation of these high-pressure rocks has been already analyzed in detail using 2D numerical simulations (Malatesta et al., 2011). In particular they reproduce the subduction process that in the Mesozoic affected the Alpine branch of the Western Tethys. In the Ligurian area subduction was intraoceanic and involved a non-layered oceanic lithosphere with gabbro as discrete bodies inside serpentinized peridotites that were overlain by a limited basaltic cover. The comparison of field and petrologic evidence with model results showed that the exhumation of the high-pressure Voltri rocks was related to the formation of a serpentinite channel above the downgoing slab. This low-viscosity area formed after the hydration of the mantle-wedge rocks by the uprising fluids that migrate from the slab. Buoyancy of the high-pressure serpentinitic mélange that included slices of the slab finally triggered their exhumation. Alpine subduction was however oblique (Marroni and Treves, 1998; Malusà et al., 2011) thus including a trench-parallel left-lateral motion and not only a trench-normal motion as in 2D simulations. We have studied this particular setting through 3D numerical simulations starting from the setup of 2D models. We therefore designed an oceanic basin (500 km-wide) surrounded by continental margins and floored by a non-layered oceanic lithosphere. Subduction starts at a prescribed weak zone in the mantle; the weak zone defines the plate margins geometry. We test different "lateral" geometries of the weak zone (e.g. continuous, segmented). We designed "continuous" weak zones either parallel or increasingly moving away from the continental margins. Moreover, we tested the effect on subduction/exhumation dynamics of varying values of the trench-parallel component of convergence-rate vector. The comparison among field and petrologic data of the Voltri Massif rocks with 3D numerical models results will finally provide a more detailed description of the subduction dynamics acting in the Ligurian-Piedmontese basin and in particular will shed more light on the mechanism that drove the exhumation of the high-pressure ophiolitic Voltri Massif.

Malatesta, C.; Gerya, T.; Crispini, L.; Federico, L.; Scambelluri, M.; Capponi, G.

2012-04-01

39

Hydrogeologic Characterization of the Cachoeira Deposit Massif, Caetite, State of Bahia, Brazil.  

National Technical Information Service (NTIS)

The hydrogeologic applications for the characterization of rock massifs in future mining activity areas are presented. The study was performed in the Cachoeira uranium deposit (Anomaly No. 13 - Lagoa Real Project) located in the south-central portion of t...

J. A. Bottura J. L. Albuquerque Filho L. M. Ojima

1984-01-01

40

Types Of The Focal Mechanisms Of Seismic Events In The Khibiny Massif  

Microsoft Academic Search

The stress-strain state of Khibiny massif and the focal mechanisms of microseismic events (magnitudes as many M=1) were investigated. This analysis was based on seis- mical data registered by automized monitoring system of in the ore mines \\

I. V. Fedotova; S. L. Yunga

2002-01-01

41

Les granites du Massif Central Français: étude comparée des leucogranites et granodiorites  

Microsoft Academic Search

Chemical and mineralogical compositions of granitic rocks of the French Massif Central enable us to classify them into two distinct groups: (i) leucogranites, (ii) granodiorites or quartz-monzonites, separated by a natural gap.

J. Didier; J. Lameyre

1969-01-01

42

Geochemical evolution of the Zadoi Alkaline-Ultramafic Massif, Cis-Sayan area, southern Siberia  

Microsoft Academic Search

The unaltered magmatic rocks of the Zadoi Massif were analyzed for Sr isotopic composition and concentrations of major oxides\\u000a and trace elements by ICP MS. The evolution of the massif involved four phases: (i) perovskite and ilmenite clinopyroxenites,\\u000a (ii) ijolites, (iii) nepheline syenites, and (iv) carbonatites. The perovskite clinopyroxenites have anomalously high Ce\\/Pb\\u000a (223–1132) and Pr\\/Sr 1000 (70–360) ratios at

S. V. Rasskazov; A. M. Il’yasova; A. A. Konev; T. A. Yasnygina; M. N. Maslovskaya; N. N. Fefelov; E. I. Demonterova; E. V. Saranina

2007-01-01

43

Re-Os isotopic evidence for a lower crustal origin of massif-type anorthosites  

Microsoft Academic Search

Massif-type anorthosites are large igneous complexes of Proterozoic age. They are almost monomineralic, representing vast accumulations of plagioclase with subordinate pyroxene or olivine and Fe-Ti oxides-the 930-Myr-old Rogaland anorthosite province in southwest Norway represents one of the youngest known expressions of such magmatism. The source of the magma and geodynamic setting of massif-type anorthosites remain long-standing controversies in Precambrian geology,

Henrik Schiellerup; David D. Lambert; Tore Prestvik; Brian Robins; Jannene S. McBride; Rune B. Larsen

2000-01-01

44

Preorogenic exhumation of the North Pyrenean Agly massif (Eastern Pyrenees-France)  

NASA Astrophysics Data System (ADS)

The Pyrenees, north of the North Pyrenean fault, display a complex structure involving a succession of peridotite massifs, basement massifs, and mid-Cretaceous to Late Cretaceous basins located in a narrow domain, which was affected by a mid-Cretaceous, preorogenic, high-temperature, low-pressure metamorphism. The Late Cretaceous basins were interpreted either as pull-apart basins formed during transcurrent motion of Iberia relative to Eurasia or as remnants of a larger extensional basin. Recent models support that peridotite massifs result from the exhumation of the mantle during this preorogenic event. The northern boundary of the Agly basement massif shows evidence of ductile deformation of the basal formations of the Agly sedimentary cover. Macroscopic and microscopic kinematics indicators consistent with asymmetry of crystallographic fabrics suggest normal sense of shear and thus suggest detachment, at least partial, of the Mesozoic cover from its basement. Triassic to Early Cretaceous limestones are mylonitic and consistently shows a foliation, a NS- to NE-trending lineation, shear criteria suggesting top-to-the-north shearing and locally boudinage. At the microscopic scale, mylonites are characterized by a very fine grain size, frequently <10 µm. They contain larger, partially recrystallized calcite parent grains and undeformed quartz grains with calcite fringes crystallized in pressure shadows. In these mylonites, calcite systematically shows a weak but well-defined crystallographic-preferred orientations, suggesting HT dislocation creep combined to diffusion creep and possibly grain boundary sliding in the finest fraction of the mylonites. Paleotemperatures determined using Raman spectrometry suggest synkinematic temperature conditions in the range 340-390°C, in good agreement with observed microstructures and calcite CPO. The mylonitic fabric in Mesozoic limestones is folded by EW-trending Pyrenean folds north of the Agly basement massif, attesting that this fabric formed before the Pyrenean orogeny. These data consistently support preorogenic extension under medium-temperature conditions of the northern Agly massif and likely of the massif itself. Since simultaneously (~100 Ma) a mid-Cretaceous basin opened south of the basement massif, we suggest a model of preorogenic exhumation of the Agly massif in response to the regional extension associated to the rotation of Iberia. This model may explain the exhumation of the North Pyrenean massifs during a single preorogenic event that allowed the opening of extensional basins and the exhumation of the lithospheric mantle. All these structures being subsequently reworked during the Pyrenean orogeny.

Vauchez, Alain; Clerc, Camille; Bestani, Lucie; Lagabrielle, Yves; Chauvet, Alain; Lahfid, Abdeltif; Mainprice, David

2013-03-01

45

Lateral variation in lithospheric mantle beneath NE Bohemian Massif  

NASA Astrophysics Data System (ADS)

The samples of peridotites forming the subcontinental lithospheric mantle beneath SW Poland have been brought to the surface by alkaline Cenozoic volcanoes of the Central European Volcanic Province. The area of SW Poland belongs to the Variscan Bohemian Massif. The Cenozoic rifting event formed the Oh?e (Eger) Rift with voluminous volcanic sequences in the NW part of the Massif. Miocene lavas with abundant mantle xenoliths occur in SW Poland at the NE prolongation of the Oh?e Rift (e.g. Ksi?ginki nephelinite). The single ca. 4 - 4.5 My xenolith-bearing eruptions occur to the SE of the Rift (Kozákov and Lutynia basanites), which allows the comparison of lithospheric mantle located outside the rifted area to that located close to the rift, and to asses possible changes in the mantle during the time span of ca 20 My. The mantle peridotites from the Ksi?ginki nephelinite are affected by silicate-melt induced cryptic metasomatism resulting in enrichment of clinopyroxene in light REEs. All of them show similar equilibration temperatures in the range of 1000 - 1100 °C. The pyroxenites of similar TE characteristics, some with well preserved cumulative textures, are common in the Ksi?ginki nephelinites. The composite xenoliths show that pyroxenites form the veins in peridotites. These data suggest that at least part of the lithospheric mantle beneath northern termination of Oh?e Rift was affected by silicate melt metasomatism and thermally rejuvenated, and its lithology was modified by addition of pyroxenitic veins. The modification was contemporaneous with volcanism. The peridotite xenoliths occurring in the 4 Ma Kozákov basanites (Czech Republic, ca 25 km SE from Oh?e Rift margin) yield temperatures of equilibration from 680 to 1065 °C (Christensen et al. 2001). The 4.5 My basanites from Lutynia (SW Poland, ca 170 km ESE from the Oh?e Rift) contain peridotites which equlibrated at 960 to 1000 °C. The clinopyroxenes occurring in these peridotites preserved three different kinds of REE patterns, all LREEs enriched and contain common post-garnet spinel-clinopyroxene symplectites (Matusiak-Ma?ek et al., submitted). These data suggest that the lithospheric mantle occurring outside the Oh?e Rift was also metasomatically modified. However, the record of older events is still preserved and the thermal rejuvenation does not occur in all places. The interpretation of lithospheric mantle structure and lithology based on xenoliths brought to the surface by alkaline lavas is subjected to uncertainties arising from accidental sampling, always representing only the parts of mantle penetrated by the lavas. However, the data presented above suggest that the lithospheric mantle occurring in the area of Oh?e Rift was strongly thermally rejuvenated and lithologically modified during Cenozoic, whereas outside the Rift the scale of rejuvenation and modification was smaller. REFERENCES Christensen, N. I., Medaris Jr., L. G., Wang, H. F. & Jelínek, E. (2001). Depth variation of seismic anisotropy and petrology in central European lithosphere: A tectonothermal synthesis from spinel lherzolite. Journal of Geophysical Research 106, B1, 645-664. Matusiak-Ma?ek, M., Puziewicz, J., Ntaflos, T., Grégoire, M., Downes, H. (submitted). Metasomatic effects in the lithospheric mantle beneath the NE Bohemian Massif: a case study of Lutynia (SW Poland) peridotite xenolith. Lithos.

Puziewicz, Jacek; Matusiak-Ma?ek, Magdalena

2010-05-01

46

Kyanite deformation in whiteschist of the UHPM Kokchetav Massif, Kazakhstan  

NASA Astrophysics Data System (ADS)

Microstructures of ultrahigh-pressure metamorphic (UHPM) rocks can provide information on metamorphic and deformation conditions in subduction zones. Kink-banded kyanite in whiteschist from the Kokchetav Massif displays evidence for crystal plastic deformation. The whiteschist, associated with eclogite lenses, is part of UHPM Unit II located south-west of Lake Zheltau in the Kulet region. Equilibrium assemblage is Ky+Grt+Tlc+Phe+Coe/Qtz. Previously reported peak P-T conditions are approximately 3.5GPa at 750C. Strong foliation is defined by Tlc+Phe, with a corresponding, but weaker, preferred orientation of Ky. Crystallographic orientation maps and analyses of Ky blades and inclusions were preformed using electron backscatter diffraction (EBSD) methods. Kyanite blades, up to 10 mm in length, exhibit rotations at kink bands of 10-30 degrees about [010], defining a glide plane of (100). Kyanite inclusions surrounded by Tlc in extensively fractured garnets are 100-500um in diameter, not kink-banded, and with only minor misorientations at the edge of the inclusions. Kink-banding and crystal plastic deformation of kyanite blades is interpreted to have occurred during exhumation to mid-crustal levels because associated quartz grains are optically unstrained and kyanite inclusions in garnet lack evidence for deformation. Further EBSD studies of Omp, Ky, Grt and exsolution phases in UHPM rocks have the potential to lend further insights into subduction zone processes and exhumation mechanisms.

Beane, R. J.

2005-12-01

47

Sedimentary geology as a key to understanding the tectonic evolution of the Mesozoic–Early Tertiary Paikon Massif, Vardar suture zone, N Greece  

Microsoft Academic Search

This paper demonstrates how sedimentary evidence can provide a key to elucidating the regional tectonic and palaeoceanographic significance of a complex partly metamorphic terrane, in this case the Paikon Massif. The Paikon Massif is located centrally within the Vardar–Axios zone of N Greece and is critical to the reconstruction of Neotethys in the E Mediterranean region. The massif is here

Sally A. M. Brown; Alastair H. F. Robertson

2003-01-01

48

The Northeast Brazilian Rift System  

Microsoft Academic Search

The northeast Brazilian rift basins provide important data critical to the understanding of continental rifting processes associated with the opening of the South Atlantic. These basins represent the locus of intersection of the Southern and Equatorial branches and some basins yield substantial chronostratigraphic data that constrain the temporal and spatial interaction of the rift phases. Similar data are not found

Renato M. Darros de Matos

1992-01-01

49

Rainwater composition in northeast Uruguay  

Microsoft Academic Search

The chemical composition of rainfall in northeast Uruguay in 1999 and 2000 and the sources that contribute to the rainwater chemistry are assessed in this study, contributing to a limited knowledge base of rainwater quality in South America. Principal factor analysis and cluster analysis indicate that four main source groups influence the rainfall chemistry over a range of spatial scales.

M. Zunckel; C. Saizar; J. Zarauz

2003-01-01

50

Northeast regional biomass energy program  

Microsoft Academic Search

The management structure and program objectives for the Northeast Regional Biomass Program (NRBP) remain unchanged from previous years. The funding for the eighth year is $600,000. An additional $60,000 was provided by the Bonneville Power Administration Regional Biomass Program to continue the publication of articles in the Biologue. The Western Area Power Administration and the Council of Great Lakes Governors

OConnell

1991-01-01

51

Diffraction of a pulsed longitudinal shear wave in an orthotropic massif with a circular cavity  

SciTech Connect

We propose a method for numerical-analytic solution of a boundary-value problem for diffraction of a longitudinal shear wave in the form of a triangular pulse on a cylindrical tunnel cavity of circular cross-section in an unbounded rectilinearly orthotropic massif. The basis of the proposed approach consists of methods of spectral decomposition of periodically continued pulses with the introduction of small correcting perturbations of the elastic constants of the massif. The characteristics of the stress-strain state in the basic stationary problems are expressed in terms of the generalized wave potentials which become the classical potentials of longitudinal and transverse waves for an isotropic medium. We study the influence of the space-time structure of the pulse on the concentration of the contour dynamical stresses under different phases of mutual position of the leading edge of the pulse and the contour of the section of the cavity in a massif of isotropic and anisotropic basalt.

Nesterova, L.A.; Storozhev, V.I.

1995-09-10

52

Genesis of Zn-Cu deposits in the basic Ransko massif (Eastern Bohemia)  

NASA Astrophysics Data System (ADS)

Watkinson et al. (1978) have reinterpreted the Zn-Cu deposits in the Ransko massif as xenoliths of volcanogenic ores enclosed in and contact-metamorphosed by a basic magma. A detailed reexamination of different xenoliths within the massif, and their comparison with the cordierite hornfelses carriers of Zn-Cu ores, has shown essential differences between them, and confirmed the previous opinions on the metasomatic origin of the deposits. The cordierite hornfels originated by selective magnesian metasomatism of intrusive rocks rich in feldspar (quartz diorite, troctolite), particularly by the replacement of feldspars by cordierite. Around the stocks of cordierite hornfels, a conspicuous concentric metasomatic zonation of rocks developed in mafic intrusives. The Zn-Cu deposits of the Ransko massif resemble sulfide deposits connected with magnesian metasomatism, especially those of the Hitachi area in Japan.

N?mec, D.; Holub, M.

1980-07-01

53

Volcanoes of the Tibesti massif (Chad, northern Africa)  

NASA Astrophysics Data System (ADS)

The Tibesti massif, one of the most prominent features of the Sahara desert, covers an area of some 100,000 km2. Though largely absent from scientific inquiry for several decades, it is one of the world’s major volcanic provinces, and a key example of continental hot spot volcanism. The intense activity of the TVP began as early as the Oligocene, though the major products that mark its surface date from Lower Miocene to Quaternary (Furon (Geology of Africa. Oliver & Boyd, Edinburgh (trans 1963, orig French 1960), pp 1-377, 1963)); Gourgaud and Vincent (J Volcanol Geotherm Res 129:261-290, 2004). We present here a new and consistent analysis of each of the main components of the Tibesti Volcanic Province (TVP), based on examination of multispectral imagery and digital elevation data acquired from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). Our synthesis of these individual surveys shows that the TVP is made up of several shield volcanoes (up to 80 km diameter) with large-scale calderas, extensive lava plateaux and flow fields, widespread tephra deposits, and a highly varied structural relief. We compare morphometric characteristics of the major TVP structures with other hot spot volcanoes (the Hawaiian Islands, the Galápagos Islands, the Canary and Cape Verdes archipelagos, Jebel Marra (western Sudan), and Martian volcanoes), and consider the implications of differing tectonic setting (continental versus oceanic), the thickness and velocity of the lithosphere, the relative sizes of main volcanic features (e.g. summit calderas, steep slopes at summit regions), and the extent and diversity of volcanic features. These comparisons reveal morphologic similarities between volcanism in the Tibesti, the Galápagos, and Western Sudan but also some distinct features of the TVP. Additionally, we find that a relatively haphazard spatial development of the TVP has occurred, with volcanism initially appearing in the Central TVP and subsequently migrating to both the Eastern and Western TVP regions.

Permenter, Jason L.; Oppenheimer, Clive

2007-04-01

54

Geological structures and deformation sequence of the eastern Gyeonggi massif, central Korea  

NASA Astrophysics Data System (ADS)

The Gyeonggi massif, situated between the Nangrim and Yeongnam massifs of the Korean Peninsula, is a Precambrian terrane consists primarily of Archean to Proterozoic crystalline basement. Although the Gyeonggi massif has been suspected as an eastern extension of the Qinling-Dabie collision belt of China, a structural data about the Gyeonggi massif are very short, especially about the eastern part of the Gyeonggi massif. This study focused the deformation sequence of the eastern part of Gyeonggi massif and comparison with that of western part of Gyeonggi massif. At least, five phases of deformational events can be recognized. The first phase of deformation produced gneissic and schistose structures with intrafolial and recumbent folds. During the second phase of deformation, mylonite, mineral lineation, intrafolial recumbent folds and irregular folds were formed. The Bangsan Anticline (BSA) and its sub-order folds were produced by the third phase of deformation. SE-vergent thrust and south-vergent kink folds resulted from the forth and fifth phases of deformation, respectively. Axis of the BSA can be traced over 5km and the representative orientations of two limbs of the BSA are N17°W/32°SE, N29°E/25°NW, respectively. Interlimb angle of the BSA is measured as 128° and can be classified into open fold. Structural transect analysis of regional foliation shows that axis of the BSA is located about 4.6km toward East from longitude 127°53'45?E. If the BSA is correlated with very large-scale NS-trending folds occurred in the western part of the Gyeonggi massif based on characteristics of fold structure, the third phase of deformation can be interpreted in age from the Late Proterozoic to the Early Paleozoic (750~390 Ma). Mylonite of the study area cannot be correlated to the Gyeonggi Shear Zone, which was suggested as post-collisional top-to-the-north extensional structure. The SE-vergent thrust of the forth phase of deformation is probably correlated to the Jeongok thrust, by which the Precambrian basement was thrusted over the Late Triassic-Early Jurassic Gimpo Group.

Kihm, You Hong; Hwang, Jae Ha

2010-05-01

55

Biodiversity impact of the aeolian periglacial geomorphologic evolution of the Fontainebleau Massif (France)  

NASA Astrophysics Data System (ADS)

Landscape features The geomorphology of the Fontainebleau Massif is noteworthy for its spectacular narrow ridges, up to 10 km long and 0.5 km wide, armored by tightly cemented sandstone lenses and which overhang sandy depressions of about 50m. Denudation of the sandstone pans lead to a highly contrasted landscape, with sandstone ridges ("platières") towering sandy depressions ("vallées") and limestone plateaus ("monts"). This forms the geological frame of the spectacular sceneries of the Fontainebleau Massif (Thiry & Liron, 2007). Nevertheless, there is little know about the erosive processes that have built-up these landscapes. Periglacial processes, and among them aeolian ones, appear significant in the development of the Fontainebleau Massif physiography. The periglacial aeolian geomorphology Dunes and dune fields are known since long and cover about 15% to 25% of the Fontainebleau Massif. The aeolian dunes developed as well on the higher parts of the landscape, as well as in the lower parts of the landscape. The dunes are especially well developed in the whole eastern part of the massif, whereas the western part of the massif is almost devoid of dunes. Nevertheless, detailed mapping shows that dunes can locally be found in the western district, they are of limited extension, restricted to the east facing backslope of outliers. Loamy-sand covers the limestone plateaus of the "monts". The loam cover is of variable thickness: schematically thicker in the central part of the plateaus, where it my reach 3 m; elsewhere it may thin down to 0,20-0,30 m, especially at the plateau edges. Blowout hollows are "negative" morphologies from where the sand has been withdrawed. Often these blowouts are decametric sized and well-delimited structures. Others, more complex structures, are made up of several elongated hectometric hollows relaying each other from and which outline deflation corridor more than 1 km long. A characteristic feature of these blowout hollows is the erosion of the sand beneath the bordering sandstone benches, resulting in overhangs. These structures are the most common in the western district of the Fontainebleau Massif. Ponds develop on the tightly silicified and impermeable sandstone pans that form the "platières". There are permanent ponds and temporary wet zones, formed of interconnected or isolated depressions. The origin of these ponds has to be questioned with regard to the landscape shaping. Their origin is directly bound to the hollowing of uncemented, sandy zones, within the sandstone pans forming the "platières". Erosion by runoff cannot be considered; the only way to hollow them out is by deflation processes. No direct dating of the Quaternary dune and loess deposits of the Fontainebleau Massif exists. Nevertheless, dating of paleopodzols interlayered between drift sands, pond deposits and bones within congelifracts allow relating these periglacial features with the end of the last glacial period. For now, there is no dating to assess what belongs to older glacial periods. Distribution of the aeolian patterns The Fontainebleau Massif displays noteworthy morphological diversities in the various districts of the forest. Some of these differentiations result from geological features, but most of them are related to erosion processes, and among them deflation processes leaved different imprints in the western and eastern districts of the Fontainebleau Massif. The topography played an important role controlling the aeolian processes. Deflation was important in the westerly upwind district. In the westerly front face, aeolian erosion was activated by turbulences around the topographic obstacles. The reliefs funneled the winds and gave rise to swirls that hollow the blowouts. This area displays the sharpest and more chiseled landforms of the massif. Moreover, the sandstone scarps at the edge of the "platières" are high and uncovered, with frequent overhangs. The collapsed sandstone blocks of the "chaos" are im

Thiry, M.; Liron, M. N.

2009-04-01

56

Northeast Regional Biomass Energy Program  

SciTech Connect

The Northeast Regional Biomass Program (NRBP) is entering its ninth year of operation. The management and the objectives have virtually remained unchanged and are stated as follows. The program conducted by NRBP has three basic features: (1) a state grant component that provides funds (with a 50 percent matching requirement) to each of the states in the region to strengthen and integrate the work of state agencies involved in biomass energy; (2) a series of technical reports and studies in areas that have been identified as being of critical importance to the development of biomass energy in the region; and (3) a continuous long range planning component with heavy private sector involvement that helps to identify activities necessary to spur greater development and use of biomass energy in the Northeast.

O'Connell, R.A.

1992-02-01

57

Northeast Regional Biomass Energy Program  

SciTech Connect

The Northeast Regional Biomass Program (NRBP) is entering its ninth year of operation. The management and the objectives have virtually remained unchanged and are stated as follows. The program conducted by NRBP has three basic features: (1) a state grant component that provides funds (with a 50 percent matching requirement) to each of the states in the region to strengthen and integrate the work of state agencies involved in biomass energy; (2) a series of technical reports and studies in areas that have been identified as being of critical importance to the development of biomass energy in the region; and (3) a continuous long range planning component with heavy private sector involvement that helps to identify activities necessary to spur greater development and use of biomass energy in the Northeast.

O'Connell, R.A.

1992-04-01

58

Northeast regional biomass energy program  

Microsoft Academic Search

The management structure and program objectives for the Northeast Regional Biomass Program remain unchanged from previous years. The funding for this year however has been considerably reduced permitting the issuance of grants to states to be held to $15,000\\/state. To alleviate this condition, $120,000 of unobligated state grant funds has been transferred to the technical subcontract area. Technical projects have

OConnell

1990-01-01

59

Biodiversity impact of the aeolian periglacial geomorphologic evolution of the Fontainebleau Massif (France)  

Microsoft Academic Search

Landscape features The geomorphology of the Fontainebleau Massif is noteworthy for its spectacular narrow ridges, up to 10 km long and 0.5 km wide, armored by tightly cemented sandstone lenses and which overhang sandy depressions of about 50m. Denudation of the sandstone pans lead to a highly contrasted landscape, with sandstone ridges (\\

M. Thiry; M. N. Liron

2009-01-01

60

Massification, competition and organizational diversity in higher education: evidence from Italy  

Microsoft Academic Search

The article explores whether, and to what extent, several trends that have taken place in most higher education systems in the last few decades – such as massification, privatization, increased competition for students and for research funds – stimulate more diversity between institutions. This question is widely debated, both empirically and theoretically. Using Italian data, the dynamics of organizational diversity

Federica Rossi

2010-01-01

61

Metamorphism on Chromite Ores from the Dobromirtsi Ultramafic Massif, Rhodope Mountains (SE Bulgaria)  

Microsoft Academic Search

Podiform chromitite bodies occur in highly serpentinized peridotites at Dobromirtsi Ultramafic Massif (Rhodope Mountains, southeastern Bulgaria). The ultramafic body is believed to represent a fragment of Palaeozoic ophiolite mantle. The ophiolite sequence is associated with greenschist - lower-temperature amphibolite facies metamorphosed rocks (biotitic gneisses hosting amphibolite). This association suggests that peridotites, chromitites and metamorphic rocks underwent a common metamorphic evolution.

José María González Jiménez; Thomas Kerestedjian; Joaquín Antonio Proenza Fernández; Fernando Gervilla Linares

2009-01-01

62

Contribution to the Study of Geochronological Evolution of Troia Massif-CE, in Brazil.  

National Technical Information Service (NTIS)

The geochronological study of the Massif of Troia-CE, Brazil, for identifying different parastratigraphic units is presented. A previous selection by macroscopic, microscopic and X-ray fluorescence analysis for Rb/Sr determinations in whole rock, and K/Ar...

R. R. Pessoa D. R. Pessoa B. B. Brito Neves K. Kawashita R. A. Fuck

1986-01-01

63

Geomechanical Properties of Shear Zones in the Eastern Aar Massif, Switzerland and their Implication on Tunnelling  

Microsoft Academic Search

Summary ¶Rock zones containing a high fracture density and\\/or soft, low cohesion materials can be highly problematic when encountered during tunnel excavation. For example in the eastern Aar massif of central Switzerland, experiences during the construction of the Gotthard highway tunnel showed that heavily fractured areas within shear zones were responsible for overbreaks in the form of chimneys several metres

S. Laws; E. Eberhardt; S. Loew; F. Descoeudres

2003-01-01

64

Metabasalts from the Troodos Massif, Cyprus: Genetic implication deduced from petrography and trace element geochemistry  

Microsoft Academic Search

A wide variety of data support the contention that the Troodos massif, Cyprus is a fragment of oceanic lithosphere formed at a constructive margin some 85 m.y. ago. However, Troodos rocks differ significantly in major and trace element content and mineral parageneses from those formed at present day active constructive margins. It is here argued that the geochemical and petrographic

John D. Smewing; Kapo O. Simonian; Ian G. Gass

1975-01-01

65

Holocene glaciations in the Ema Glacier valley, Monte Sarmiento Massif, Tierra del Fuego  

Microsoft Academic Search

Investigations carried out in the Ema Glacier valley, Tierra del Fuego, on the eastern side of Monte Sarmiento Massif, enable the recognition of five Holocene glacial events. The oldest glacial advance deposited the so-called external moraines of Ema Glacier, with a probable occurrence between 6000 and 5000 14 C y BP without discarding the potential for these deposits to be from

Jorge Strelin; Gino Casassa; Gunhild Rosqvist; Per Holmlund

2008-01-01

66

Glacial regime of the highest Tien Shan mountain, Pobeda-Khan Tengry massif  

Microsoft Academic Search

Major processes controlling the existence of a large subcontinental glacier system were identified on the basis of glaciological , meteorological and isotopic analyses using expeditionary and long-term data. Observations occurred on the southern Inylchek glacier located in the Pobeda - Khan Tengry massif, the largest subcontinental glacier system in the northern periphery of central Asia. More than 1200 glaciers with

VLADIMIR B. AIZEN; ELENA M. AIZEN; JOHN M. MELACK; DAVID D. SEXTON; VICTOR N. NESTEROV

1997-01-01

67

Dykes, faults and palaeostresses in the Teno and Anaga massifs of Tenerife (Canary Islands)  

Microsoft Academic Search

A structural field study was made of 578 sheet intrusions (mostly dykes) and 153 (mostly normal) faults dissecting the Anaga and Teno massifs, where a complex volcanic succession of Tertiary age (the ‘Old Basaltic Series’) representing the shield-building stage of Tenerife (Canary Islands) crops out. Many of the intrusions, mostly sub-vertical mafic dykes, are emplaced by multiple magma injections, with

L. B. Marinoni; A. Gudmundsson

2000-01-01

68

Evidence of fluid inclusions in metamorphic microdiamonds from the Kokchetav massif, northern Kazakhstan  

Microsoft Academic Search

Microdiamonds from garnet clinopyroxenites of the Kokchetav massif (northern Kazakhstan) and associated alluvial diamonds have been investigated using infrared spectroscopy. All diamonds have high nitrogen contents (from 747 up to 4488 ± 20% at. ppm) and are of type Ib-IaA. Nitrogen data are consistent with a diamond formation over a narrow temperature range. Microdiamonds from garnet clinopyroxenites are characterized by

K De Corte; P. Cartigny; V. S Shatsky; N. V. Sobolev; M. Javoy

1998-01-01

69

Multiple zircon growth during fast exhumation of diamondiferous, deeply subducted continental crust (Kokchetav Massif, Kazakhstan)  

Microsoft Academic Search

Diamondiferous rocks from the Kokchetav Massif, Kazakhstan, represent deeply subducted continental crust. In order to constrain the age of ultra high pressure (UHP) metamorphism and subsequent retrogression during exhumation, zircons from diamondiferous gneisses and metacarbonates have been investigated by a combined petrological and isotopic study. Four different zircon domains were distinguished on the basis of transmitted light microscopy, cathodoluminescence, trace

Jörg Hermann; Daniela Rubatto; Andrei Korsakov; Vladislav S. Shatsky

2001-01-01

70

Influence on groundwater quality of the Paleozoic Brabant Massif in Belgium due to overexploitat ion  

Microsoft Academic Search

The overexploitation of the groundwater resources in the Paleozoic Brabant Massif in the western part of Flanders (Belgium) is causing quantitative problems since several years. The groundwater flow in the aquifer has been studied by means of mathematical modelling, both of the natural and the pumped situation. Hydrogeochemical studies have revealed that the regional groundwater quality distribution is still reflecting

K. WALRAEVENS; L. LEBBE; M. DE CEUKELAIRE; F. MARRAS

71

Tectonic framework of hydrothermal and geothermal systems in the Menderes Massif, western Turkey  

Microsoft Academic Search

The Menderes Massif in western Turkey lies at the eastern margin of the Hellenic subduction zone's continental backarc. Substantial hydrothermal alteration and geothermal activity have accompanied Miocene to recent extensional tectonics. Here we propose that the locations of Cenozoic magmatic, hydrothermal and geothermal activity are controlled by structures that formed to accommodate an overall E-W gradient in the magnitude of

Klaus Gessner; Alok Porwal; Vanessa Markwitz; Francis Wedin

2010-01-01

72

NATURE AND ORIGTN OF ORTHOPYROXENE MEGACRYSTS FROM THE ST-URBAIN ANORTHOSITE MASSIF. OUEBEC  

Microsoft Academic Search

Al-rich orthopyroxene megacrysrs (OPM) in the St- Urbain (Quebec) massif are found in three distinct field associations (euconorite, anorthosite and anorthositic veinlets); the presence ofplagioclase inclusions in OPM and local development of subophitic textures require cocrystallization of OPM and plagioclase. OPM have 0.66 < Mel(Mg + F\\

ROBERT F. DYMEK; L. PETER GROMET

73

Uranium, thorium and potassium in granulite facies rocks, Bohemian Massif, Lower Austria, Austria  

Microsoft Academic Search

Summary The granulite facies rocks of the Lower Austrian Moldanubian Zone of the Bohemian Massif were formed under conditions of the earth's lower crust. The U contents lie below 0.4 ppm. The rocks are also characterized by low Th contents (<3 ppm), although in some cases Th is higher in biotite-rich layers of banded granulites, which could be explained as

H. G. Scharbert; J. Korkisch; Ilse Steffan

1976-01-01

74

First palaeomagnetic results from the Cycladic Massif, Greece, and their implications for Miocene extension directions and tectonic models in the Aegean  

NASA Astrophysics Data System (ADS)

The Aegean region is characterised by major fault-bound blocks with markedly contrasting structural trends. Recent models account for these variations either through differential block rotation or through a process of radial extension. The Cycladic Massif in the back-arc region to the Hellenic trench represents a critical area where apparently divergent extension directions are observed. This contribution provides the first palaeomagnetic results from this area. Magnetic remanence and AMS data are presented for Middle Miocene granodiorites on the islands of Mykonos and Naxos. These rocks are exposed in the footwalls of major extensional detachments within the metamorphic core complexes that characterise the Cycladic Massif. A clear correlation between the orientation of an L-S fabric developed within the intrusions and the magnetic fabric data is observed, demonstrating the presence of a `normal' magnetic fabric of extensional origin. The mean extension directions inferred from the orientations of the maximum axes of the magnetic susceptibility ellipsoids are markedly divergent at 064° (Mykonos) and 351° (Naxos). Northeasterly in situ magnetic remanences are observed on Mykonos, whereas those on Naxos are directed to the NNW. Neither direction corresponds to the appropriate palaeomagnetic reference direction for the Miocene. Standard palaeomagnetic tilt corrections cannot be applied at these sites because of the lack of palaeohorizontal markers. Deviations of in situ remanences away from the reference direction are potentially due to rotation around any one of an infinite number of net tectonic rotation axes. Each of these may be arbitrarily decomposed into components of tilting and vertical axis rotation. Geologically realistic solutions which restore the in situ magnetisations back to the reference direction may be found by consideration of regional structural trends, assuming that tilting is controlled by the major block-bounding faults. These solutions indicate significant components of differential vertical axis rotations across the Cyclades. Mykonos is bound by NW-SE trending regional faults and is shown to have rotated clockwise by ca. 22°. In contrast, Naxos is bound by ENE-WSW trending structures and has rotated anticlockwise by ca. 33°. The apparent divergence of extension directions inferred from both the magnetic anisotropy and structural data is resolved by correcting the mean AMS data for subsequent rotation using the rotation solutions derived from the magnetic remanence data. The data imply that the primary Middle Miocene extension direction in the Cycladic Massif was nearly uniform along a NNE-SSW azimuth. We consider that the uniform extension direction and opposing senses of block rotation determined for this portion of the Cycladic massif are most consistent with a recent model describing deformation within the Aegean in terms of a system of broken, fault-bounded slats. Within this scenario, Mykonos occupies a position on a clockwise rotating slat which continues northwest, at least as far as Evvia. A major ENE-WSW trending fault between the islands, previously identified on shallow seismic sections, separates this domain from an anticlockwise rotating slat which includes Naxos.

Morris, Antony; Anderson, Mark

1996-08-01

75

Radiometric age determinations and their interpretations phenomena in the Menderes Massif (western Anatolia-Turkey)  

NASA Astrophysics Data System (ADS)

Radiometric isotope applications in geosciences have been enormously improving during the last decade. Most of these applications were also performed in the entire Turkey by various researchers. From southern to northern part of the Menderes Massif (western Anatolia), 40Ar-39Ar mica; Rb-Sr whole rock, mica; K-Ar whole rock, mica; U-Pb zircon isotope dilution; 207Pb-206Pb single zircon evaporation; apatite, zircon fission tracks, and Th-Pb monazite techniques are commonly applied methods. Most of the age determinations and their interpretations in the Menderes Massif were or are still used to evidence the geodynamic nature of the region with its bordered paleogeography. Last 20 years, nearly, most of the age data in the massif conflict with the well-known stratigraphical and lithological features and still preserve its debate. Moreover, individual age techniques were not properly interpreted or performed within their parameters (closure temperatures, related mineral equilibrium, metamorphic conditions…etc.). Particularly, most popular age determination methods of 40Ar/39Ar mistakenly interpreted as cooling ages instead of neo-crystallization ages. Similarly, Rb-Sr mica ages could easily demonstrate open chemical behavior related to the fluid interactions and present the timing of last fluid circulation events instead of cooling ages. The age data obtained from massif were interpreted without any consideration of the widespread Oligo-Miocene magmatic activity in the northern Menderes Massif, Neogene volcanism, and graben structures in western Anatolia. This study aims to present and summarize new (U-Pb-ID, 207Pb-206Pb single zircon evaporation, Rb-Sr mica) and previously obtained age data from northern and southern Menderes Massif in comparison with literature to better understanding of the age interpretations within their geological limits and related mineral features. Our results in comparison with previously published age data in their detailed stratigraphical features indicate that obtained youngest ages (c.20-25 Ma), which were previously interpreted as the cooling of the massif, are still questionable, and they are more likely representing the timing of fluid circulation events and/or resetting of their related isotopic systems.

Erdogan, B.; Hasozbek, A.; Akay, E.; Gungor, T.; Satir, M.; Siebel, W.

2012-04-01

76

PGE mineralization of dunite-wehrlite massifs at the Gutara-Uda interfluve, Eastern Sayan  

NASA Astrophysics Data System (ADS)

The Pt-Pd and Au-Ag mineralization hosted in both wehrlite without visible links to sulfide mineralization (dispersed assemblage of the Tartai massif) and disseminated Cu-Ni sulfide ore (ore assemblage of the Ognit massif) was found in dunite-wehrlite massifs localized in the fold framework of the Siberian Craton. The Pt minerals in both assemblages comprise sperrylite (PtAs2) and secondary Pt-Fe-Ni alloys in the Ognit massif and Pt-Fe-Cu and Pt-Cu alloys in the Tartai massif. The Pd minerals are widespread in the ore assemblages as compounds with Te, Sb, and Bi, whereas in the dispersed assemblage Pd is concentrated primarily in Pd-Cu-Sb compounds. Both assemblages are characterized by similar substitution of sperrylite with orcelite (Ni5 - xAs2) and then with secondary Pt-Fe-Ni or Pt-Fe-Cu and Pt-Cu alloys; the occurrence of Au-Ag alloys with prevalence of Ag over Au; and replacement of them with auricupride (Cu3Au) at the late stage. Sperrylite in both assemblages contains Ir impurities, while the Pd minerals contain Cu and Ni admixtures, which are typical of mineral assemblages related to the ultramafic intrusions with nickel specialization. PGM were formed under a low sulfur fugacity and high As, Bi, and Sb activities. The postmagmatic fluids affected the primary mineral assemblages under reductive conditions, and this effect resulted in replacement of sperrylite with Ni arsenide (orcelite) and Pt-Fe-Ni and Pt-Fe-Cu alloys; Ni and Cu sulfides were replaced with awaruite and native copper.

Mekhonoshin, A. S.; Tolstykh, N. D.; Podlipsky, M. Yu.; Kolotilina, T. B.; Vishnevsky, A. V.; Benedyuk, Yu. P.

2013-05-01

77

Detachment shear zone of the Atlantis Massif core complex, Mid-Atlantic Ridge, 30°N  

NASA Astrophysics Data System (ADS)

Near-bottom investigations of the cross section of the Atlantis Massif exposed in a major tectonic escarpment provide an unprecedented view of the internal structure of the footwall domain of this oceanic core complex. Integrated direct observations, sampling, photogeology, and imaging define a mylonitic, low-angle detachment shear zone (DSZ) along the crest of the massif. The shear zone may project beneath the nearby, corrugated upper surface of the massif. The DSZ and related structures are inferred to be responsible for the unroofing of upper mantle peridotites and lower crustal gabbroic rocks by extreme, localized tectonic extension during seafloor spreading over the past 2 m.y. The DSZ is characterized by strongly foliated to mylonitic serpentinites and talc-amphibole schists. It is about 100 m thick and can be traced continuously for at least 3 km in the tectonic transport direction. The DSZ foliation arches over the top of the massif in a convex-upward trajectory mimicking the morphology of the top of the massif. Kinematic indicators show consistent top-to-east (toward the MAR axis) tectonic transport directions. Foliated DSZ rocks grade structurally downward into more massive basement rocks that lack a pervasive outcrop-scale foliation. The DSZ and underlying basement rocks are cut by discrete, anastomosing, normal-slip, shear zones. Widely spaced, steeply dipping, normal faults cut all the older structures and localize serpentinization-driven hydrothermal outflow at the Lost City Hydrothermal Field. A thin (few meters) sequence of sedimentary breccias grading upward into pelagic limestones directly overlies the DSZ and may record a history of progressive rotation of the shear zone from a moderately dipping attitude into its present, gently dipping orientation during lateral spreading and uplift.

Karson, J. A.; Früh-Green, G. L.; Kelley, D. S.; Williams, E. A.; Yoerger, D. R.; Jakuba, M.

2006-06-01

78

Geology of the epithermal Ag-Au Huevos Verdes vein system and San José district, Deseado massif, Patagonia, Argentina  

NASA Astrophysics Data System (ADS)

The San José district is located in the northwest part of the Deseado massif and hosts a number of epithermal Ag-Au quartz veins of intermediate sulfidation style, including the Huevos Verdes vein system. Veins are hosted by andesitic rocks of the Bajo Pobre Formation and locally by rhyodacitic pyroclastic rocks of the Chon Aike Formation. New 40Ar/39Ar constraints on the age of host rocks and mineralization define Late Jurassic ages of 151.3 ± 0.7 Ma to 144.7 ± 0.1 Ma for volcanic rocks of the Bajo Pobre Formation and of 147.6 ± 1.1 Ma for the Chon Aike Formation. Illite ages of the Huevos Verdes vein system of 140.8 ± 0.2 and 140.5 ± 0.3 Ma are 4 m.y. younger than the volcanic host rock unit. These age dates are among the youngest reported for Jurassic volcanism in the Deseado massif and correlate well with the regional context of magmatic and hydrothermal activity. The Huevos Verdes vein system has a strike length of 2,000 m, with several ore shoots along strike. The vein consists of a pre-ore stage and three main ore stages. Early barren quartz and chalcedony are followed by a mottled quartz stage of coarse saccharoidal quartz with irregular streaks and discontinuous bands of sulfide-rich material. The banded quartz-sulfide stage consists of sulfide-rich bands alternating with bands of quartz and bands of chlorite ± illite. Late-stage sulfide-rich veinlets are associated with kaolinite gangue. Ore minerals are argentite and electrum, together with pyrite, sphalerite, galena, chalcopyrite, minor bornite, covellite, and ruby silver. Wall rock alteration is characterized by narrow (< 3 m) halos of illite and illite/smectite next to veins, grading outward into propylitic alteration. Gangue minerals are dominantly massive quartz intergrown with minor to accessory adularia. Epidote, illite, illite/smectite, and, preferentially at deeper levels, Fe-chlorite gangue indicate near-neutral pH hydrothermal fluids at temperatures of >220°C. Kaolinite occurring with the late sulfide-rich veinlet stage indicates pH < 4 and a temperature of <200°C. The Huevos Verdes system has an overall strike of 325°, dipping on average 65° NE. The orientations of individual ore shoots are controlled by vein strike and intersecting north-northwest-striking faults. We propose a structural model for the time of mineralization of the San José district, consisting of a conjugate shear pair of sinistral north-northwest- and dextral west-northwest-striking faults that correspond to R and R' in the Riedel shear model and that are related to master faults (M) of north-northeast-strike. Veins of 315° strike can be interpreted as nearly pure extensional fractures (T). Variations in vein strike predict an induced sinistral shear component for strike directions of >315°, whereas strike directions of <315° are predicted with an induced dextral strike-slip movement. The components of the structural model appear to be present on a regional scale and are not restricted to the San José district.

Dietrich, Andreas; Gutierrez, Ronald; Nelson, Eric P.; Layer, Paul W.

2011-05-01

79

Geology of the epithermal Ag-Au Huevos Verdes vein system and San José district, Deseado massif, Patagonia, Argentina  

NASA Astrophysics Data System (ADS)

The San José district is located in the northwest part of the Deseado massif and hosts a number of epithermal Ag-Au quartz veins of intermediate sulfidation style, including the Huevos Verdes vein system. Veins are hosted by andesitic rocks of the Bajo Pobre Formation and locally by rhyodacitic pyroclastic rocks of the Chon Aike Formation. New 40Ar/39Ar constraints on the age of host rocks and mineralization define Late Jurassic ages of 151.3 ± 0.7 Ma to 144.7 ± 0.1 Ma for volcanic rocks of the Bajo Pobre Formation and of 147.6 ± 1.1 Ma for the Chon Aike Formation. Illite ages of the Huevos Verdes vein system of 140.8 ± 0.2 and 140.5 ± 0.3 Ma are 4 m.y. younger than the volcanic host rock unit. These age dates are among the youngest reported for Jurassic volcanism in the Deseado massif and correlate well with the regional context of magmatic and hydrothermal activity. The Huevos Verdes vein system has a strike length of 2,000 m, with several ore shoots along strike. The vein consists of a pre-ore stage and three main ore stages. Early barren quartz and chalcedony are followed by a mottled quartz stage of coarse saccharoidal quartz with irregular streaks and discontinuous bands of sulfide-rich material. The banded quartz-sulfide stage consists of sulfide-rich bands alternating with bands of quartz and bands of chlorite ± illite. Late-stage sulfide-rich veinlets are associated with kaolinite gangue. Ore minerals are argentite and electrum, together with pyrite, sphalerite, galena, chalcopyrite, minor bornite, covellite, and ruby silver. Wall rock alteration is characterized by narrow (< 3 m) halos of illite and illite/smectite next to veins, grading outward into propylitic alteration. Gangue minerals are dominantly massive quartz intergrown with minor to accessory adularia. Epidote, illite, illite/smectite, and, preferentially at deeper levels, Fe-chlorite gangue indicate near-neutral pH hydrothermal fluids at temperatures of >220°C. Kaolinite occurring with the late sulfide-rich veinlet stage indicates pH < 4 and a temperature of <200°C. The Huevos Verdes system has an overall strike of 325°, dipping on average 65° NE. The orientations of individual ore shoots are controlled by vein strike and intersecting north-northwest-striking faults. We propose a structural model for the time of mineralization of the San José district, consisting of a conjugate shear pair of sinistral north-northwest- and dextral west-northwest-striking faults that correspond to R and R' in the Riedel shear model and that are related to master faults (M) of north-northeast-strike. Veins of 315° strike can be interpreted as nearly pure extensional fractures (T). Variations in vein strike predict an induced sinistral shear component for strike directions of >315°, whereas strike directions of <315° are predicted with an induced dextral strike-slip movement. The components of the structural model appear to be present on a regional scale and are not restricted to the San José district.

Dietrich, Andreas; Gutierrez, Ronald; Nelson, Eric P.; Layer, Paul W.

2012-03-01

80

Geological setting and petrogenesis of symmetrically zoned, miarolitic granitic pegmatites at Stak Nala, Nanga Parbat - Haramosh Massif, northern Pakistan  

USGS Publications Warehouse

Miarolitic granitic pegmatites in the Stak valley in the northeast part of the Nanga Parbat - Haramosh Massif, in northern Pakistan, locally contain economic quantities of bi- and tricolored tourmaline. The pegmatites form flat-lying sills that range from less than 1 m to more than 3 m thick and show symmetrical internal zonation. A narrow outer or border zone of medium-to coarse-grained oligoclase - K-feldspar - quartz grades inward to a very coarse-grained wall zone characterized by K-feldspar - oligoclase - quartz - schorl tourmaline. Radiating sprays of schorl and flaring megacrysts of K-feldspar (intermediate microcline) point inward, indicating progressive crystallization toward the core. The core zone consists of variable mixtures of blocky K-feldspar (intermediate microcline), oligoclase, quartz, and sparse schorl or elbaite, with local bodies of sodic aplite and miarolitic cavities or "pockets". Minor spessartine-almandine garnet and lo??llingite are disseminated throughout the pegmatite, but were not observed in the pockets. The pockets contain well-formed crystals of albite, quartz, K-feldspar (maximum microcline ?? orthoclase overgrowths), schorl-elbaite tourmaline, muscovite or lepidolite, topaz, and small amounts of other minerals. Elbaite is color-zoned from core to rim: green (Fe2+- and Mn2+-bearing), colorless (Mn2+-bearing), and light pink (trace Mn3+). Within ???10 cm of the pegmatites, the granitic gneiss wallrock is bleached owing to conversion of biotite to muscovite, with local quartz and albite added. Schorl is disseminated through the altered gneiss, and veins of schorl with bleached selvages locally traverse the wallrock up to 1 m from the pegmatite contact. The schorl veins can be traced into the outer part of the wall zone, which suggests that they formed from aqueous fluids derived during early saturation of the pegmatite-forming leucogranitic magma rich in H2O, F, B, and Li. Progressive crystallization resulted in a late-stage sodic magma and abundant aqueous fluids. Two late stages of volatile escape are recognized: the first stage caused pressure-quenching of the last magma, which produced aplite and caused albitization (An3 to An8) of earlier crystallized K-feldspar and oligoclase. The second stage, released during the rupture of miarolitic cavities, produced platy albite ("cleavelandite," An1) locally associated with F-rich moscovite and elbaite. Albitization is likely due to cooling of alkali-fluoride-dominated fluids at less than 2 kbar pressure. The pegmatites are derived from Himalayan leucogranitic magma emplaced prior to 5 Ma into granulitic gneiss that was at 300?? to 550??C and 1.5 to 2 kbar. The pegmatites were emplaced during uplift of the Haramosh Massif, since they cross-cut ductile normal faults but are cut by brittle normal faults. Economically important pink tourmaline mineralization formed in pockets concentrated near the crest of a broad antiform, as a result of trapping of late magmatic aqueous fluids that had become Fe-poor owing to the prior crystallization of schorl.

Laurs, B. M.; Dilles, J. H.; Wairrach, Y.; Kausar, A. B.; Snee, L. W.

1998-01-01

81

Episodic deformation within the Twin Sisters ultramafic massif, Washington  

NASA Astrophysics Data System (ADS)

A tectonic history punctuated by distinct pulses of deformation is revealed through detailed mapping and microstructural observations in the central portion of the Twin Sisters ultramafic massif, western Washington. Folded and elongated orthopyroxenite dikes occur in a banded dunite/harzburgite host. Compositional banding is parallel to a high temperature (~1000oC) foliation defined by shape-preferred orientation of elongate chromite and orthopyroxenite grains. Dunites and harzburgites have a bimodal grainsize distribution, dominated by coarse (3-5 mm) olivine grains with finer grains (~1 mm) developed locally along grain boundaries and at triple junctions. Analysis of the distribution, shape and 3-d geometry of the orthopyroxenite dikes, mapped using a laser surveying station at cm-scale accuracy, indicates that the axial planes of the folds are generally parallel to the high-temperature foliation in the host peridotite, while fold hinges are strongly girdled within this axial plane. Fold limbs that strike parallel to the high-temperature host rock foliation are ductilely thinned, or, rarely, boudinaged, with respect to folded portions of the dike. Microstructural observations from one orthopyroxenite dike and the adjacent host dunite vary from limb to hinge. Orthopyroxene grains (5-10 mm) from the hinge area exhibit kinked cleavage planes, minor undulose extinction, subgrain development and new grains (0.1 mm). Analysis using electron backscattered diffraction indicates no crystallographic preferred orientation (CPO) in orthopyroxene grains from the hinge. Orthopyroxene grains (5-10 mm) in the limb contain sweeping undulose extinction, deformation bands, bent cleavage planes, subgrain development, and a higher percentage (~10%) of fine grains (0.1-0.3 mm) than in the hinge area. Coarse orthopyroxene grains from the limb yield a CPO. Olivine grains in the dunite adjacent to the folded dike have a trimodal grainsize distribution; the coarse and intermediate grainsizes are similar to the host peridotite away from the folded dike. The proportion of the finest grainsize (~0.5 mm) population varies from limb to hinge, with a higher percentage observed in samples adjacent to the limb of the fold. These CPO data and microstructural observations suggest higher strains in the limbs of the fold than in the hinge area. These meso- and microscale observations suggest an early stage of deformation that resulted in the high-temperature foliation that is parallel to the harzburgite/dunite banding. The banded and foliated dunites and harzburgites were intruded by orthopyroxenite dikes, under conditions of hydrostatic or very low stresses, resulting in random orientations of the dikes. The dikes crystallized under these low stress conditions, resulting in the lack of CPO that is now preserved in the hinge area of the dike. A second pulse of deformation, parallel to the earlier deformation, resulted in folding and elongation of the dikes. This two-pulse model explains the observation of the axial planes parallel to the earlier high temperature fabric.

Rodriguez, A. L.; Newman, J.; Tikoff, B.

2009-12-01

82

Timing of Variscan HP-HT metamorphism in the Moldanubian Zone of the Bohemian Massif: UPb SHRIMP dating on multiply zoned zircons from a granulite from the Dunkelsteiner Wald Massif, Lower Austria  

Microsoft Academic Search

In an attempt to better constrain the timing of Variscan HP-HT metamorphism in the SE Bohemian Massif we have dated zoned\\u000a zircons from a garnet-kyanite granulite of granitic composition from the Dunkelsteiner Wald Massif, Lower Austria, by means\\u000a of sensitive high-resolution ion microprobe (SHRIMP) technique. In order to combine isotopic information with crystal growth\\u000a textures, CL and BSE images were

Gertrude Friedl; Rob A. Cooke; Friedrich Finger; Neal J. McNaughton; Ian R. Fletcher

83

The magmatic record in the Arghash region (northeast Iran) and tectonic implications  

NASA Astrophysics Data System (ADS)

The area of Arghash in northeast Iran, prominent for its gold mineralization, was newly mapped on a scale of 1:20,000 with particular attention to the occurring generations of igneous rocks. In addition, geochronological and geochemical investigations were carried out. The oldest geological unit is a late Precambrian, hornblende-bearing diorite pluton with low-K composition and primitive isotope signatures. This diorite (U-Pb zircon age 554 ± 6 Ma) is most likely a remnant from a Peri-Gondwana island-arc or back-arc basin. About one-third of the map area is interpreted as an Upper Cretaceous magmatic arc consisting of a volcanic and a plutonic part. The plutonic part is represented by a suite of hornblende-bearing medium-K, I-type granitoids (minor diorite, mainly quartz-monzodiorite and granodiorite) dated at 92.8 ± 1.3 Ma (U-Pb zircon age). The volcanic part comprises medium-K andesite, dacite and tuffitic rocks and must be at least slightly older, because it is locally affected by contact metamorphism through the hornblende-granitoids. The Upper Cretaceous arc magmatism in the Arghash Massif is probably related to the northward subduction of the Sabzevar oceanic basin, which holds a back-arc position behind the main Neotethys subduction front. Small occurrences of pillow basalts and sediments (sandstone, conglomerate, limestone) tectonically intercalated in the older volcanic series may be relics of earlier Cretaceous or even pre-Cretaceous rocks. In the early Cenozoic, the Cretaceous magmatic arc was intruded by bodies of felsic, weakly peraluminous granite (U-Pb zircon age 55.4 ± 2.3 Ma). Another strong pulse of magmatism followed slightly later in the Eocene, producing large masses of andesitic to dacitic volcanic rocks. The geochemistry of this prominent Eocene volcanism is very distinct, with a high-K signature and trace element contents similar to shoshonitic series (high P, Zr, Cr, Sr and Ba). High Sr/Y ratios feature affinities to adakite magmas. The Eocene magmatism in the Arghash Massif is interpreted as related to thermal anomalies in crust and mantle that developed when the Sabzevar subduction system collapsed. The youngest magmatic activities in the Arghash Massif are lamprophyres and small intrusions of quartz-monzodiorite porphyries, which cut through all other rocks including an Oligocene-Miocene conglomerate cover series.

Alaminia, Zahra; Karimpour, Mohammad Hassan; Homam, Seyed Massoud; Finger, Fritz

2013-04-01

84

Integrating lawsonite bearing eclogite and blueschist into the structural evolution of the Sivrihisar massif  

NASA Astrophysics Data System (ADS)

Lawsonite eclogite and blueschist-facies rocks occur in contact with metasedimentary host rocks in the Sivrihisar massif, part of the Tavsanli Zone of western Turkey, provide new context to the Neo-Tethyan subduction and exhumation processes that occurred prior to and exhumation that occured during the Cretaceous Anatolide continental collision and basin closure. The Sivrihisar massif is comprised of four WNW-ESE striking belts dominated by metasedimentary schist and marble with lesser amounts of metabasalt that have a bulk composition equivalent to NMORB. Metabasalts in three of the four belts record decreasing maximum pressure conditions (P-max) from ~ 26 kbar from lawsonite eclogite and ~ 18 kbar from epidote eclogite in the northern most Halilbagi belt, 15-16 kbar from lawsonite-epidote blueschist in the central Karacaoren belt, and 8-12 kbar from incipient blueschist facies on epidote + chlorite greenschist facies metabasalt in the Kertek belt to the south. Most rocks contain a pervasive foliation, (S1) parallel to compositional layering (S0), and mineral lineations (stretched and/or aligned) composed of minerals such as quartz, omphacite, sodic-amphibole, lawsonite, pressure shadows on garnet and lawsonite. Inclusions trails in garnet and lawsonite suggest that S0/S1 is a composite fabric that records pre- to post P-max in the Halilbagi and Karacaoren belts. S0/S1 predates incipient blueschist in the Kertek belt. Folds (F2) of S0/S1 are typically asymmetric and tight to isoclinal. F2 folds are south-vergent and moderately easterly plunging in the Halilbagi and northern portion of the Karacaoren belts. F2 axes become more horizontal from north to south across the Karacaoren belt. F2’s are recumbent in the Kertek belt. F3 folds are consistently upright open to closed with NNW plunging axes across the massif. Fibrous calcite, interpreted to be pseudomorph after aragonite, occurs parallel to F3 fold axes across the massif. Shear sense indicators from field observations and asymmetric type-I cross girdle of quartz c-axes obtained from electron backscatter diffraction (EBSD) show top to the south thrusting for much of the massif with the exception of the far northern margin. The Halilbagi belt was thrust onto the Karacaoren belt possibly below a depth of 45 km during extrusion along the subduction channel. Exhumation from this structural level may have coincided with the arrival of the Anatolide micro-continent into the subduction zone at approximately 70 Ma. The homogeneous orientation of calcite fibers and F3’s across the Massif suggests that assembly occurred at blueschist conditions before exhumation through the aragonite-calcite transition ~ 350 degrees C above 8 kbar.

Davis, P. B.

2009-12-01

85

Emplacement of Proterozoic massif-type anorthosite during regional shortening: evidence from the Bolangir anorthosite complex (Eastern Ghats Province, India)  

Microsoft Academic Search

A study of the 933±32-Ma-old Bolangir massif-type anorthosite complex (Eastern Ghats Province, India) yielded strong evidence for anorthosite emplacement during regional shortening, and thereby new insights in massif-type anorthosite formation. Several lines of evidence strongly suggest synchronism of plutonism and regional deformation. First, structures in the country rocks, which imply N–S-directed shortening accompanied by E–W extension, are mirrored by a

Christoph Dobmeier

2006-01-01

86

Institutionalizing Northeast Asia: Challenges and Opportunities  

Microsoft Academic Search

With North Korea going nuclear, tensions ever present in the Taiwan Strait, and growing posturing over territories thought to be rich in resources, the question of how lasting peace, order, stability and prosperity can be achieved in Northeast Asia has become increasingly important. Globalisation and China’s galloping economy have caused radically different economic growth rates in Northeast Asia, resulting in

Martina Timmermann

2008-01-01

87

Significance of the Early Jurassic Garamilla formation in the western Nordpatagonian Massif  

NASA Astrophysics Data System (ADS)

By means of facial, stratigraphic, petrographic, geochemical and geochronological studies we characterize the Garamilla Formation, cropping out in the western Nordpatagonian Massif.The studies of these volcanic rocks reveal an Early Jurassic volcanic episode formed by three volcanic units that change from normal calc-alkaline to high-K calc-alkaline series. Other geochemical features reveal a progressive change from an initial subduction-related volcanism to one intraplate-related volcanism.This volcanic episode is temporally and geochemically equivalent to those volcanic units located in half-grabens in several areas of the Neuquén Basin.The volcanic units were erupted into different structural designs. A portion of its depocenter was interpreted as a transtensional half-graben, whereas the other exhibits a trapdoor structure. The lineament trends that bound the volcanic system were also recognized in western Nordpatagonian Massif, and were assigned to the Gondwanide Orogeny.

Benedini, Leonardo; Gregori, Daniel

2013-08-01

88

Geological mapping of the Rainbow Massif, Mid-Atlantic Ridge, 36°14'N  

Microsoft Academic Search

The Rainbow hydrothermal field at 36°14'N on the Mid-Atlantic Ridge is one of the few known sites hosted in ultramafic basement. The Rainbow Massif is located along the non-transform offset between the AMAR and South AMAR second-order ridge segments, and presents the characteristic dome morphology of oceanic core complexes, although no corrugated surface has been observed so far. One of

B. Ildefonse; Y. Fouquet; E. Hoisé; J. Dyment; P. Gente; R. Thibaud; D. Bissessur; V. Yatheesh

2008-01-01

89

Deep-mantle-derived noble gases in metamorphic diamonds from the Kokchetav massif, Kazakhstan  

Microsoft Academic Search

Metamorphic diamonds from the Kokchetav massif in northern Kazakhstan are considered to have crystallized from a C–O–H fluid during ultra-high-pressure metamorphism of metasedimentary rocks subducted to 190–280km depth. Noble gases contained in the diamonds offer great potential to constrain the noble gas state of deep mantle reservoirs. Previous studies have revealed that secondary processes during the diamond residence in the

H. Sumino; L. F. Dobrzhinetskaya; R. Burgess; H. Kagi

2011-01-01

90

Mapping seismic anisotropy of lithospheric mantle beneath the Bohemian Massif (central Europe)  

Microsoft Academic Search

Olivine lattice-preferred orientation (LPO) creates fabrics observed by different methods in the Earth mantle. Our study of seismic anisotropy of the upper mantle beneath the Bohemian Massif is based on broad-band data from several passive experiments conducted in central Europe since the 90ties (Exp92- Plomerova et al., PAGEOPH 1998, MOSAIC- Plomerova et al., Studia Geoph. Geod. 2005, BOHEMA I-III, Babuska

Jaroslava Plomerova; V. Babuska; L. Vecsey

2010-01-01

91

Mapping seismic anisotropy of the lithospheric mantle beneath the northern and eastern Bohemian Massif (central Europe)  

Microsoft Academic Search

We evaluate 3D body-wave anisotropic parameters—shear-wave splitting (fast S polarizations and delay times of the split slow shear waves) and directional terms of relative P-wave residuals from data of passive seismic experiment BOHEMA II (2004–2005). Data from 34 temporary stations increased substantial density of observations in the Bohemain Massif (BM) and allowed us to scan in detail the upper mantle

Jaroslava Plomerová; Lud?k Vecsey; Vladislav Babuška

92

Ultrarapid exhumation of ultrahigh-pressure diamond-bearing metasedimentary rocks of the Kokchetav Massif, Kazakhstan?  

Microsoft Academic Search

The diamond-bearing, ultrahigh-pressure Kokchetav Massif recrystallized at eclogite-facies conditions deep in the mantle at 180-km depth at 535±3 Ma, and yet new 40Ar\\/39Ar ages suggest that it may have been exhumed to crustal depths (as indicated by closure of mica to Ar loss) by ?529 Ma. These data indicate a possible exhumation rate of tens of kilometers per million years,

Bradley R. Hacker; Andrew Calvert; R. Y. Zhang; W. Gary Ernst; J. G. Liou

2003-01-01

93

Geochemistry and age of ultrahigh pressure metamorphic rocks from the Kokchetav massif (Northern Kazakhstan)  

Microsoft Academic Search

Isotopic and geochemical data of the Zerenda series metamorphic rocks from the Kokchetav massif are reported. Some of these\\u000a rocks contain microdiamond inclusions in garnets and other indicators of ultrahigh pressure metamorphism (P?>?40?kbar, T?=?900–1000?C). The diamond-bearing rocks exhibit distinctive geochemical characteristics compared to typical crustal rocks.\\u000a The REE patterns range from LREE depleted to slightly LREE enriched [chondrite normalized (La\\/Yb)N–

V. S. Shatsky; E. Jagoutz; N. V. Sobolev; O. A. Kozmenko; V. S. Parkhomenko; M. Troesch

1999-01-01

94

Seismic image of the ice–bedrock contact at the Lobbia glacier, Adamello Massif, Italy  

Microsoft Academic Search

In the framework of a geophysical study to investigate the ice thickness on the Lobbia Glacier located in the Adamello Massif, Italy, we used multifold seismic data to constrain a joint gravity survey covering an area of about 3.7 km2. Two seismic lines were recorded above the maximum ice thickness as estimated from single-fold seismic data and gravity data collected

L. Levato; L Veronese; A Lozej; E Tabacco

1999-01-01

95

Post-Hercynian subvolcanic magmatism in the Serre Massif (Central-Southern Calabria, Italy)  

Microsoft Academic Search

In the Serre Massif (Central-Southern Calabria, Italy) dykes and subvolcanic bodies intrude diffusively both Hercynian metamorphic rocks and late-Hercynian granitoids. They range in composition from basaltic andesites to dacite-rhyodacites and can be ascribed to the extensive magmatic activity that affects the entire Hercynian orogenic belt in late Paleozoic - early Mesozoic time. The geodinamic framework of the magmatic activity is

V. Romano; R. Cirrincione; P. Fiannacca; P. Mazzoleni; A. Tranchina

2009-01-01

96

Extensional and compressional faults in the Everest Lhotse massif, Khumbu Himalaya, Nepal  

Microsoft Academic Search

Two large-scale north-dipping, low-angle normal faults cut the Everest massif at the top of the High Himalayan slab in Nepal. The upper fault the Qomolangma Detachment, follows the north slope of Everest from above the 'Yellow Band' at c. 8500 m on the Southwest Face down to the Rongbuk glacier. On the south side of Everest this fault places unmetamorphosed

M. P. SEARLE

1999-01-01

97

Inclusions in chrysolite from the Kovdor Massif: Genetic and gemmological significance  

Microsoft Academic Search

Gem-quality chrysolite (peridot) from a phlogopite deposit related to the Kovdor ultrabasic-alkaline massif in the Kola Peninsula,\\u000a Russia, was studied using a variety of techniques (optical mineralogical microscopy, chemical, Mössbauer spectroscopy, and\\u000a photoluminescence) to determine its chemical composition, the Fe2+\\/Fe3+ ratio, refraction indexes, density, as well as to examine inclusions in it. Much attention was devoted to the microprobe\\u000a identification

S. V. Sokolov; S. A. Yarmishko; N. I. Chistyakova

2006-01-01

98

Natural annealing of dynamically recrystallised quartzite fabrics: Example from the Cévennes, SE French Massif Central  

Microsoft Academic Search

Quartzite samples from the SW-Cévennes (French Massif Central) have been investigated in order to reveal the effects of annealing on a previously dynamically recrystallised quartz fabric. The studied quartzite is interlayered with turbiditic micaschist series, and after regional deformation the whole sequence was intruded by the St-Guiral granodiorite at 1–3 kbar and up to 650–700 °C. Recorded crystallographic preferred orientation (CPO) patterns

Clemens Augenstein; Jean-Pierre Burg

2011-01-01

99

Geological mapping of the Rainbow Massif, Mid-Atlantic Ridge, 36°14'N  

NASA Astrophysics Data System (ADS)

The Rainbow hydrothermal field at 36°14'N on the Mid-Atlantic Ridge is one of the few known sites hosted in ultramafic basement. The Rainbow Massif is located along the non-transform offset between the AMAR and South AMAR second-order ridge segments, and presents the characteristic dome morphology of oceanic core complexes, although no corrugated surface has been observed so far. One of the objectives of Cruises MOMAR DREAM (July 2007, R/V Pourquoi Pas ?; Aug-Sept 2008, R/V Atalante) was to study the petrological and structural context of the hydrothermal system at the scale of the Rainbow Massif. Our geological sampling complements previous ones achieved during Cruises FLORES (1997) and IRIS (2001), and consisted in dredge hauls, and submersible dives by manned submersible Nautile and ROV Victor. The tectonics of the Rainbow Massif is dominated by a N-S trending fault pattern on the western flank of the massif, and a series of SW-NW ridges on its northeastern side. The active hydrothermal site is located in the area were these two systems crosscut. The most abundant recovered rock type is peridotite (harzburgite and dunite) that presents a variety of serpentinization styles and intensity, and a variety of deformation styles (commonly undeformed, sometimes displaying ductile or brittle foliations). Serpentinites are frequently oxidized. Some peridotite samples have melt impregnation textures. Massive chromitite was recovered in one dredge haul. Variously evolved gabbroic rocks were collected as discrete samples or as centimeter to decimeter-thick dikes in peridotites. Basalts and fresh basaltic glass were also sampled in talus and sediments on the southwestern and northeastern flanks of the massif. Our sampling is consistent with the lithological variability encountered in oceanic core complexes along the Mid-Atlantic Ridge and Southwest Indian Ridge. The stockwork of the hydrothermal system has been sampled on the western side of the present-day hydrothermal field, along N-S trending normal fault scarps, and within the talus underneath. It is made of massive sulfides, strongly altered serpentinites, and breccias containing elements of iron sulfide/oxide impregnated serpentinites. * K. Bukas, V. Cueff Gauchard, L. Durand, F. Gaill, C. Konn, F. Lartaud, N. Le Bris, G. Musset, A. Nunes, J. Renard, V. Riou, A. Tasiemski, P. Torres, I. Vojdani, M. Zbinden

Ildefonse, B.; Fouquet, Y.; Hoisé, E.; Dyment, J.; Gente, P.; Thibaud, R.; Bissessur, D.; Yatheesh, V.; Momardream 2008 Scientific Party*, T.

2008-12-01

100

Tectonic framework of hydrothermal and geothermal systems in the Menderes Massif, western Turkey  

NASA Astrophysics Data System (ADS)

The Menderes Massif in western Turkey lies at the eastern margin of the Hellenic subduction zone's continental backarc. Substantial hydrothermal alteration and geothermal activity have accompanied Miocene to recent extensional tectonics. Here we propose that the locations of Cenozoic magmatic, hydrothermal and geothermal activity are controlled by structures that formed to accommodate an overall E-W gradient in the magnitude of continental extension. We present data that demonstrate the close spatial relationship between Miocene transtensional deformation, magmatism, tectonic denudation, and the location of mineral deposits and geothermal fields. The Menderes Massif is part of the Tauride block, a distinct lithospheric province within the Alpine orogenic belt in western Turkey. Alpine contraction occurred from Cretaceous to Palaeogene during N - S convergence, including subduction of the Vardar-Izmir and the Pindos oceans and the collision of adjacent continental fragments with the Tauride block. Pre-Alpine basement rocks are predominantly late Proterozoic to Cambrian (‘Pan-African') in age, while basement rocks along strike in the Aegean Sea area are generally of Carboniferous age. While the nature of this boundary between the Pan-African and Carboniferous crustal domains is not clear, a significant difference exists in their geodynamic history. Whereas early in the Miocene the Hellenic subduction zone began to retreat in the Aegean Sea area, this apparently did not happen in western Turkey. Instead there is evidence for a tear in the slab that causes a thermal anomaly in the lithosphere. Miocene to recent extension in the Menderes Massif has led to the formation of metamorphic core complexes, NE-striking basins and a series of large E-W trending graben. These structures accommodate the overall sinistral strike-slip deformation forced by the slab retreat in the Aegean Sea region. The Menderes Massif hosts a variety of hydrothermal mineral deposits, including gold, copper, antimony, uranium and mercury. While there is evidence for gold mineralisation during crustal shortening, most other deposit types including epithermal gold, detachment gold, mercury, and sandstone-hosted uranium formed during the Miocene to recent crustal extension. Alteration of basement rocks and Cenozoic volcanic and sedimentary sequences is common in both fossil hydrothermal systems and geothermal fields. Hydrothermal activity is structurally controlled, and has predominantly occured along structures related to the formation of E-W graben. In addition to the involvement of meteoric fluids a mantle component has been shown. The apparent continuity in tectonic boundary conditions in the Menderes Massif since the Miocene, and the ongoing hydrothermal activity provide important insights into the structural control on hydrothermal mineral systems within or near continental backarcs.

Gessner, Klaus; Porwal, Alok; Markwitz, Vanessa; Wedin, Francis

2010-05-01

101

Problem of Dialogue in Northeast Asia.  

National Technical Information Service (NTIS)

Northeast Asia is one of the most volatile regions on the globe, yet dialogue between and among states in the region is limited by differences in culture, history, language, economic strength, political systems and military strength. This paper develops t...

K. O. Hassig

1999-01-01

102

Cooperative Lamb Slaughtering in the Northeast.  

National Technical Information Service (NTIS)

An analysis of lamb production, marketing, meatpacking, and consumption in the Northeast indicates the need for a lamb processing cooperative. The region currently exports half its lambs for slaughter and then buys them back for consumption. Cooperative l...

D. L. Holder J. A. Hogeland

1982-01-01

103

MARS and its applications at Northeast Utilities  

SciTech Connect

The MAAP Accident Response System (MARS) for Northeast Utilities Millstone Unit 1 (MP-1) has been jointly developed by Northeast Utilities (NU) and Fauske Associates, Inc. (FAI). Millstone Unit 1 is a 2011-MW(thermal) boiling water reactor (BWR)/3 with a Mark-I containment. MARS/MP1 is user-friendly computer software that is structured to provide Northeast Utilities management and engineering staff with key insights during actual or simulated accidents. Times to core uncovery, vessel failure, and containment failure are among the figures of merit that can be obtained from this system. MARS/MP1 can predict future conditions of the MP-1 plant based on current plant data and their trends (time-dependent plant data). The objective of this paper is to present the research and development effort of the MARS/MP1 software at Northeast Utilities.

Khalil, Y.F. (Northeast Utilities Service Co., Berlin, CT (United States)); Raines, J.C. (Fauske Associates, Inc., Burr Ridge, IL (United States))

1992-01-01

104

Monitoring of soil and air-rock temperatures in the Western Massif of the Picos de Europa (Spain)  

NASA Astrophysics Data System (ADS)

In this paper we study the ground thermal regime and air-rock interface in the Western Massif of the Picos de Europa (Cantabrian Range, Spain). This calcareous massif is highly affected by karstification processes. Quaternary glaciers, fluvio-torrential processes and present-day periglacial processes also contribute to explain the landforms present in this massif. Up to 9 dataloggers were installed during 6 years in different sites in terms of altitude, orientation, slope and geomorpolohical setting recording temperatures every two hours. The number of freeze-thaw cycles in the soil(between 0 and 16) was controlled by the depth of the snow cover. The temperatures in the interface rock-air showed between 30-60 cycles, reaching 119 and 130 during the year 2007-2008. Extreme minimum temperatures in the soil oscillate between 0.3 and -6.3, while in the rocky walls the loggers recorded temperatures between -7.3 and -14.3°C. Monitoring of soil temperatures around the ice patch - the only one in the massif today - resulted in slightly negative mean annual temperatures. These conditions may reveal the existence of sporadic permafrost on debris that cover the ice patch. Both the buried ice and the permafrost are in disequilibrium with the current environmental conditions of the massif.

Ruiz-Fernández, Jesús; Vieira, Gonçalo; García, Cristina

2013-04-01

105

Antimalarial plants of northeast India: An overview  

PubMed Central

The need for an alternative drug for malaria initiated intensive efforts for developing new antimalarials from indigenous plants. The information from different tribal communities of northeast India along with research papers, including books, journals and documents of different universities and institutes of northeast India was collected for information on botanical therapies and plant species used for malaria. Sixty-eight plant species belonging to 33 families are used by the people of northeast India for the treatment of malaria. Six plant species, namely, Alstonia scholaris, Coptis teeta, Crotolaria occulta, Ocimum sanctum, Polygala persicariaefolia, Vitex peduncularis, have been reported by more than one worker from different parts of northeast India. The species reported to be used for the treatment of malaria were either found around the vicinity of their habitation or in the forest area of northeast India. The most frequently used plant parts were leaves (33%), roots (31%), and bark and whole plant (12%). The present study has compiled and enlisted the antimalarial plants of northeast India, which would help future workers to find out the suitable antimalarial plants by thorough study.

Shankar, Rama; Deb, Sourabh; Sharma, B K

2012-01-01

106

Recycled MORB in the Convecting Upper Mantle? Evidence From Os, Sr and Nd Isotopes in Orogenic Peridotites and Pyroxenites From the Totalp Massif, Eastern Switzerland  

Microsoft Academic Search

The presence of recycled mafic material in the MORB source region remains a subject of debate. Some orogenic peridotite massifs include materials from the deep lithosphere and may thus provide information on the asthenospheric sources of melts. The Totalp ultramafic massif in eastern Switzerland, which formed part of the Jurassic ocean floor in the ultraslow spreading Piedmont-Liguria ocean basin, is

D. van Acken; H. Becker; M. Weynell; F. Wombacher; R. J. Walker

2007-01-01

107

Genesis of platinum-bearing ultrabasic massifs in the plutonic chambers: evidence from melt inclusions  

NASA Astrophysics Data System (ADS)

Platinum-bearing ultramafic massifs occur as bodies of concentrically zonal inner structures due to the successive replacement of dunite with pyroxenite and gabbro from their cores to margins. A most important peculiarity of such massifs is their dunite cores, to which commercial Pt deposits are related. There are a different opinions about genesis of these massifs and geological, petrological, geochemical methods not always can solve this question. We found melt inclusions in Cr-spinel from dunites of the platinum-bearing Konder and Inagli massifs (Siberian Platform) and this provides direct evidence of the participation of magmatic systems in the crystallization of ultrabasic rocks. Contents of most major chemical components in the heated and quenched melt inclusions are close to those in biotite-pyroxene picrite and this testifies dunite crystallization from ultrabasic alkaline magma. Ion probe analyses of melt inclusions in Cr-spinel yielded relatively high water concentration in ultrabasic melts of the Konder (0.45-0.53 wt %) and Inagli (up to 0.63 wt %) massifs. These data are generally close to the water contents in magma that produced dunites of ophiolites (0.58-0.65 wt %) (Simonov et al., 2009). The REE patterns of inclusions in Cr-spinel from the Konder and Inagli dunites show a pronounced negative slope with strong enrichment of LREE relative to HREE, as is typical of plume-related magmatic systems of oceanic islands and continental hotspots. The values of such indicator ratios as Nb/U (23.4), Zr/Nb (7.20), and Th/U (3.0) of inclusions practically exactly coincide with those of glasses from areas of continental hotspots (Naumov et al., 2010). At the Nb/Y-Zr/Y diagram the data points of the inclusions plot within the field of melts with a plume source. As a whole the patterns of trace elements and REE in melt inclusions in the Cr-spinel provide evidence that mantle plumes affected the magmatic events, that produced dunites of the studied platinum-bearing ultramafic massifs. Our simulations on the basis of melt inclusion compositions by the PLUTON program package (Lavrenchuk, 2004) allowed to evaluate the crystallization temperature of dunites in the intrusive chambers. The most part of olivine was crystallized at 1460-1300°C and then, when the melt became less magnesian, this mineral continued to crystallize until to 1230°. The parameters evaluated with the help of another program (PETROLOG; Danyushevsky, 2001), based on data on melt inclusions, indicate that minimum temperature of the melts, from which olivine crystallized, was approximately 1230°. The model melt compositions (PLUTON program) are in good agreement with data on inclusions in Cr-spinel. For example, the calculated melt composition with 25.5 wt % MgO corresponds to 2.82 wt % 2, respectively, and melt inclusions with the same MgO (25.7 wt %) contain practically exactly coinciding K2O concentration of 2.7 wt %.

Simonov, V.; Prikhod'ko, V.

2012-04-01

108

Geological structures and geochronology of the Gonam Complex in the Gyeonggi Massif, South Korea  

NASA Astrophysics Data System (ADS)

Geological structures and geochronology of the Gonam Complex in the Gyeonggi Massif, South Korea You Hong Kihm and Sung Won Kim The Gonam complex is exposed in the westernmost part of the Gyeonggi Massif, which is recently thought be related with Triassic collision of China. This complex consists of various lithologies such as quartz schist, mica schist, quartzite, marble, leucocratic granite, mafic dyke and alkali granite. The Gonam complex can be divided into three units from south to north. The first is dominated by alternation of quartz schist and mica schist, which are intruded by leucocratic granites and mafic dykes. The second unit is highly sheared and folded quartzite. The last unit is composed of schists and marble intruded by acidic dykes, mafic dykes and foliated syenite. The deformation of the Gonam complex is characterized by one ductile shearing, two generations of folding, and four generations of faulting. The most prominent geological structures developed in the Gonam Complex are ductile structures, such as mylonitic foliations, mineral stretching lineations, sheath folds and oblique folds. At most outcrops the Gonam Complex was strongly sheared and intruded by amphibolitic dykes and leucocratic granites, which are also sheared. Widely developed mylonite indicates the ductile shearing occurred in high temperature metamorphic condition. SHRIMP zircon ages of detrital zircons obtained from schist and quartzite range from 3313 to 1819 Ma indicating the Gonam Complex deposited after Paleoproterozoic. Intrusion ages of foliated leucocratic granite, mafic dyke and foliated syenite are 821 Ma, 812 Ma and 751 Ma, respectively. And massive mafic dyke, syenite and two-mica granite (232~228 Ma) are interpreted as post-collisional igneous activity. These events are similar to those of Qinling-Dabie Belt and suggest that the Gyeonggi Massif is probably correlated to the Qinling-Dabie Belt.

Kihm, You Hong; Kim, Sung Won

2013-04-01

109

Metamorphic evolution of pelitic-semipelitic granulites in the Kon Tum massif (south-central Vietnam)  

NASA Astrophysics Data System (ADS)

Pelitic and semipelitic anatectic granulites form one of the major lithological units in Kan Nack complex of the Kon Tum massif (in south-central Vietnam), which comprises HT metamorphic and magmatic rocks including granulites and charnockites is classically regarded as the older part of the Gondwana-derived Indosinia terrain. Metamorphic evolution study of pelitic granulite, the most abundant among granulites exposed in this massif, facilitates to understand that tectonic setting take place during the Indosinian time. The paragenetic assemblages, mineral chemistry, thermobarometry and P-T evolution path of pelitic-semipelitic granulites from Kon Tum massif has been studied in detail. Petrographic feature demonstrates that the pelitic granulite experienced prograde history, from pregranulitic conditions in the amphibolite facies up to the peak granulitic assemblages. Successive prograde reactions led to the temperature-climax giving rise to assemblages with cordierite-hercynite and cordierite-hercynite-K-feldspar. Then, as attested by the mineralogic association occurring in cordieritic coronas, these rocks have been affected by retrograde conditions coeval with a decrease of the pressure. Thermobarometic results show that the highest temperature obtained by ksp/pl thermometry is 850 °C and the highest pressure obtained by GASP (Garnet Alumino-Silicate Plagioclase) is 7.8 kbar. The obtained clockwise P-T evolution path involving heating decompression, then nearly isothermal decompression and nearly isobar cooling conditions shows that high temperature-low pressure metamorphism of the studied pelitic anatectic granulites of Kan Nack complex occurred possibly in extensional setting during the Indosinian orogeny of 260-240 Ma in age.

Tích, Vu Van; Leyreloup, Andrey; Maluski, Henry; Lepvrier, Claude; Lo, Chinh-hua; V??ng, Nguy?n V.

2013-09-01

110

Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30°N  

NASA Astrophysics Data System (ADS)

Expeditions 304 and 305 of the Integrated Ocean Drilling Program cored and logged a 1.4 km section of the domal core of Atlantis Massif. Postdrilling research results summarized here constrain the structure and lithology of the Central Dome of this oceanic core complex. The dominantly gabbroic sequence recovered contrasts with predrilling predictions; application of the ground truth in subsequent geophysical processing has produced self-consistent models for the Central Dome. The presence of many thin interfingered petrologic units indicates that the intrusions forming the domal core were emplaced over a minimum of 100-220 kyr, and not as a single magma pulse. Isotopic and mineralogical alteration is intense in the upper 100 m but decreases in intensity with depth. Below 800 m, alteration is restricted to narrow zones surrounding faults, veins, igneous contacts, and to an interval of locally intense serpentinization in olivine-rich troctolite. Hydration of the lithosphere occurred over the complete range of temperature conditions from granulite to zeolite facies, but was predominantly in the amphibolite and greenschist range. Deformation of the sequence was remarkably localized, despite paleomagnetic indications that the dome has undergone at least 45° rotation, presumably during unroofing via detachment faulting. Both the deformation pattern and the lithology contrast with what is known from seafloor studies on the adjacent Southern Ridge of the massif. There, the detachment capping the domal core deformed a 100 m thick zone and serpentinized peridotite comprises ˜70% of recovered samples. We develop a working model of the evolution of Atlantis Massif over the past 2 Myr, outlining several stages that could explain the observed similarities and differences between the Central Dome and the Southern Ridge.

Blackman, D. K.; Ildefonse, B.; John, B. E.; Ohara, Y.; Miller, D. J.; Abe, N.; Abratis, M.; Andal, E. S.; Andreani, M.; Awaji, S.; Beard, J. S.; Brunelli, D.; Charney, A. B.; Christie, D. M.; Collins, J.; Delacour, A. G.; Delius, H.; Drouin, M.; Einaudi, F.; EscartíN, J.; Frost, B. R.; Früh-Green, G.; Fryer, P. B.; Gee, J. S.; Godard, M.; Grimes, C. B.; Halfpenny, A.; Hansen, H.-E.; Harris, A. C.; Tamura, A.; Hayman, N. W.; Hellebrand, E.; Hirose, T.; Hirth, J. G.; Ishimaru, S.; Johnson, K. T. M.; Karner, G. D.; Linek, M.; MacLeod, C. J.; Maeda, J.; Mason, O. U.; McCaig, A. M.; Michibayashi, K.; Morris, A.; Nakagawa, T.; Nozaka, T.; Rosner, M.; Searle, R. C.; Suhr, G.; Tominaga, M.; von der Handt, A.; Yamasaki, T.; Zhao, X.

2011-07-01

111

A new order in northeast Asia  

SciTech Connect

The fate of northeast Asia is central to the global balance of power. But just as the Cold War took a different course in northeast Asia than it did in its central battleground in Europe, so the post-Cold War world in northeast Asia is taking on a different shape. In Europe, formal arms control was a feature of the political landscape both before and after sweeping changes began altering the face of the continent in 1989. In contrast, northeast Asia saw only informal arms control measures before 1989. But in the post-Cold War world, the opportunity for more formal accords seems to be growing as the changing political environment makes them possible. In the rapidly developing virtuous circle of detente in northeast Asia, the prospects for arms control progress are better than ever, although considerable obstacles remain in the way. One of the unique features of northeast Asia is the convergence of interests of four of the world's most powerful nations - the US, the Soviet Union, Japan, and China. But unlike Europe, where the interests of the Soviet Union and the US have intermingled with those of the diverse members of the European Community (EC) and resulted in far-reaching arms reduction and confidence-building accords, northeast Asia has known only limited regional efforts at reducing tension and enhancing regional security. Nevertheless, unilateral moves and bilateral discussions among the four powers have produced a Sino-Soviet detente, reductions in US and Soviet forces in the Pacific region, the beginning of a Soviet-Japanese dialogue aimed at normalizing relations, and an overall trend toward closer diplomatic and economic relations throughout the region.

Segal, G.

1991-09-01

112

Polymetamorphic Garnets in the Menderes Massif (Western Turkey): Insights into the Metamorphic History of a Complexly-Deformed Region  

NASA Astrophysics Data System (ADS)

The Menderes Massif in the Aegean region is a prime example of an area that experienced a complex, multi-stage metamorphic history. Post-collisional extension exhumed the Menderes Massif, which covers an area of >40,000 km2. The Massif experienced polyphase deformation, but distinguishing Pan-African events from Alpine metamorphism, and discriminating Eocene-Oligocene compression from the post-collisional extension are controversial. To identify if Menderes Massif garnets record this polymetamorphic history, we used an electron microprobe to X-ray element map and identify zoning types. One southern Menderes Massif sample has garnet + biotite + muscovite + chlorite + plagioclase + ilmenite + zircon + allanite + monazite + quartz. X-ray element maps of the garnets show a discontinuous Mn increase not found near minerals characteristic of retrogression, defining a ˜30-?m plateau. The Mn increase appears at the same location as a sharp Ca decrease and Mg increase. The profile leaves open the possibility the garnets grew during two stages and/or experienced a change in bulk composition during rim growth. One garnet from the Kuzey Detachment, which bounds the northern edge of the Central Menderes metamorphic core complex, shows no zoning in Mn, Fe, Mg, or Ca, and has a 483+/-5 Ma monazite inclusion. This result indicates the sample experienced significant diffusional relaxation since its time of formation. Garnet-based P-T conditions are frequently used to evaluate and develop models for the tectonic evolution of the Menderes Massif. If the garnets are detrital, polymetamorphic, or developed during a previous metamorphic event, using their compositions in combination with matrix minerals generates misleading conditions and erroneously constrained tectonic models.

Ozerdem, C.; Catlos, E. J.; Cemen, I.

2003-12-01

113

Types Of The Focal Mechanisms Of Seismic Events In The Khibiny Massif  

NASA Astrophysics Data System (ADS)

The stress-strain state of Khibiny massif and the focal mechanisms of microseismic events (magnitudes as many M=1) were investigated. This analysis was based on seis- mical data registered by automized monitoring system of in the ore mines "Apatite" as well as on the catalogue of earthquakes registered by Kola regional seismological centre. The main goal of this study is the estimation of applicability of methods of quantitative seismology for a solution of local tasks of prognosis of the dynamic phe- nomena in the ore mines of Khibiny massif during widescale mining operations. On the basis of the existing methods original computer programs were developed. Taking into account features of local monitoring systems of seismicity and collection of the obtained data on focal mechanisms, calculations of matrix of mean "composite" focal mechanisms of the registered seismic events were carried out. The process of grouping of events was based on revealing of similar focal mechanisms. Eigen value analysis of average matrix was performed and the directions of main stresses and tendency of principal deformation directions in the massif are revealed. Thus schema of relative blocks movements is created. As a result of this study 5 basic groups with different types of focal mechanisms of seismic events are selected: normal fault; strike-slip fault (with contraction along the strike of ore bodies), thrust fault, and two interme- diate types - strike-slip with normal movement and strike-slip with upthrust move- ment. Specific structural blocks are revealed on the basis of schema of fault zones and zones of tectonic weakness and analysis of seismic events with the particular focal mechanisms. The directions of main stresses based on the composite focal mecha- nisms well correlates with the directions obtained by other methods. Composite focal mechanisms determined for low magnitude seismic events may be effectively used to control stress-strain state in rock massif, to select configuration of structural blocks restricted by plains of fissures. The researches are executed at support of the Russian foundation for basic research - projects 00-05-64758, 01-05-65340.

Fedotova, I. V.; Yunga, S. L.

114

Geochemical characteristics of rare earth elements in soil of the Ditru Massif, Eastern Carpathians, Romania  

NASA Astrophysics Data System (ADS)

The present paper describes the level of rare earth elements in soils developed from Ditr?u massif area for evaluating of the background of these elements and accurate assessment of environmental impact. Also this paper contributed to understanding the important role of parent rocks in pedogenic processes. The Ditr?u Alkaline Massif represent an intrusion body with a internal zonal structure, which was emplaced into pre-Alpine metamorphic rocks of the Bucovinian nappe complex close the Neogene - Quaternary volcanic arc of the Calimani-Guurghiu- Harghita Mountain chain. The center of massif was formed by nepheline syenite, which is surrounded by syenite and monazonite. North-western and north-eastern marginal sectors are composed of hornblende gabbro/hornblendite, alkali diorite, monzodiorite, monzosyenites and alkali granite. Small discrete ultramafic bodies (kaersutite-bearing peridotite, olivine, pyroxenite and hornblendite) and alkali gabbros occur in the Jolotca area. All this rocks are cut by late-stage dykes with a large variety of composition including tinguaite, phonolite, nepheline syenite, microsyenite, and aplite. The types of soils predominant in this zone are lithosoils. These soils are shallow developed, have low content in organic matter and reflects mineralogical and geochemical composition of the bedrock. The soil samples were collected from 70 location for all type of representative rocks (approximately 10 soil sampling points for each type of rock). The samples were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The pH values of these samples varied from 3.6 to 7.3, in general, the soils from massif area are acid or weakly acidic. The pH controls the abundance of REE in soil, the concentration of REE increases with decreasing pH values. In soil samples analyzed the contents of REE follow the order: Ce > La > Nd > Pr > Sm > Eu > Gd > Dy > Yb > Er > Tb > Ho >Tm. ? REE varied from 52.59 ?g g-1 to 579.2 ?g g-1 , the average is 273.14 ?g g-1. The chemical analysis of soil showed an enrichment in LREE (from La to Eu) and a depletion in HREE (from Gd to Lu). Relatively high levels of LREE concentration in soil are genetically associated with REE mineralization. The soil samples developed on the syenite and nephelin syenite are enriched in HREE. The REE chondrite - normalized plots showed for most soils in the sampling area strongly negative anomalies for cerium and europium, positive anomalies for gadolinium and dysprosium. The distribution of REE in soil is given and controlled by the presence of primary minerals (potasic and plagioclase feldspars) and accessory minerals (zircon, monazite, titanite, allanite, apatite, xenotime, thorite, bastnäsite) in bedrock.

Ion, Adriana

2013-04-01

115

Degassing and redox effects in the magma chamber of the Guli massif (Polar Siberia)  

NASA Astrophysics Data System (ADS)

The Guli massif occupies a large area between the Maymecha and Kotui Rivers at the boundary of the Siberian platform with the Khatanga trough. It has a roughly oval shape of 35-45 km, and, including the two-thirds obscured by Quaternary deposits, has an area of 1500-1600 km2. The Guli massif, like many of the other alkaline-ultrabasic intrusions, is a composite, multi-stage pluton. The predominant rocks of the massif are dunites, which occupy about 60% of the total area, and a range of melanocratic alkaline rocks, which extend over about 30%. The other rock types, including melilitolite, ijolite, alkaline syenite and carbonatite, occupy less than 10% of the area. Dunite intrusives were cut by numerous bodies of Ti-Fe ore pyroxenite (kosvite) that are composed mainly of pyroxene and titanomagnetite with accessory apatite and titanite, and form about 10% of the volume of the dunites. Among the volcanics and dyke rocks in the area surrounding the Guli massif olvine-rich meimechites play substantial role. Variations of Mg# of olivines from dunite indicat presence of cryptic layering, whereas evolution of spinels from chromites to titanomagnetites in less magnesian varieties indicate gradual transition from dunites to kosvites. Original layering is obscured by intense folding. Trace-element diagram normalized to pyrolite and Lu shows that interstitial material present between olivines of dunites is identical to meimechites. This implies that primary magma of the Guli intrusion had meimechite composition. Some zoned olivines show regular decrease in Ni and increase in Mn from core to margin, whereas variation of Ca content in the same grains pass through several maxima and minima. This reflects accumulation of both Ca and CO2 in the residual melt with episodic loss of CO2 leading to the increase in the activity of CaO. Eventually this process leads to the formation of melilite-bearing rocks, alkaline magmas and carbonatites. In many samples of kosvites Ni content in olivines correlates negatively with their Mg#'s. This is opposite to usual behaviour of Ni during the crystallization of olivine-bearing rocks. It may be explained by simultaneous crystallization of the large proportion of magnetite, which in turn indicates highly oxidized nature of this magmatic system. Magma chamber of the Guli intrusion was originally filled with meimechite magma. Its crystallization created huge pile of olivine-rich cumulates. Kosvites, melilite-bearing rocks, alkaline rocks and carbonatites are most likely to have been formed by the crystallization of filter-pressed melts derived from earlier cumulates. The variety of rocks within the Guli magmatic complex are basically result of in situ differentiation.

Ryabchikov, I. D.; Kogarko, L. N.; Kuzmin, D. V.

2012-04-01

116

Petrostructural evolution of ultramafic rocks of the Kalninsky chromite-bearing massif, Western Sayan  

NASA Astrophysics Data System (ADS)

The Kalininsky ultramafic massif is a fragment of lower structural zone of the Kurtushiba ophiolitic belt in the extreme northeastern part of the Western Sayan. The massif is composed largely of rocks making up the dunite-garzburgite banded complex. The northeastern part of the massif is composed mainly of dunite with linear NW-trending chromite-bearing zones, the localization of which is controlled by banding of the dunite-harzburgite complex. Harzburgite and dunite are characterized by inhomogeneous structures and textures caused by nonuniform ductile deformation, which is expressed as heterogeneous extinction, kink bands, and syntectonic and annealing recrystallization. The petrostructural patterns of olivine in harzburgite and dunite provide evidence for three stages of ductile deformation. At the first stage under deep mantle-crustal conditions, the ductile flow of ultramafic rocks developed mainly in a regime of axial compression, high temperature (>1000°C), and low strain rate (? < 10-6 s-1), which resulted in translational gliding along the (010)[100] and (100)[001] systems in olivine and enstatite, respectively, in combination with a subordinate role of syntectonic recrystallization. Consequently, the rocks acquired a medium-grained (mesogranular) microstructure. At the second stage, related to the thermal effect on ultramafics, the ductile flow developed under the settings of low strain rate (? < 10-6 s-1) and rising temperature (>1000°C). The translational gliding in olivine proceeded largely along (010)[100] and was accompanied by diffusion creep. As the temperature rose, ductile deformation gave way to secondary recrystallization of annealing, which facilitated the growth of olivine grains free of dislocations owing to absorption of individual grains oriented adversely relative to the compression axis and deformed grains saturated with dislocations. As a result, dunite and harzburgite with a coarse-grained porphyroblastic microstructure have been formed. The third stage of ductile flow was apparently related to their transport along deep-seated thrust faults under settings of intense shear deformations at a high temperature (˜1000°C) and strain rate (? >10-4 s-1). The ductile flow in olivine resulted in heterogeneous translational gliding along (010)[100] and accompanied by intense syntectonic recrystallization with the formation of a porphyroblastic microstructure. Chromite mineralization in dunite is controlled by internal banding. Intense ductile flow facilitated the metamorphic separation of linearbanded Cr-spinel segregations. Thus, the results of a petrostructural study show that ultramafic rocks of the Kalninsky massif, ascending to the upper lithosphere, underwent both axial and shear ductile deformations in the mantle and lower crust, and these deformations controlled chromite mineralization.

Chernyshov, A. I.; Yurichev, A. N.

2013-07-01

117

Geology, petrology and isotope geochemistry of massif-type anorthosites from southwest Madagascar  

Microsoft Academic Search

Four massif-type anorthosite bodies 25–100?km2 in area occur within high-pressure granulite facies supracrustal gneisses in southwestern Madagascar. Two of these bodies\\u000a (Ankafotia and Saririaky) appear to have been pulled apart by 40?km in a ductile shear zone, but structural features such\\u000a as sub-vertical stretching lineations indicate an origin by intense west-directed flattening and pure shear. Country rocks\\u000a (Graphite Series) include

Lewis D. Ashwal; Michael A. Hamilton; Vincent P. I. Morel; Roger A. Rambeloson

1998-01-01

118

Crustal and uppermost mantle structure of the Bohemian Massif based on CELEBRATION 2000 data  

Microsoft Academic Search

The deep structure of the Bohemian Massif (BM), the largest stable\\u000a outcrop of Variscan rocks in central Europe, was studied using the data\\u000a of the international seismic refraction experiment Central European\\u000a Lithospheric Experiment Based on Refraction (CELEBRATION) 2000. The data\\u000a were interpreted by seismic tomographic inversion and by two-dimensional\\u000a (2-D) trial-and-error forward modeling of P and S waves. Additional\\u000a constraint

P. Hrubcová; P. Sroda; A. Spicák; A. Guterch; M. Grad; G. R. Keller; E. Brueckl; H. Thybo

2005-01-01

119

The Horoman Peridotite Massif: an Example of Ancient Ultraslow-Spreading Ridge Abyssal Peridotites?  

NASA Astrophysics Data System (ADS)

Ultraslow-spreading ridges (full spreading rate less than 20 mm per year) comprise about one third (lengthwise) of the global ridge system today, and might also have been important in the geologic past, particularly after breakup of large continents. Geochemical studies of abyssal peridotites show that large local- scale (single-dredge to hand specimen scales) variations in isotopic composition, modal abundance of clinopyroxene (CPX), and trace element abundance in CPX are distinct characteristics of ultraslow-spreading ridge peridotites. It is suggested that these local-scale variabilities are produced by melt-rock reaction during melt migration in the mantle (e.g., Warren et al., 2006). We explored using these geochemical characteristics to identify ancient ultraslow-spreading ridge peridotites among "orogenic lherzolite massifs". The Horoman peridotite massif in Hokkaido, Japan, possesses DMM-like initial Nd and Sr isotopic characteristics at the time of melt extraction, and displays large variations in modal CPX (13.2 - 5.2%, only for lherzolites and plagioclase lherzolites) and in trace elements in CPX (e.g., Nd ranges from 0.3 to 10 times C1 chondrite) over a sampling scale length of 150 m. Additionally, there is ample evidence for chromatographic melt-rock reaction in the presence of garnet (Takazawa et al., 1996; Yoshikawa and Nakamura, 2000). These geochemical characteristics are very similar to those observed for the present-day ultraslow-spreading ridge peridotites such as those from the SWIR and Gakkel ridge. A whole-rock Sm-Nd isochron age for the plagioclase lherzolites of 830+/-78 Ma (Yoshikawa and Nakamura, 2000) and a suggestion by Saal et al. (2001) that refertilization of depleted peridotites by a MORB-like magma occurred around 900 Ma, based on the Re-Os systematics, indicate that melt extraction and melt-rock reaction formed the Horoman peridotite massif at 800 to 900 Ma. This time is similar to that, 750 Ma, estimated for formation of the Paleopacific ocean by rifting of the Rodinia supercontinent (e.g., Torsvik, 2003). We suggeset that the Horoman massif could represent abyssal peridotite beneath the Paleopacific ridge when its spreading rate was ultraslow. Saal et al. (2001) J. Petrol., 42, 25-37; Takazawa et al. (1996) Chem. Geol., 134, 3-26; Torsvik (2003) Science, 300, 1379-1381; Yoshikawa and Nakamura (2000) JGR, 105, 2879-2901; Warren et al. (2006) Goldschmidt Conf. Abstract.

Shimizu, N.; Warren, J. M.; Frey, F. A.; Takazawa, E.

2006-12-01

120

Crystal structure of hydrogen-bearing vuonnemite from the Lovozero alkaline massif  

NASA Astrophysics Data System (ADS)

Hydrogen-bearing vuonnemite from the Shkatulka hyperagpaitic pegmatite (the Lovozero alkaline massif, Kola Peninsula) was studied by single-crystal X-ray diffraction. The triclinic unit-cell parameters are as follows: a = 5.4712(1) Å, b = 7.1626(1) Å, c = 14.3702(3) Å, ? = 92.623(2)°, ? = 95.135(1)°, ? = 90.440(1)°, sp. gr. P1, R = 3.4%. The Na+ cations and H2O molecules are ordered in sites between the packets. The water molecules are hydrogen bonded to the PO4 tetrahedra.

Rastsvetaeva, R. K.; Aksenov, S. M.; Verin, I. A.; Lykova, I. S.

2011-05-01

121

Landscape evolution rates for a cyclic climate within an uplifting massif  

NASA Astrophysics Data System (ADS)

Quaternary rates of rocks exhumation and transport have been determined from the watersheds to the outlet of a 20-km-long, 2-km-high catchment within an uplifting massif of the Gobi-Altay mountain range (Mongolia). This massif is set in a structurally and chronologically well-studied restraining bend along the Bogd fault, characterized by semi-arid climate alternating long dry and short wet stages with a 100-kyrs periodicity. My approach combines geomorphic field-based investigation and 10Be concentration distribution analysis on bedrock, hillslope colluvia and alluvial sediments from active river or abandoned terraces and fans. The main geomorphic questions addressed in this work are: 1) What are the mechanisms and rates of pre-deposition processes, from sediment formation until deposit and abandonment of alluvial terraces and fans? In particular, I focus the analysis on bedrock exhumation, stocking of colluvia on the hillslopes, and their remobilization and transport within the drainage network. Characteristic times of these processes are poorly known up to date, although they have dramatic importance in landscape evolution modeling. 2) What is the impact of post-deposition processes in the evolution of alluvial surfaces morphology? Analyzing terraces of different ages and at different settings along the river, I compare their relative denudation rates derived from changes in topographic slope and local lowering rate due to matrix remobilization by wind deflation and runoff.

Vassallo, R.

2009-04-01

122

The age of Kondyor massif dunites (Aldan Province, Russia): First U-Pb isotopic data  

NASA Astrophysics Data System (ADS)

The material and isotope-geochemical peculiarities of zircons from dunites of the Kondyor massif (Aldan Province, Southeast Siberian Craton) have been described for the first time. This massif is associated with an economic platinum placer deposit. On the basis of detailed study of the morphology, internal structure, and geochemical characteristics, zircons have been subdivided into two types. The first type is represented by crystals of oval and rounded shapes, characterized by a bimodal distribution of "ancient" (2477 ± 18 and 1885 ± 52 Ma) U-Pb (SHRIMP-II) ages. The second type of zircons forms idiomorphic crystals and aggregates of prismatic habitus, forming two "young" age clusters (176 ± 1.2 and 143 ± 2.0 Ma). The obtained results allow us to make a conclusion about the long evolution of platinum-bearing dunites. The first type of zircons formed by metamictic cores and homogeneous peripheral rims indicates the time of metamorphism at the Archean-Proterozoic boundary (˜2.5 Ga), implying an older age of porous zircon cores. Such zircons characterize the minimal age of the initial mantle substance or a close time when the platinum-bearing dunite was generated. Based on their formation time, the second type of zircons can be referred to the epoch of tectonic-magmatic activation of the Aldan Shield. The new geochronological data, along with the material identity of dunites from the Urals and the Aldan Province, argue for a common genetic origin of platinum-bearing dunites of the fold belts and ancient cratons.

Malitch, K. N.; Efimov, A. A.; Badanina, I. Yu.

2012-09-01

123

Why United States Armed Forces are Needed in Northeast Asia.  

National Technical Information Service (NTIS)

This paper attempts to provide reasons for maintaining U.S. forces in Northeast Asia. It describes the current situation in Northeast Asia with the nuclear proliferation issue with North Korea, the ideological differences with China, and the economic prob...

R. J. Jefferis

1994-01-01

124

Northeast Creek Bridge. North East, Cecil Co., MD. Sec. 1201, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Northeast Creek Bridge. North East, Cecil Co., MD. Sec. 1201, MP 51.03. - Northeast Railroad Corridor, Amtrak route between District of Columbia/Maryland state line & Maryland/Delaware state line, Baltimore, Independent City, MD

125

11. DETAIL SHOWING ROLLING ENGINE DECK AND NORTHEAST TRUSS OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. DETAIL SHOWING ROLLING ENGINE DECK AND NORTHEAST TRUSS OF SUPERSTRUCTURE. Looking northeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

126

7. Oil house, view northeast, west and south sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. Oil house, view northeast, west and south sides - Great Duck Island Light Station, At southern tip of Great Duck Island southeast of Bass Harbor & northeast of Frenchboro, Frenchboro, Hancock County, ME

127

3. Light tower and fog signal house, view northeast, west ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Light tower and fog signal house, view northeast, west and south sides - Great Duck Island Light Station, At southern tip of Great Duck Island southeast of Bass Harbor & northeast of Frenchboro, Frenchboro, Hancock County, ME

128

1. BUILDING 522, SOUTH SIDE, OBLIQUE VIEW, FROM NORTHEAST CORNER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. BUILDING 522, SOUTH SIDE, OBLIQUE VIEW, FROM NORTHEAST CORNER OF BUILDING 431, LOOKING NORTHEAST. - Oakland Naval Supply Center, Aeronautical Materials Storehouses, Between E & G Streets, between Fourth & Sixth Streets, Oakland, Alameda County, CA

129

3. BUILDING 432, OBLIQUE VIEW OF SOUTH SIDE, FROM NORTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. BUILDING 432, OBLIQUE VIEW OF SOUTH SIDE, FROM NORTHEAST CORNER OF BUILDING 333, LOOKING NORTHEAST. - Oakland Naval Supply Center, Paint & Oil Storehouses, Between G & I Streets, between Fourth & Fifth Streets, Oakland, Alameda County, CA

130

2. BUILDING 432, OBLIQUE VIEW OF WEST SIDE, FROM NORTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. BUILDING 432, OBLIQUE VIEW OF WEST SIDE, FROM NORTHEAST CORNER OF BUILDING 333, LOOKING NORTHEAST. - Oakland Naval Supply Center, Paint & Oil Storehouses, Between G & I Streets, between Fourth & Fifth Streets, Oakland, Alameda County, CA

131

9. Interior view of conference room; showing exterior windows; northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Interior view of conference room; showing exterior windows; northeast corner of north wing; view to northeast. - Ellsworth Air Force Base, Administration Office, 2704 George Drive, Blackhawk, Meade County, SD

132

2. TOOL HOUSE. NORTHEAST AND SOUTHEAST SIDES. VIEW TO WEST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. TOOL HOUSE. NORTHEAST AND SOUTHEAST SIDES. VIEW TO WEST. - Rainbow Hydroelectric Facility, Tool House, On north bank of Missouri River 2 miles Northeast of Great Falls, & end of Rainbow Dam Road, Great Falls, Cascade County, MT

133

1. TOOL HOUSE. NORTHEAST AND NORTHWEST SIDES. VIEW TO SOUTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. TOOL HOUSE. NORTHEAST AND NORTHWEST SIDES. VIEW TO SOUTHEAST. - Rainbow Hydroelectric Facility, Tool House, On north bank of Missouri River 2 miles Northeast of Great Falls, & end of Rainbow Dam Road, Great Falls, Cascade County, MT

134

53. INTERIOR VIEW LOOKING NORTH NORTHEAST SHOWING THE REMAINS OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

53. INTERIOR VIEW LOOKING NORTH NORTHEAST SHOWING THE REMAINS OF A WOODEN SETTLING BOX IN THE BACKGROUND RIGHT. AMALGAMATING PANS IN THE FOREGROUND. - Standard Gold Mill, East of Bodie Creek, Northeast of Bodie, Bodie, Mono County, CA

135

27. NORTHEAST ROOM ORIGINALLY CLASSROOM NO. 1, LAST USED ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

27. NORTHEAST ROOM - ORIGINALLY CLASSROOM NO. 1, LAST USED AS A LOCKER ROOM. SECOND FLOOR - OFFICE. VIEW TO NORTHEAST. - Milwaukee Light, Heat & Traction Company, 8336 West Lapham Street, West Allis, Milwaukee County, WI

136

Medium Scale Irrigation Systems in Northeast Thailand: Future Directions.  

National Technical Information Service (NTIS)

The study focuses on the USAID/Government of Thailand-funded Northeast Small Scale Irrigation (NESSI) Project and irrigation rehabilitation scheme, which involves seven medium-scale irrigation systems in Northeast Thailand. The study provides detailed pos...

S. H. Johnson S. Patamatamkul

1989-01-01

137

19. INTERIOR OF NORTHEAST REAR BEDROOM SHOWING ALUMINUMFRAME SLIDING GLASS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. INTERIOR OF NORTHEAST REAR BEDROOM SHOWING ALUMINUM-FRAME SLIDING GLASS WINDOWS. VIEW TO NORTHEAST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

138

Telephone wiring in northeast corner of utility room, basement of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Telephone wiring in northeast corner of utility room, basement of Administration Building. View to northeast. - San Bernardino Valley College, Classics Building, 701 South Mount Vernon Avenue, San Bernardino, San Bernardino County, CA

139

Stratigraphy of Upper Cretaceous-Palaeogene sequences in the southern and eastern Menderes Massif (western Turkey)  

NASA Astrophysics Data System (ADS)

The stratigraphy of the uppermost levels of the Menderes Massif is controversial and within its details lie vital constraints to the tectonic evolution of south-western Turkey. Our primary study was carried out in four reference areas along the southern and eastern Menderes Massif. These areas lie in the upper part of the Menderes metamorphic cover and have a clear stratigraphic relationship and contain datable fossils. The first one, in the Akbük-Milas area, is located south-east of Bafa Lake where the Milas, then K?z?la?aç and Kaz?kl? formations are well exposed. There, the Milas formation grades upwards into the K?z?la?aç formation. The contact between the K?z?la?aç and the overlying Kaz?kl? formation is not clearly seen but is interpreted as an unconformity. The Milas and K?z?la?aç formations are also found north of Mu?la, in the region of Yata?an and Kavakl?dere. In these areas, the Milas formation consists of schists and conformably overlying platform-type, emery and rudist-bearing marbles. Rudists form the main palaeontological data from which a Santonian-Campanian age is indicated. The K?z?la?aç formation is characterized by reddish-greyish pelagic marbles with marly-pelitic interlayers and coarsening up debris flow deposits. Pelagic marbles within the formation contain planktonic foraminifera and nanoplankton of late Campanian to late Maastrichtian age. The Kaz?kl? formation is of flysch type and includes carbonate blocks. Planktonic foraminifera of Middle Palaeocene age are present in carbonate lenses within the formation. In the Serinhisar-Tavas area, Mesozoic platform-type marbles (Y?lanl? formation) belonging to the cover series of the Menderes Massif exhibit an imbricated internal structure. Two rudist levels can be distinguished in the uppermost part of the formation: the first indicates a middle-late Cenomanian age and the upper one is Santonian to Campanian in age. These marbles are unconformably covered by the Palaeocene-Early Eocene Zeybekölentepe formation with polygenetic breccias. In the Çal-Denizli area, the Menderes massif succession consists of cherty marbles and clastic rocks with metavolcanic lenses. The Lower-Middle Eocene ?alvan formation lies unconformably on this sequence and is interpreted as equivalent to the marble horizons at Serinhisar but with pelagic facies. The ?alvan formation consists of shale, mafic volcanic rock, lenses of limestone and blocks of recrystallized limestone. The ?alvan formation is dated here for the first time by Early-Middle Eocene foraminifera and nanoplankton from the matrix of the formation. An angular unconformity exists between the Upper Cretaceous and Lower Tertiary sequences, suggesting that a phase of deformation affected the southern and eastern part of the Menderes Massif at this time. This deformation may be caused by initial obduction of the Lycian ophiolite onto the passive margin to the north of the Menderes carbonate platform during the latest Cretaceous. Drowning of the platform led to termination of carbonate deposition and deposition of deep water flysch-like clastic sediments.

Özer, Sacit; Sözbilir, Hasan; Özkar, ?zver; Toker, Vedia; Sari, Bilal

2001-03-01

140

Melt percolation and associated deformation: field and microstructural evidence from the Beni Bousera ultramafic massif  

NASA Astrophysics Data System (ADS)

Experimental studies on melt extraction in the upper mantle have indicated that deformation and melt segregation are intimately related. Extrapolating from experiments to nature requires detailed knowledge of the large-scale geometry, microstructure and kinematics associated with melt transport. Here we present a field study from the Beni Bousera ultramafic massif (NE Morocco) describing the macro and microstructural relationships between melt percolation zones and host peridotite in order constrain these aspects of melt percolation zones in the upper mantle. In Beni Bousera, evidence indicates that melt flow and deformation occurred simultaneously. Pyroxenite dikes are not evenly distributed: we identified ten to hundred meter-wide heterogeneous zones (HZ) characterized by abundant pyroxenite dikes, replacive dunite, harzburgite, and “secondary” lherzolites, within a homogenous “primary” lherzolite. A few pyroxene dikes are sporadically present throughout the massif, but most dikes occur within the HZ. There is a distinct difference in mineral chemistry, texture, and deformation fabric observed in the HZ and we interpret these zones as areas of focused melt percolation. In these zones, peridotites show a foliation and lineation defined by spinel and pyroxenes. Sharply defined (garnet-) augite dikes are generally parallel to the foliation and locally observed in isoclinal recumbent folds with axial planes parallel to foliation and fold axes parallel to lineation. In contrast, Cr-diopside dikes and patches exhibit irregular, diffuse contacts with surrounding peridotites, can crosscut the foliation, and are generally less deformed than (garnet-) augite dikes from the same outcrop indicating that deformation was contemporaneous with the formation of the Cr-diopside patches. Microstructural observations in peridotites show a secondary oblique foliation defined by the shape preferred orientation of olivine. This was used to infer a generally top to the south shear sense, but a change in shear sense is observed across a large HZ in the north of the massif. To confirm this observation, we analyzed lattice preferred orientation (LPO) of olivine from a transect across the northern HZ. The LPO patterns show “A-type” fabric with the olivine [100] axis aligned with the lineation. Across the HZ the orientation of the [100] axis with respect to the mineral foliation changes asymmetrically. Olivine [100] aligns with the shear plane at lower strains than the finite strain ellipsoid, thus this change can be interpreted to indicate an increase in strain towards the center of the HZ and a change in shear sense across the zone, possibly driven by melt induced buoyancy and associated local diapirism of the HZ. Field mapping of the distribution of the HZ indicates km-scale networks of melt percolation zones within the upper mantle. As the border of the massif with the surrounding lower crustal gneisses is the most significant HZ we speculate that the emplacement of the massif occurred along a major melt percolation zone.

Stanley, J.; Jagoutz, O. E.; Hirth, G.; Targuisti, K.

2010-12-01

141

Climate change in the Brazilian northeast  

NASA Astrophysics Data System (ADS)

Climate Change, Impacts and Vulnerabilities in Brazil: Preparing the Brazilian Northeast for the Future; Natal, Brazil, 27 May to 01 June 2012 The variability of the semiarid climate of the Brazilian northeast has enormous environmental and social implications. Because most of the population in this area depends on subsistence agriculture, periods of severe drought in the past have caused extreme poverty and subsequent migration to urban centers. From the ecological point of view, frequent and prolonged droughts can lead to the desertification of large areas. Understanding the causes of rainfall variability, in particular periods of severe drought, is crucial for accurate forecasting, mitigation, and adaptation in this important region of Brazil.

Rodrigues, Regina R.; Haarsma, Reindert J.; Hoelzemann, Judith J.

2012-10-01

142

Northeast Natural Gas Market in 2030  

EIA Publications

LNG imports have grown substantially in recent years and they are expected to grow sevenfold by 2030. A review of the industry and infrastructure in the Northeast shows a region with limited indigenous production, so the region relies on flows into the area for most of the natural gas it consumes. A key source of supply is the LNG import terminal located in Everett, Massachusetts, which provides about 20 percent of regional supply. The United States needs additional LNG imports to meet future natural gas demand, however, building new LNG terminals in the Northeast or elsewhere involves a number of tradeoffs that will depend on energy markets and local acceptance.

Information Center

2006-09-27

143

A Warning System For Catastrophic Man-made Hazards Using Electromagnetic Induction Monitoring Verified In Rock Burst Massif  

Microsoft Academic Search

By providing mining works in high stressed rock massif the man-made seismicity become evident, therefore the problem of its forecasting and prevention attracts much attention in all countries with developed mining industry. The near-term forecasting plays a significant role, but till now the developing of a method which allows to define quantitative criterions for the warning system is a large

Olga Hachay; Oleg Khachay

2010-01-01

144

Massification, Bureaucratization and Questing for "World-Class" Status: Higher Education in China since the Mid-1990s  

ERIC Educational Resources Information Center

Purpose: This article aims to review the latest developments of the higher education sector in China since the mid-1990s by focusing on the expansion of university education. Design/methodology/approach: It is argued that while massification of higher education is an important indication of the progress in China's higher education system, the…

Ngok, Kinglun

2008-01-01

145

Fruits and seeds from Roman cremations in Limagne (Massif Central) and the spatial variability of plant offerings in France  

Microsoft Academic Search

During Roman times plant products were frequently used as offerings in graves. The cremation ritual, dominant during the two first centuries AD in Gaul, allowed the preservation of some of these plant remains by carbonization. Up to now in Grande Limagne (Auvergne, Massif Central) only one cremation burial had given rise to archaeobotanical study. Five new sites are analysed in

Laurent Bouby; Philippe Marinval

2004-01-01

146

Comprenhensive Program of Engineering and Geologic Surveys for Designing and Constructing Radioactive Waste Storage Facilities in Hard Rock Massifs  

SciTech Connect

Geological, geophysical, and engineering-geological research conducted at the 'Yeniseisky' site obtained data on climatic, geomorphologic, geological conditions, structure and properties of composing rock, and conditions of underground water recharge and discharge. These results provide sufficient information to make an estimate of the suitability of locating a radioactive waste (R W) underground isolation facility at the Nizhnekansky granitoid massif

Gupalo, T; Milovidov, V; Prokopoca, O; Jardine, L

2002-12-27

147

Montane vegetation of the Mt. Field massif, Tasmania: a test of some hypotheses about properties of community patterns  

Microsoft Academic Search

direct gradient analysis was applied to the montane vegetation of the Mt. Field massif, Tasmania. Ecological response surface were constructed, describing the relationship between the mean % cover of each of 100 vascular plant species and two major environmental complex-gradients represented by soil drainage and altitude. The hypotheses tested were that: (1) the ecological responses of species are generally of

Peter R. Minchin

1989-01-01

148

Catastrophic rock slope failures and late Quaternary developments in the Nanga Parbat–Haramosh Massif, Upper Indus basin, northern Pakistan  

Microsoft Academic Search

The Nanga Parbat–Haramosh Massif has some of the greatest relief on Earth and highest measured rates of uplift, denudation, and river incision in bedrock. Many studies have sought to understand how its morphology relates to geotectonic evolution and glaciations. However, few catastrophic rock slope failures had been recognised and many of their impacts had been attributed to other processes. Recently

Kenneth Hewitt

2009-01-01

149

The Chineysky layered massif (Siberia, Russia) and Upper Zone of the Bushveld Complex: resemblance and difference features  

Microsoft Academic Search

Layered intrusions represent a small part of a large group of continental basic-ultrabasic complexes. They attract geologists' attention due to their unusual magmatic structures and associated PGE, Cr and V deposits. The outstanding example of this phenomenon is the Bushveld Complex in South Africa. The largest layered intrusion in Russia is the Chineysky massif (Transbaikalia, Siberia). It is characterized by

B. Gongalskiy; N. Krivolutskaya

2009-01-01

150

Multicriterion validation of a semidistributed conceptual model of the water cycle in the Fecht Catchment (Vosges Massif, France)  

Microsoft Academic Search

Model validation is still a crucial issue in hydrology. It is usually limited to comparing simulated and measured streamflows, while many other fluxes and storages are also simulated. This is especially true for spatially distributed models, for which multivariable and multiscale validation procedures are needed. Such an approach has been tested on the Fecht research basin (Vosges Massif, France) over

B. Ambroise; J. L. Perrin; D. Reutenauer

1995-01-01

151

Two-dimensional geostatistical modeling and prediction of the fracture system in the Albala Granitic Pluton, SW Iberian Massif, Spain  

Microsoft Academic Search

We use a fracture index distribution method of geostatistical modelling and prediction to characterize quantitatively the fracture system in two-dimensions (2D) in the Mina Ratones area, located in the Albalá Granitic Pluton (SW Iberian Massif). The fracture index (FI) is a quantitative estimate of the fracture density in discrete domains. To validate the results of geostatistical modeling a detailed structural

J. Escuder Viruete; R. Carbonell; M. J. Jurado; D. Mart??; A. Pérez-Estaún

2001-01-01

152

The Toa Baja Drilling Project, Puerto Rico: Scientific drilling into a non-volcanic island arc massif  

SciTech Connect

The Toa Baja Drilling Project was a broad, interdisciplinary experiment to document the in situ geology and geophysics of a non-volcanic island arc massif. This overview provides a brief summary of oil exploration on Puerto Rico that lead up to the present investigation, and summarizes some of the problems addressed by drilling.

Larue, D.K. (Univ. of Puerto Rico, Mayaguez (Puerto Rico))

1991-03-01

153

Metal and macroelement concentration and effect of nutrient addition in terrestrial bryophytes growing on serpentine massifs in Lower Silesia, Poland  

Microsoft Academic Search

Concentrations of the elements N, P, K, Ca, Mg, S, Fe, Al, Ni, Co, Cr, Zn and Mn were measured in serpentine soils and in terrestrial mosses sampled from the serpentine massifs in Lower Silesia, Poland. The investigated soils were typical for serpentine areas: poor in N, K and Ca, and rich in Fe, Ni, Co, Cr and Zn. Concentrations

A. Samecka-Cymerman; A. Kempers; B. Winter

2002-01-01

154

Geochemical study of surface waters in mountain granitic area. The Iskar upper watershed: Massif of Rila, Bulgaria  

Microsoft Academic Search

The aim of this study is to determine the characteristics of the Iskar upper watershed surface waters as a first step of a seasonal evolution study. The geochemical and petrochemical characteristics of the Rila massif are well-suited to study the relative significance of different weathering mechanisms occurring along the year in a mountain aquatic system. In such an area the

Nathalie Gassama; Sophie Violette

1997-01-01

155

The Vercors and Chartreuse Massifs at the leading edge of the alpine thrust belt: Tetonic history and petroleum assessment  

SciTech Connect

The Vercors and Chartreuse Massifs are located at the leading edge of the Western Alps Thrust Belt. They developed in late Miocene-Pliocene times above a major decollement hosted in late Triassic evaporites and/or Liassic marls. The uplift of both massifs led to the oblique and partial inversion of the previous Mesozoic margin of the Southeastern Basin, the thickest onshore sedimentary basin in France. Both massifs are unexplored. The regional geology of eastern France and the results of ten wells located in the near foreland suggest that source rocks are present in late Paleozoic and late Liassic strata, and that fractured sandstones and/or limestones of Triassic/Jurassic age could act as reservoirs. A nonexclusive seismic survey has been shot in 1991 by CGG allowing the first well constrained balanced sections to be drawn across both massifs. They have been used inturn to model the forward kinematics of thrust propagation, and the source rock maturation history, using the {open_quotes}Thrustpack{close_quotes} software developed by IFP and partners.

Deville, E.; Mascle, A.; Philippe, Y. [Institut Francais du Petrole, Rueil-Malmaison (France)] [and others

1995-08-01

156

Seismic imaging of the western Iberian crust using ambient noise: Boundaries and internal structure of the Iberian Massif  

NASA Astrophysics Data System (ADS)

The Iberian Massif one of the major structural units of the Iberian Peninsula is composed by rocks with ages ranging from the Upper Precambrian to Upper Carboniferous. The massif outcrops in Central and Western Iberia and the location of its limits, as well as the relationship between its shallow and deeper structures are still a matter of debate. Several problems like source-receiver geometry, irregular seismicity distribution or, for some methods, low seismicity occurrence did not allow obtaining high-resolution models of Iberian structure using traditional imaging methods. Seismic interferometry/ambient noise surface-waves tomography allows imaging regions with a resolution that mainly depends on the seismic network coverage. This study aims to map the boundaries of the Iberian Massif particularly those that are covered or in contact with recent (Cenozoic) and older (Mesozoic) basins. Whenever possible, we intend to characterize second-order structures inside the Massif. We present new Rayleigh-wave dispersion maps of the western Iberian Peninsula for periods between 8 and 30 seconds, obtained from correlations of seismic ambient noise, following the recent increase in seismic broadband network density in Portugal and Spain. Group velocities have been computed for each station pair using the empirical Green's functions generated by cross-correlating one-day-length seismic ambient-noise records. The resulting high-path density allows us to obtain lateral variations of the group velocities as a function of period in cells of 0.5° x 0.5° with an unprecedented resolution. As a result we were able to address some of the unknowns regarding the lithospheric structure beneath SW Iberia. The dispersion maps allow the imaging of the major structural units, namely the Iberian Massif, and the Lusitanian and Algarve Meso-Cenozoic basins. The Cadiz Gulf/Gibraltar Strait area corresponds to a strong low-velocity anomaly, which can be followed to the largest period inverted, although slightly shifted to the east at longer periods. Within the Iberian Massif, second-order perturbations in the group velocities are consistent with the transitions between tectonic units composing the massif.

Silveira, Graça; Dias, Nuno; Villaseñor, Antonio

2013-04-01

157

Seabirds utilizing the Northeast Water polynya  

Microsoft Academic Search

A small seabird community depends on the resources of the Northeast Water (NEW) polynya. In spring, at least 1000 King Eiders and 2500 Common Eiders form pre-breeding congregations at Ob Bank before dispersing in mid June to breeding areas. The most abundant species is the Fulmar, which breeds in six colonies with a total of 2550 “apparently occupied sites”, corresponding

K. Falk; C. Hjort; C. Andreasen; K. D. Christensen; M. Elander; M. Ericson; K. Kampp; R. M. Kristensen; N. Møbjerg; S. Møller; J. M. Weslawski

1997-01-01

158

Rhizoctonia solani AG groups in northeast India  

Microsoft Academic Search

Rhizoctonia solani isolates collected from different crops in northeast India belonged to anastomosis group AG 2-2 IIIB (Canavalia ensiformis, Sechium edule, Glycine max and Dolichos lablab). AG 1-1A was detected on Zea mays, Rhizoctonia solani on Sechium edule and AG 4HG-II on a weed, Galinsoga parviflora, which are new records from India.

P. Baiswar; D. D. Rosa; S. Chandra; S. V. Ngachan

2010-01-01

159

Copper complexation in the Northeast Pacific  

Microsoft Academic Search

Copper titrations were conducted at sea with differential pulse anodic stripping voltammetry to examine the degree to which copper was associated with organic ligands. Greater than 99.7% of the total dissolved copper in surface waters of the central Northeast Pacific shallower than 200 m was estimated to be associated with strong organic complexes. Below 200 m, increasing proportions of inorganic

KENNETH H. COALE; KENNETH W. BRULAND

1988-01-01

160

COASTAL 2000 MONITORING IN THE NORTHEAST  

EPA Science Inventory

Coastal 2000 is a partnership between the U.S. Environmental Protection Agency and coastal states to develop a national coastal monitoring program. The Northeast portion of Coastal 2000 includes states from Delaware to Maine. This joint effort will provide a nationwide assessment...

161

A Northeast Asia nuclear weapon free zone  

Microsoft Academic Search

A subtle balance in public sentiment emerged in Japan about Northeast Asian regional security after a series of recent incidents related to the Democratic People's Republic of Korea (DPRK or North Korea). These incidents included the alleged construction of underground nuclear facilities, a surprise launch of a three?staged Taepodong missile or satellite over Japanese territory in August 1998, and the

Hiromichi Umebayashi

1999-01-01

162

Stratigraphic Cross Section of Northeast Texas  

NSDL National Science Digital Library

Cretaceous sedimentary rocks of Northeast Texas provide important clues about paleogeography, paleotectonics, and sea level fluctuation. This website describes several of these rock units and the geologic information they supply. An unpublished report with a thorough discussion, map, cross section, and numerous references is provided. Specific topics include Cretaceous stratigraphy, lithostratigraphic and biostratigraphic correlation, ammonites, Western Interior Seaway, Skull Creek Seaway, paleogeography, and paleotectonics.

Keith, Minor; Cretaceousfossils.com

163

Caregiving to the elderly in Northeast Thailand  

Microsoft Academic Search

Caregiving has been extensively explored in developed countries, but less so in developing regions. In Thailand, a rapidly expanding elderly population and a declining birthrate have important implications for future care of the elderly. This report is based on further exploration of data obtained from a larger study in rural Northeast Thailand of 89 households with elderly age 65 and

Rosalie A. Caffrey

1992-01-01

164

Cretaceous albitization and dequartzification of Hercynian peraluminous granite in the Salvezines Massif (French Pyrénées)  

NASA Astrophysics Data System (ADS)

The Salvezines Massif in northern French Pyrénées has undergone extensive albitization. The massif consists of gneisses and a leucogranite hosted in Paleozoic sediments (schists and carbonates). The leucogranite was emplaced at the end of the Hercynian orogeny. The granite underwent monazite fractionation during magmatic stages, which induced lowering of REE and Th contents in the most evolved rocks. Hydrothermal alteration during late magmatic stages is also identified through the development of a tetrad effect in the REE patterns of the granite and through the fractionation of ratios like Zr/Hf out of the CHARAC (CHarge RAdius Controlled) range. The granite underwent partial to complete sub-solidus albitization. Progressive metasomatic overprint induced metasomatic replacement of feldspars into albite and dissolution of quartz (episyenitization) together with new albite formation. Hydrothermal muscovite with a sheaf-like structure sometimes crystallised in albitites. Inherited muscovites from magmatic stage and newly formed muscovites from albitites have distinct chemical compositions with the latter being much more phengitic. The initial peraluminous chemistry of the leucogranite was lost during albitization and composition evolved towards a pure albite one (A/CNK = 1). Albitization induced gains in Na and Al, and losses in Si and K. Leaching of REE and U is also identified during albitization, as well as the non-CHARAC behaviour of some elements. ?18O values of quartz and muscovite in albitized granites are in the magmatic range (about 12 and 9.5‰, respectively). Feldspars acquired high ?18O values during albitization (up to 15‰). Muscovite grains from albitites have higher ?18O values than inherited ones and tend towards isotopic equilibrium with albite. The albitizing fluids have interacted with high-?18O rocks (probably local carbonates) prior to alter granite. Muscovites inherited from magmatic stages display very characteristic disturbed 39Ar 40Ar age spectra with saddle-shapes when a muscovite associated with albitization provided a plateau age at 117.5 Ma for this alteration event. Albitization in the Salvezines Massif just preceded the regional talc/chlorite hydrothermal mineralization. Both events might then represent two outward signs of a huge hydrothermal system at the time of the rotation of the Iberian plate around Europe. The North Pyrenean Metamorphism is identified by 39Ar 40Ar analyses at ca. or younger than 100 Ma.

Boulvais, Philippe; Ruffet, Gilles; Cornichet, Jean; Mermet, Maxime

2007-01-01

165

Remagnetization of Variscan massifs and reconstruction of the Triassic paleosurface in Europe  

NASA Astrophysics Data System (ADS)

Basement rocks (such as e.g. granites and rhyolithes) of European Variscan massifs often show Permo-Triassic remagnetization [e.g. Edel & Schneider, 1995, Geophys. J. Int., 122, 858-876; Edel et al., 1997, C.R.AS. Paris, Earth Planet. Sci., 325, 479-486] resulting in underestimated age determinations. These rejuvenated ages are attributed to an alteration of the primary paleomagnetic signal recently carried by the neo-formation of secondary hematite [Preeden et al., 2009, Geophys. Res. Abstr. EGU, 11, 365,]. Hematite forms under oxic conditions. Thus, one may deduce that the remagnetization of Paleozoic crystalline rocks occurs once the basement rocks are exposed at the Permo-Triassic (paleo)surface. Permo-Triassic remagnetizations are ubiquitous, affecting many emerged Paleozoic rocks in Europe and suggesting a major weathering event under oxic conditions. Previously published paleomagnetic ages [Ricordel et al., 2007, Palaeo3, 251, 268-282] showed a relationship between remagnetization and the development of pink-reddish facies associated to the albitized underlying rocks of the Morvan Massif (France). Parcerisa et al. [2009, Int. J. Earth Sci., doi: 10.1007/s00531-008-0405-1] performed further petrographic analyses and proposed a geochemical model for the genesis of this type of alteration. The extent of the altered zone (> 100 m in depth) points to a sodium enriched groundwater environment [Thiry et al., 2009, Geophs Res. Abstr. EGU, 11, 4103]. The Na+ enrichment is likely related to the Triassic environment characterized by widespread salt deposits, such as leaching of salt, marine aerosols, periodic/episodic contribution of seawater or evaporative solutions. Demonstrating that the albitized facies are of supergenic origin and bound to the Triassic paleosurface deeply renews the ideas about the evolution of basement areas. The recognition of the Triassic paleosurface on widespread basements in Europe will provide spatio-temporal benchmarks to constrain the ablation of these massifs since the Triassic. This will be a major contribution to the geodynamic modelling of these areas. To deepen our understanding of this paleoalteration phenomenon on a supra-regional scale, we aim to acquire more tie points for this Paleozoic surface, which was preserved in the crystalline basement of Europe throughout the Mesozoic and Cenozoic epoch. Therefore we will present results on paleomagnetic investigations as well as petrographic analyses of the profiles through albitized granite and porphyry from the Sudetes in SW-Poland and the Catalonian Mountains in NE-Spain.

Franke, C.; Thiry, M.; Jelenska, M.; Kodzialko-Hofmokl, M.; Lagroix, F.; Parcerisa, D.; Szuszkiewicz, A.; Turniak, K.

2009-12-01

166

Episodic early Miocene anatexis in the Ama Drime Massif, southern Tibet  

NASA Astrophysics Data System (ADS)

Cenozoic India-Asia collision resulted in profound crustal shortening and thickening that produced the Himalaya and Tibetan Plateau. However, extensional tectonics, represented by the E-W trending south Tibetan detachment system (STDS) and N-S trending normal faults, has been a salient feature of Himalayan geology since the Miocene. To the north of the Ama Drime Massif, the STDS is crosscut by N-S trending normal faults, which indicates that the earlier extensional deformation was overprinted by the E-W extension. In response to the extension, the Ama Drime Massif has experienced rapid exhumation and partial melting of fertile rocks due to decompressional melting. Near the northern tip of the Ama Drime Massif, SHRIMP ziron U/Pb data from leucogranites indicate two episodes of melting at 21.0±0.7 Ma and 15.8±0.1 Ma, respectively. These leucogranites have (1) high SiO2 (>72 wt%), Al2O3 (>12 wt%), and A/CNK (>1.0); (2) high Rb and low Sr, thus high Rb/Sr ratios (>1.0); (3) high contents of total REE, and substantial negative Eu anomalies; and (4) high initial Sr (87Sr/86Sr =0.7621~0.8845) and low Nd (?Nd(i) =-20.2~-13.0) isotopic compositions. As compared with those in the metapelite and granitic gneiss, these leucogranites could be produced from anatexis of a source mixed of metapelite with granitic gneiss. In addition, SHRIMP zircon U/Pb analyses on the granitic gneiss, garnet amphibolite and garnet pyroxenite yield 206Pb/238U ages at 22.6±1.6 Ma, 21.4±2.7 Ma and 16.0±0.2 Ma, respectively, which might represent timing of partial melting or retrograde metamorphic reaction due to the extension-related decompression. These new data suggest two episodes of crustal anatexis at ~21-22 Ma and ~16 Ma, respectively. The existence of two metamorphic episodes indicates that the older melting was associated with a high-grade metamorphism, whereas the younger was associated with a widespread retrograde metamorphism. Exhumation of deeply subducted crustal material not only caused the retrogressive metamorphism in the eclogite and metabasites, but also resulted in intensive anatexis of metapelite and granitic gneiss, probably due to heating during rapid exhumation of these high-grade rocks.

Yu, J.; Zeng, L.; Liu, J.; Gao, L.; Xie, K.

2010-12-01

167

Pyroclastic chronology of the Sancy stratovolcano (Mont-Dore, French Massif Central): New high-precision 40Ar/39Ar constraints  

NASA Astrophysics Data System (ADS)

The Sancy (16 km2) is the youngest of the two stratovolcanoes that constitute the Mont-Dore Massif (Massif Central, France). The restricted number of high precision radio-isotopic ages currently limits our knowledge of the pyroclastic chronology of this edifice which is the source of many tephra layers detected in middle Pleistocene sequences in southeast Europe. To improve our knowledge of the building phases of this stratovolcano, we collected thirteen pyroclastic units covering the entire proximal record. We present 40Ar/39Ar single grain laser dating performed in the facility hosted at the LSCE (Gif-sur-Yvette, France). The 40Ar/39Ar ages range from 1101 ± 11 ka to 392 ± 7 ka (1? external). Four pyroclastic cycles lasting on average 100 ka were identified (C. I to C. IV). C. I corresponds to the earlier explosive phase between 1101 ka and 1000 ka and starts about 100 ka earlier than previously thought. The second pyroclastic cycle (C. II) is the main pyroclastic episode spanning from 818 to 685 ka. This cycle is constituted of a minimum of 8 major pyroclastic eruptions and includes a major event that corresponds to a large plinian eruption at 719 ± 10 ka (1? external) and recorded as a 1.4 m thick layer 60 km south-east of the Sancy volcano. The link between this large eruption and formation of a caldera stays however, hypothetical. The third pyroclastic cycle (C. III) found in the northeastern part of the Sancy (Mont-Dore valley) spanned from 642 to 537 ka. Finally, the youngest pyroclastic cycle (C. IV) starts at 392 ka and probably ends around 280 ka. The age versus geographic location of each pyroclastic cycle indicates three preferential directions of channeling of the pyroclastic events and/or collapse of the volcanic edifice: northwest to west (C. I), southeast (C. II) and finally north to northeast (C. III and IV). The new high precision 40Ar/39Ar age for the Queureuilh bas pyroclastic unit (642 ± 9 ka) is identical within error with the U/Pb age obtained by Cocherie et al. (2009) [Geochimica et Cosmochimica Acta, 73, 1095-1108] and suggests a short residence time of the magma in a shallow, short-lived, small magmatic chamber. Finally, the source of the t21d tephra layer found in the Piànico Séllere varved sequence (Northern Italy) is not the Rivaux pumice flow as proposed by Brauer et al. (2007) [Journal of Quaternary Science 22, 85-96] and neither one of the C. II pyroclastic units as suggested by Roulleau et al. (2009) [Quaternary International 204, 31-43]. Accordingly, the source for the t21d layer has yet to be found at Sancy or elsewhere.

Nomade, Sébastien; Scaillet, Stéphane; Pastre, Jean-François; Nehlig, Pierre

2012-05-01

168

Crystal structure of hydrogen-bearing vuonnemite from the Lovozero alkaline massif  

SciTech Connect

Hydrogen-bearing vuonnemite from the Shkatulka hyperagpaitic pegmatite (the Lovozero alkaline massif, Kola Peninsula) was studied by single-crystal X-ray diffraction. The triclinic unit-cell parameters are as follows: a = 5.4712(1) Angstrom-Sign , b = 7.1626(1) Angstrom-Sign , c = 14.3702(3) Angstrom-Sign , {alpha} = 92.623(2) Degree-Sign , {beta} = 95.135(1) Degree-Sign , {gamma} = 90.440(1) Degree-Sign , sp. gr. P1, R = 3.4%. The Na{sup +} cations and H{sub 2}O molecules are ordered in sites between the packets. The water molecules are hydrogen bonded to the PO{sub 4} tetrahedra.

Rastsvetaeva, R. K., E-mail: rast@ns.crys.ras.ru; Aksenov, S. M.; Verin, I. A. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Lykova, I. S. [Moscow State University (Russian Federation)

2011-05-15

169

Oxidation state of the lithospheric mantle beneath the Massif Central,France  

NASA Astrophysics Data System (ADS)

The Tertiary and Quaternary volcanism of the French Massif Central sampled the underlying subcontinental lithospheric mantle (SCLM) in the form of xenoliths over a wide geographic area of ~20.000km2. Such an extensive distribution of xenoliths provides an unique opportunity to investigate regional variations in mantle structure and composition. On the basis of textural and geochemical differences, Lenoir et al. (2000) and later Downes et al. (2003) identified two distinct domains in the SCLM lying north and south of latitude 45° 30' N, respectively. The northern domain is relatively refractory, but has experienced pervasive enrichment of LREE. The southern domain is generally more fertile, exhibiting depletion in LREE. A metasomatic overprint has developed to variable extents in many xenolith suites. The different histories of these two juxtaposed blocks of SCLM should also be reflected in their oxidation state, with local variations also to be expected due to metasomatic interactions. For example, if carbonate-melt metasomatism played a role in the LREE enrichment of the northern domain (Lenoir et al. 2000; Downes et al. 2003), then such mantle should be relatively oxidised. Since surprisingly little redox data are currently available, we are undertaking a study to determine the oxidation state of the SCLM beneath the Massif Central over the largest geographical area possible. All xenoliths investigated are spinel peridotites, mostly with protogranular textures (although some samples are porphyroclastic or equigranular). Most samples are nominally anhydrous although minor amphibole is present in some xenolith suites. Major element compositions of the individual minerals were determined by microprobe. Two-pyroxene temperatures (BKN) range from 750° to ~1200° C. Ferric iron contents of spinel were determined by Mössbauer spectroscopy and gave a range of Fe3+/ Fetot from 0.191 to 0.418, with a conservative uncertainty of ±0.02. These data were used to calculate oxygen fugacity (fO2) of the peridotites using the Nell-Wood calibration for the equilibrium between olivine, orthopyroxene and spinel (Wood et al. 1990) and are referenced to the fayalite-magnetite-quartz (FMQ) redox buffer. Preliminary results yield ?log(fO2) values between FMQ-0.17 and FMQ+1.65 log units. In this fO2 range propagated uncertainties are on the order of 0.1 log units. Although there is some overlap, localities from the northern block tend to record higher values (>FMW+0.9). In the south, fO2values from a number of localities cluster around FMQ+0.3 to FMQ+0.6, with higher values associated with the occurrence of amphibole in the xenoliths. The higher values (>FMQ+1) testify to localised metasomatic interaction in the SCLM, possibly related to melt migration during earlier phases of magmatic activity in the region. This hypothesis is also consistent with lower fO2 values observed at one locality (Fraisse) on the northern block that is significantly older and thus sampled the mantle prior to the subsequent metasomatic activity in this block of SCLM. Downes H., Reichow M.K., Mason P.R.D., Beard A.D., Thirlwall M.F. (2003) Mantle domains in the lithosphere beneath the French Massif Central: trace element and isotopic evidence from mantle clinopyroxenes. Chem. Geol., 200, 71-87. Lenoir, X., Garrido, C.J., Bodinier, J.-L., Dautria, J.-M. (2000) Contrasting lithospheric mantle domains beneath the Massif Central (France) revealed by geochemistry of peridotite xenoliths. Earth Planet. Sci. Lett. 181, 359-375. Wood B.J., Bryndzia L.T., Johnson K.E. (1990) Mantle oxidation state and its relation to tectonic environment. Science, 248, 337-345.

Uenver-Thiele, L.; Woodland, A. B.; Downes, H.; Altherr, R.

2012-04-01

170

Method of determining the vertical seismic profile of a rock massif using Rayleigh-type waves  

NASA Astrophysics Data System (ADS)

A method is substantiated for calculating the vertical seismic profile using Rayleigh polarization waves recorded on the surface, which occur during the interaction of P and SV waves localized in the heterogeneous half-space. The method makes it possible to solve the inverse problem of finding the velocities of longitudinal and transverse waves in the massif with the number of calculated points achieving 400. An algorithm of the method is presented which envisages application of multimode dispersion analysis and computation of reference points for the wave velocity in B.M. Levitan algebraic polynomials. The possibilities of the method are illustrated by examples of using it to study model objects, as well as by results of comparing microseismic exploration data.

Zagorskii, L. S.; Shkuratnik, V. L.

2013-03-01

171

Kinematics of a kilometric recumbent fold: The Courel syncline (Iberian massif, NW Spain)  

NASA Astrophysics Data System (ADS)

The Courel recumbent syncline is one of the best examples of a regional scale recumbent fold outcropping in the NW Iberian massif. A strain, microfabric and minor fold analysis of this structure has been integrated in an evolutionary model that begins with an episode of layer shortening, buckling and body rotation associated with deformation dominated by simple shear. Subsequently, the fold was flattened by dominant irrotational strain with maximum shortening perpendicular to the axial surface and maximum stretching parallel to the fold axis. This occurred during the first phase of the Variscan deformation, and gave rise to a fold with an axial surface dipping moderately towards the hinterland (SSW). The recumbent character of the fold was increased during the third phase of the Variscan deformation, which produced a large-scale open structure with a subhorizontal limb.

Fernández, Francisco J.; Aller, Jesus; Bastida, Fernando

2007-10-01

172

The cooling history and the depth of detachment faulting at the Atlantis Massif oceanic core complex  

NASA Astrophysics Data System (ADS)

Oceanic core complexes (OCCs) are domal exposures of oceanic crust and mantle interpreted to be denuded to the seafloor by large slip oceanic detachment faults. We combine previously reported U-Pb zircon crystallization ages with (U-Th)/He zircon thermochronometry and multicomponent magnetic remanence data to determine the cooling history of the footwall to the Atlantis Massif OCC (30°N, MAR) and help establish cooling rates, as well as depths of detachment faulting and gabbro emplacement. We present nine new (U-Th)/He zircon ages for samples from IODP Hole U1309D ranging from 40 to 1415 m below seafloor. These data paired with U-Pb zircon ages and magnetic remanence data constrain cooling rates of gabbroic rocks from the upper 800 m of the central dome at Atlantis Massif as 2895 (+1276/-1162) °C Myr-1 (from ˜780°C to ˜250°C); the lower 600 m of the borehole cooled more slowly at mean rates of ˜500 (+125/-102) °C Myr-1(from ˜780°C to present-day temperatures). Rocks from the uppermost part of the hole also reveal a brief period of slow cooling at rates of ˜300°C Myr-1, possibly due to hydrothermal circulation to ˜4 km depth through the detachment fault zone. Assuming a fault slip rate of 20 mm/yr (from U-Pb zircon ages of surface samples) and a rolling hinge model for the sub-surface fault geometry, we predict that the 780°C isotherm lies at ˜7 km below the axial valley floor, likely corresponding both to the depth at which the semi-brittle detachment fault roots and the probable upper limit of significant gabbro emplacement.

Schoolmeesters, Nicole; Cheadle, Michael J.; John, Barbara E.; Reiners, Peter W.; Gee, Jeffrey; Grimes, Craig B.

2012-10-01

173

Fluctuation of sediment production during the last millennia in the Ardenne Massif (Belgium)  

NASA Astrophysics Data System (ADS)

In the Ardenne massif, floodplains have recorded fluctuations in the production of sediment and several periods of increased sediment deposition have been identified. Before the first deforestations rivers developed multiple channels in alluvial forests. Floodplains were not well-developed and probably very humid, which explains the presence of peat layers within the alluvial sequences. In the Amblève catchment, the first increased sedimentary deposition of the Holocene occurred during the Bronze Age (3200 BP), in relation to deforestation and the first crop cultures in the area. An organic deposition has occurred around 2700 BP and could correspond with a period of climatic degradation. Several peat layers have also been dated to around 1000 BP and probably indicate very low anthropogenic pressure. From the 11th Century onwards, there was an increase in sedimentation and a greater concentration of charcoal is present in the alluvial deposits. In many catchments there is an important increase in the sedimentation at the end of the 14th century, which can be related to the development of many iron factories. Analyses of slag concentration produced in these former factories allow us to reconstruct the evolution of the floodplain topography since the inception of the iron industries, in relation to the periods of activity. Total sedimentation in the smaller valleys since the initiation of iron industries amounts 0.5 to 1.0 m, which is in most cases about 50% of the total sediment present in the floodplains and corresponds to a mean sedimentation rate ranging between 10 and 20 cm/century. Such values are explained by various former agricultural practises and forest clearings associated with the huge demand for charcoal by the iron industry. About 20 ha of forest were cleared for the yearly consumption of a refining forge or a blast furnace and more than three hundred iron factories existed in the Ardenne Massif between the 14th and the 19th century.

Houbrechts, G.; Notebaert, B.; Petit, F.; Verstraeten, G.

2009-04-01

174

Cenozoic Extension of the Southern Menderes Massif along the Kayabuku Shear Zone, Western Anatolia Extended Terrane, Turkey  

NASA Astrophysics Data System (ADS)

Four major low angle extensional shear zones are located in the Menderes massif of the Western Anatolia Extended Terrane in western Turkey. The shear zones are, from north to south, Simav, Alasehir, Buyuk Menderes and Kayabuku (Selimiye) shear zones. We have conducted a detailed field oriented study to determine the role of the Kayabuku (Selimiye) shear zone in the Cenozoic extensional evolution of the Menderes massif. The south-dipping Kayabuku (Selimiye) shear zone of the southern Menderes massif contains well- developed mesoscopic and microscopic shear sense indicators, and separates orthogneiss and augengneiss in its footwall from schist and marble rock units in its hanging wall. Within the shear zone, the average attitude of the foliation planes between the towns of Milas and Yatagan is measured as N86W/50°S. The shear zone shows two ductile sense of shearing; 1) top to the north and 2) top to the south which overprinted the former one. Many thin sections also show top to the south brittle shear sense indicators overprinting the ductile shear sense indicators. The trend of the ductile shear sense indicators, such as stretching lineations, range from N10E to N30E indicating that they are parallel to the shear sense indicators measured along the Simav shear zone of the northern and, Alasehir and Buyuk Menderes shear zones of the central Menderes massif. This suggests to us that the Cenozoic extension which was initiated in Oligocene by the processes of Orogenic Collapse effected the Kayabuku (Selimiye) shear zone. The hanging wall of the Kayabuku shear zone is also locally brittely deformed by a south-dipping normal fault zone, discontinuously exposed between the schist and marble units. The fault zone suggests that the hanging wall of the shear zone has been brittely deformed during the extensional exhumation of the southern Menderes massif. Our field observations and microtectonic studies suggest that the rocks within the Kayabuku (Selimiye) shear zone gained their shear sense indicators within the large Oligocene top to the north simple-shear extensional shear zone. As the extensional exhumation of the southern Menderes massif progressed, the shear zone developed top to the south ductile and brittle shear sense indicators, suggesting that the shear zone has been subjected to at least two different deformation phases.

Diniz, E.; Cemen, I.; Catlos, E. J.; Konak, N.; Goncuoglu, C. M.; Kohn, M. J.; Baker, C.; Hancer, M.

2006-12-01

175

Late-orogenic Sveconorwegian massif anorthosite in the Jotun Nappe Complex, SW Norway, and causes of repeated AMCG magmatism along the Baltoscandian margin  

Microsoft Academic Search

The age and tectonometamorphic history of massif anorthosite in the Jotun Nappe Complex, SW Norway, were investigated by zircon\\u000a and titanite U–Pb ID-TIMS. The anorthosite contains sparse zircons showing complex U–Pb systematics reflecting events dated\\u000a at 965 ± 4 and 913 ± 2 Ma, and a pronounced Caledonian metamorphic overprint. The oldest age is interpreted as the protolith\\u000a age of the massif anorthosite. We propose

A. M. Lundmark; F. Corfu

2008-01-01

176

New insights into the history and origin of the southern Maya block, SE México: U-Pb-SHRIMP zircon geochronology from metamorphic rocks of the Chiapas massif  

NASA Astrophysics Data System (ADS)

The histories of the pre-Mesozoic landmasses in southern México and their connections with Laurentia, Gondwana, and among themselves are crucial for the understanding of the Late Paleozoic assembly of Pangea. The Permian igneous and metamorphic rocks from the Chiapas massif as part of the southern Maya block, México, were dated by U-Pb zircon geochronology employing the SHRIMP (sensitive high resolution ion microprobe) facility at Stanford University. The Chiapas massif is composed of deformed granitoids and orthogneisses with inliers of metasedimentary rocks. SHRIMP data from an anatectic orthogneiss demonstrate that the Chiapas massif was part of a Permian (˜ 272 Ma) active continental margin established on the Pacific margin of Gondwana after the Ouachita orogeny. Latest Permian (252-254 Ma) medium- to high-grade metamorphism and deformation affected the entire Chiapas massif, resulting in anatexis and intrusion of syntectonic granitoids. This unique orogenic event is interpreted as the result of compression due to flat subduction and accretionary tectonics. SHRIMP data of zircon cores from a metapelite from the NE Chiapas massif yielded a single Grenvillian source for sediments. The majority of the zircon cores from a para-amphibolite from the SE part of the massif yielded either 1.0-1.2 or 1.4-1.5 Ga sources, indicating provenance from South American Sunsás and Rondonian-San Ignacio provinces.

Weber, Bodo; Iriondo, Alexander; Premo, Wayne R.; Hecht, Lutz; Schaaf, Peter

2007-04-01

177

The Death Penalty in the Northeast  

Microsoft Academic Search

This paper will provide an overview of the current status of capital punishment in the Northeastern United States. Of the nine states which comprise the Northeast (based on the U.S. Bureau of the Census designation), five have the death penalty (Connecticut, New Hampshire, New Jersey, New York, and Pennsylvania) and four-as of January 1, 1999—do not (Maine, Massachusetts, Rhode Island,

Charles S. Lanier

1999-01-01

178

Extension in Mona Passage, Northeast Caribbean  

Microsoft Academic Search

As shown by the recent Mw 7.0 Haiti earthquake, intra-arc deformation, which accompanies the subduction process, can present seismic and tsunami hazards to nearby islands. Spatially-limited diffuse tectonic deformation within the Northeast Caribbean Plate Boundary Zone likely led to the development of the submerged Mona Passage between Puerto Rico and the Dominican Republic. GPS geodetic data and a moderate to

Jason D. Chaytor; Uri S. ten Brink

2010-01-01

179

Early Holocene M~6 explosive eruption from Plosky volcanic massif (Kamchatka) and its tephra as a link between terrestrial and marine paleoenvironmental records  

NASA Astrophysics Data System (ADS)

We report tephrochronological and geochemical data on early Holocene activity from Plosky volcanic massif in the Kliuchevskoi volcanic group, Kamchatka Peninsula. Explosive activity of this volcano lasted for ~1.5 kyr, produced a series of widely dispersed tephra layers, and was followed by profuse low-viscosity lava flows. This eruptive episode started a major reorganization of the volcanic structures in the western part of the Kliuchevskoi volcanic group. An explosive eruption from Plosky (M~6), previously unstudied, produced tephra (coded PL2) of a volume of 10-12 km3 (11-13 Gt), being one of the largest Holocene explosive eruptions in Kamchatka. Characteristic diagnostic features of the PL2 tephra are predominantly vitric sponge-shaped fragments with rare phenocrysts and microlites of plagioclase, olivine and pyroxenes, medium- to high-K basaltic andesitic bulk composition, high-K, high-Al and high-P trachyandesitic glass composition with SiO2 = 57.5-59.5 wt%, K2O = 2.3-2.7 wt%, Al2O3 = 15.8-16.5 wt%, and P2O5 = 0.5-0.7 wt%. Other diagnostic features include a typical subduction-related pattern of incompatible elements, high concentrations of all REE (>10× mantle values), moderate enrichment in LREE (La/Yb ~ 5.3), and non-fractionated mantle-like pattern of LILE. Geochemical fingerprinting of the PL2 tephra with the help of EMP and LA-ICP-MS analyses allowed us to map its occurrence in terrestrial sections across Kamchatka and to identify this layer in Bering Sea sediment cores at a distance of >600 km from the source. New high-precision 14C dates suggest that the PL2 eruption occurred ~10,200 cal BP, which makes it a valuable isochrone for early Holocene climate fluctuations and permits direct links between terrestrial and marine paleoenvironmental records. The terrestrial and marine 14C dates related to the PL2 tephra have allowed us to estimate an early Holocene reservoir age for the western Bering Sea at 1,410 ± 64 14C years. Another important tephra from the early Holocene eruptive episode of Plosky volcano, coded PL1, was dated at 11,650 cal BP. This marker is the oldest geochemically characterized and dated tephra marker layer in Kamchatka to date and is an important local marker for the Younger Dryas—early Holocene transition. One more tephra from Plosky, coded PL3, can be used as a marker northeast of the source at a distance of ~110 km.

Ponomareva, Vera; Portnyagin, Maxim; Derkachev, Alexander; Pendea, I. Florin; Bourgeois, Joanne; Reimer, Paula J.; Garbe-Schönberg, Dieter; Krasheninnikov, Stepan; Nürnberg, Dirk

2013-04-01

180

Early Holocene M~6 explosive eruption from Plosky volcanic massif (Kamchatka) and its tephra as a link between terrestrial and marine paleoenvironmental records  

NASA Astrophysics Data System (ADS)

We report tephrochronological and geochemical data on early Holocene activity from Plosky volcanic massif in the Kliuchevskoi volcanic group, Kamchatka Peninsula. Explosive activity of this volcano lasted for ~1.5 kyr, produced a series of widely dispersed tephra layers, and was followed by profuse low-viscosity lava flows. This eruptive episode started a major reorganization of the volcanic structures in the western part of the Kliuchevskoi volcanic group. An explosive eruption from Plosky (M~6), previously unstudied, produced tephra (coded PL2) of a volume of 10-12 km3 (11-13 Gt), being one of the largest Holocene explosive eruptions in Kamchatka. Characteristic diagnostic features of the PL2 tephra are predominantly vitric sponge-shaped fragments with rare phenocrysts and microlites of plagioclase, olivine and pyroxenes, medium- to high-K basaltic andesitic bulk composition, high-K, high-Al and high-P trachyandesitic glass composition with SiO2 = 57.5-59.5 wt%, K2O = 2.3-2.7 wt%, Al2O3 = 15.8-16.5 wt%, and P2O5 = 0.5-0.7 wt%. Other diagnostic features include a typical subduction-related pattern of incompatible elements, high concentrations of all REE (>10× mantle values), moderate enrichment in LREE (La/Yb ~ 5.3), and non-fractionated mantle-like pattern of LILE. Geochemical fingerprinting of the PL2 tephra with the help of EMP and LA-ICP-MS analyses allowed us to map its occurrence in terrestrial sections across Kamchatka and to identify this layer in Bering Sea sediment cores at a distance of >600 km from the source. New high-precision 14C dates suggest that the PL2 eruption occurred ~10,200 cal BP, which makes it a valuable isochrone for early Holocene climate fluctuations and permits direct links between terrestrial and marine paleoenvironmental records. The terrestrial and marine 14C dates related to the PL2 tephra have allowed us to estimate an early Holocene reservoir age for the western Bering Sea at 1,410 ± 64 14C years. Another important tephra from the early Holocene eruptive episode of Plosky volcano, coded PL1, was dated at 11,650 cal BP. This marker is the oldest geochemically characterized and dated tephra marker layer in Kamchatka to date and is an important local marker for the Younger Dryas—early Holocene transition. One more tephra from Plosky, coded PL3, can be used as a marker northeast of the source at a distance of ~110 km.

Ponomareva, Vera; Portnyagin, Maxim; Derkachev, Alexander; Pendea, I. Florin; Bourgeois, Joanne; Reimer, Paula J.; Garbe-Schönberg, Dieter; Krasheninnikov, Stepan; Nürnberg, Dirk

2013-09-01

181

Thermochronological record of long term faulting, burial and exhumation history in the Sudetes (Bohemian Massif, Central Europe): a multi-system thermochronological approach  

NASA Astrophysics Data System (ADS)

Reconstructing erosional and faulting history in the old crystalline basement terrains, with lacking or sparse post-tectonic geological records, is a challenging task where even radiometric data on the basement rocks need not to provide ultimate answers. NE part of the Bohemian Massif (known as the Sudetes) represents a classic example where numerous attempts to constrain denudation, faulting and relief formation on the Variscan basement, often based on incomplete lines of evidence, led to formulation of controversial models. In this study we aim to reconstruct the post-orogenic exhumation history of the Rychlebské hory Mts. in the eastern Sudetes and constrain paleo-activity along the Sudetic Marginal Fault (SMF) - one of the morphologically most prominent, but poorly understood features of Central Europe, forming a >140 km long escarpment separating the Sudetic Mountains from the foreland in the northeast. We do so by applying zircon (U-Th)/He (ZHe), apatite fission track (AFT) and apatite (U-Th)/He (AHe) dating methods to the basement samples from different fault-bounded blocks and sparsely preserved post-orogenic sedimentary samples. New thermochronological data reveals that in the Late Cretaceous at ~95-80 Ma, the Carboniferous-Permian basement blocks SW and NE of the SMF were buried to ~4-7 km and >6.5 km depths, respectively, by sediments of the Bohemian Cretaceous Basin System. This finding contradicts the traditional paleogeographic reconstructions suggesting exposure of large portions of the Sudetes for most of the Mesozoic-Cenozoic. During the burial, the SMF acted as a normal fault as documented by offset in ZHe ages across the fault. At 85-70 Ma, the basin was inverted, Cretaceous strata eroded and basement blocks were exhumed to the near-surface at exhumation rate of ~300 m/Ma as evidenced by Late Cretaceous-Paleocene AFT ages and thermal modelling results. There is no appreciable difference in AFT and AHe ages across the fault suggesting that the SMF acted as a reverse fault during the exhumation. In the Late Eocene-Oligocene, the basement was locally heated to <~70°C in a response to thermal activity related to opening of the Eger rift system and associated magmatism. No signal of Neogene or Quaternary thermal activity in the thermochronological data confirms that Late Cenozoic uplift and erosion of the basement blocks resulting in the present-day topography did not exceed ~1.5 kilometres in the study area. This study highlights the importance of mutli-system thermochronological applications and the critical role of post-tectonic sediments in reconstructing histories of old crystalline basement terrain. More details can be found in Danišík et al. (2012).

Št?pan?íková, P..; Danišík, M.; Evans, N. J.

2012-04-01

182

Foraminiferal and radiolarian biostratigraphy of the youngest (Late Albian through Late Cenomanian) sediments of the Tatra massif, Central Western Carpathians  

NASA Astrophysics Data System (ADS)

B?k, K. and B?k M. 2013. Foraminiferal and radiolarian biostratigraphy of the youngest (Late Albian through Late Cenomanian) sediments of the Tatra massif, Central Western Carpathians. Acta Geologica Polonica, 63 (2), 223-237. Warszawa. The foraminiferal and radiolarian biostratigraphy of selected sections of the Zabijak Formation, the youngest sediments of the Tatra massif (Central Western Carpathians), have been studied. Benthic foraminifers, mainly agglutinated species, occur abundantly and continuously throughout the studied succession, while planktic foraminifers are generally sparse. Five planktic and two benthic foraminiferal zones have been recognized. The marly part of the Zabijak Formation comprises the Pseudothalmanninella ticinensis (Upper Albian) through the Rotalipora cushmani (Upper Cenomanian) planktic foraminiferal zones, and the Haplophragmoides nonioninoides and Bulbobaculites problematicus benthic foraminiferal zones. The radiolarians were recognized exclusively in the Lower Cenomanian part of the formation.

B?k, Krzysztof; B?k, Marta

2013-06-01

183

Pre-Variscan geological events in the Austrian part of the Bohemian Massif deduced from U–Pb zircon ages  

Microsoft Academic Search

In an attempt to elucidate the pre-Variscan evolution history of the various geological units in the Austrian part of the Bohemian Massif, we have analysed zircons from 12 rocks (mainly orthogneisses) by means of SHRIMP, conventional multi-grain and single-grain U–Pb isotope-dilution\\/mass-spectrometry. Two of the orthogneisses studied represent Cadomian metagranitoids that formed at ca. 610 Ma (Spitz gneiss) and ca. 580 Ma (Bittesch

Gertrude Friedl; Fritz Finger; Jean-Louis Paquette; Albrecht von Quadt; Neal J. McNaughton; Ian R. Fletcher

2004-01-01

184

Carbonate alteration associated with talc-chlorite mineralization in the eastern Pyrenees, with emphasis on the St. Barthelemy Massif  

Microsoft Academic Search

Summary  The eastern Pyrenees host a large number of talc-chlorite mineralizations of Albian age (112–97?Ma), the largest of which\\u000a occur in the St. Barthelemy massif. There talc develops by hydrothermal replacement of dolostones, which were formed by alteration\\u000a of calcite marbles. This alteration is progressive. Unaltered calcite marbles have oxygen isotope composition of about 25‰\\u000a (V-SMOW). The ?18O values decrease down

P. Boulvais; P. de Parseval; A. D’Hulst

2006-01-01

185

Late Pan-African magmatism in northeastern China: SHRIMP U–Pb zircon evidence from granitoids in the Jiamusi Massif  

Microsoft Academic Search

We present the first evidence of late Pan-African magmatism in the Jiamusi Massif of northeastern China. Recent SHRIMP U–Pb zircon studies of the Mashan Complex have identified a major ?500Ma granulite facies metamorphic event in the area, but no older igneous rocks have previously been dated. Two granitoid samples have been analysed using SHRIMP U–Pb zircon techniques: a deformed granitoid

Simon A. Wilde; Fuyuan Wu; Xingzhou Zhang

2003-01-01

186

35 Ma old ultrahigh-pressure metamorphism and evidence for very rapid exhumation in the Dora Maira Massif, Western Alps  

Microsoft Academic Search

Ion microprobe (SHRIMP) data on zircons from various rock types of an ultrahigh-pressure (UHP) metamorphic whiteschist-type pyrope quartzite lens of the Dora Maira Massif (DMM) consistently show domains giving a Late Eocene age of 35.4 ± 1.0 Ma which is taken as the age of UHP metamorphism. These domains partially replace the older oscillatory zoning pattern of the zircons formed

D. Gebauer; H.-P. Schertl; M. Brix; W. Schreyer

1997-01-01

187

The origin and formation of metamorphic microdiamonds from the Kokchetav massif, Kazakhstan: a nitrogen and carbon isotopic study  

Microsoft Academic Search

This study reports ?13C, ?15N and N-content values for microdiamonds from ultrahigh-pressure metamorphic rocks of the Kokchetav massif in Kazakhstan. Both alluvial diamonds and in-situ diamonds from a garnet–clinopyroxene rock and a marble (i.e. a garnet–pyroxene dolomitic rock) were investigated. In-situ diamonds were analysed in batches, because of their small size (average 40 ?m), whereas the larger alluvial diamonds were

Pierre Cartigny; Katrien De Corte; Vladislav S Shatsky; Magali Ader; Paul De Paepe; Nikolay V Sobolev; Marc Javoy

2001-01-01

188

New insights into serpentinization at Atlantis Massif, 30° N Mid-Atlantic Ridge, using wide-angle seismic method  

Microsoft Academic Search

The Atlantis Massif is an ultramafic core complex that was formed in the last 1.5-2.0 Myr at the intersection of the Atlantis Fracture Zone and the Mid-Atlantic Ridge near 30° N by tectonic extension along a long-lived oceanic detachment fault. The exhumation of deep crustal and upper mantle rocks in the footwall of the fault provides an excellent tectonic window

S. C. Singh; J. A. Collins; J. P. Canales; B. E. Tucholke; R. S. Detrick

2004-01-01

189

Massification, bureaucratization and questing for “world-class” status : Higher education in China since the mid-1990s  

Microsoft Academic Search

Purpose – This article aims to review the latest developments of the higher education sector in China since the mid-1990s by focusing on the expansion of university education. Design\\/methodology\\/approach – It is argued that while massification of higher education is an important indication of the progress in China's higher education system, the quest for world-class universities indicates China's ambition to

Kinglun Ngok

2008-01-01

190

Igneous scapolite-bearing associations in the Chaîne des Puys, Massif Central (France) and Atakor (Hoggar, Algeria)  

Microsoft Academic Search

A scapolite+amphibole+clinopyroxene+Fe-Ti oxide+apatite association has been found as megacrysts in tephra from the Enval-Volvic volcanic line, east of the Chaîne des Puys (Massif Central, France) and in the cinder cone of the Segueïka volcano (Atakor, Algeria). In both kinds, lavahosts are basanites. Although never seen together in a single xenolith, a study of their inclusions indicates close genetic relationship between

P. Boivin; G. Camus

1981-01-01

191

Seismic imaging of the western Iberian crust using ambient noise: Boundaries and internal structure of the Iberian Massif  

NASA Astrophysics Data System (ADS)

We present new Rayleigh-wave dispersion maps of the western Iberian Peninsula for periods between 8 and 30 s, obtained from correlations of seismic ambient noise, following the recent increase in seismic broadband network density in Portugal and Spain. Group velocities have been computed for each station pair using the empirical Green's functions generated by cross-correlating one-day-length seismic ambient-noise records. The resulting high-path density allows us to obtain lateral variations of the group velocities as a function of period in cells of 0.5° × 0.5° with an unprecedented resolution. As a result we were able to address some of the unknowns regarding the lithospheric structure beneath SW Iberia. The dispersion maps allow the imaging of the major structural units, namely the Iberian Massif, and the Lusitanian and Algarve Meso-Cenozoic basins. The Cadiz Gulf/Gibraltar Strait area corresponds to a strong low-velocity anomaly, which can be followed to the largest period inverted, although slightly shifted to the east at longer periods. Within the Iberian Massif, second-order perturbations in the group velocities are consistent with the transitions between tectonic units composing the massif.

Silveira, Graça; Afonso Dias, Nuno; Villaseñor, Antonio

2013-03-01

192

Pyroxenite Formation in the Totalp Ultramafic Massif, Switzerland: Constraints From Highly Siderophile Elements  

NASA Astrophysics Data System (ADS)

Pyroxenite layers form up to 5% of orogenic ultramafic massifs and may contribute significantly to formation of basaltic melt in the mantle. The processes which lead to the formation of pyroxenite layers are still subject to discussion. While a number of studies consider them high-pressures cumulate precipitates from mantle melts, other studies suggest an origin as residues from subducted slabs of recycled oceanic lithosphere. Understanding the genesis of pyroxenite layers in the mantle may be key to a better understanding of element fluxes and redistribution of elements during melt-rock interaction in the mantle. We present highly siderophile element (HSE) and Os isotope data from spinel and spinel-garnet websterites and clinopyroxenites interlayered with fertile serpentinized peridotites in the Totalp ultramafic massif in eastern Switzerland. The Totalp massif has its origin in the suboceanic MORB source mantle, followed by an episode of refertilization by melt-rock interaction. The pyroxenitic layers possibly represent zones of high melt flow during the refertilization event. Rapid uplift prior to emplacement on the Jurassic Piedmont-Liguria ocean floor in an ultraslow-spreading environment, similar to the present day Gakkel Ridge, prevented equilibration in the shallower mantle and allows study of a section of deep oceanic lithospheric mantle. Highly siderophile elements and Os isotopes have been useful tools for the study of mantle processes such as melt-rock interaction, because of their range in compatibility and their siderophile and chalcophile geochemical behavior. Totalp pyroxenites are depleted in the compatible HSE Os, Ir, and Ru compared to typical mantle lherzolites, along with enrichment in the more incompatible HSE Pt, Pd, and Re. The resulting HSE patterns from clinopyroxenites and some websterites are broadly similar to those seen in basalts, with high Re/Os, Pt/Ir and Pd/Ir. Several websterites from composite websterite-lherzolite samples are less depleted in Os, Ir and Ru, and show enrichment of Pt and Pd over Re. Bulk 187Os/188Os in websterites ranges from 0.1240 to 0.1607. Clinopyroxenites show more radiogenic values between 0.152 and 2.2. The observed HSE signatures are consistent with a cumulate origin of Totalp pyroxenites in zones of increased melt flow during melt-rock interaction near the lithosphere-asthenosphere boundary. Totalp pyroxenites can be considered mixtures between cumulates from infiltrating melts of broadly basaltic composition and up to 30% of depleted peridotite wall rock. Websterites represent the fringes of these high melt flow zones adjacent to peridotite wall rock, while clinopyroxenites almost exclusively preserve the HSE signature of the melt, with little influence from the peridotite host rock. Radiogenic 187Os/188Os of the pyroxenites suggests derivation of the parental melts from a source with a long-term enrichment in Re/Os, such as recycled oceanic crust.

van Acken, D.; Becker, H.; Walker, R. J.; Wombacher, F.

2009-12-01

193

Dynamics of melt extraction channels? Evidence from the Beni Bousera ultramafic massif. (Invited)  

NASA Astrophysics Data System (ADS)

Buoyancy driven mantle diapirism associated with the presence of melt is an old concept that has been recently invoked to explain zoned ultramafic complex as the surface expression of translithospheric mantle diapirs. In this model, melt present in spatially constrained channels induces bouncy driven upwelling of the melt channels. A critical, yet unproven assumption of the proposed model is that these bodies reach deep into the upper mantle and that the presence of melt in the mantle can indeed induce upward motion of the channels. Here we present field, petrological and textural evidence from the Beni Bousera ultramafic massif that imply differential movement of melt percolation zones (MPZ) with respect to the surrounding mantle. In Beni Bousera, known for its abundant and variable pyroxenites dykes, we identified tens to hundreds of meters wide melt percolation zones, characterized by replacive dunite, harzburgite, and “secondary” lherzolites, within a heterogeneous “primary” lherzolite. The pyroxenite dykes are not homogenously distributed throughout the massif. Few centimeter-thick pyroxene dykes are sporadically present throughout the massif, (garnet-) augite pyroxenite and Cr-diopside pyroxenite occur in increased frequency (up to ~ 40-80 vol% of single outcrops) in the restricted MPZ. There is a distinct difference in deformation fabric observed in the MPZ and surrounding lherzolite in the field. In the MPZ, a linear and planar fabric defined by the orientation of spinel and pyroxenes is developed within peridotites. Sharply defined pyroxenite dykes are generally parallel to the foliation and locally observed isoclinal recumbent folds and sheared folds of those dykes exhibit an axial planar foliation parallel to the foliation in the surrounding peridotites. The axes of these folds are generally parallel to the mineral lineation observed in the peridotites. In rare cases (garnet-) augite pyroxenite oblique to the foliation is observed. By contrast, Cr-diopside dykes and patches, which exhibit irregular and diffuse contacts with surrounding peridotites and crosscut the planar fabric, are generally significantly less deformed than (garnet-) augite pyroxenite from the same outcrop indicating that deformation was contemporaneous with the formation of the Cr-diopside patches. Lattice preferred orientation (LPO) of olivine crystals from a sample transect across one MPZ was analyzed and compared with LPO from the surrounding host lherzolite and harzburgite. The LPO patterns are generally weak and are slightly but systematically different for peridotites within the MPZ compared with those outside the zone; across the MPZ, orientation of the olivine [100] axis with respect to the mineral foliation changes asymmetrically. Based on the indications for high shear strain, we assume that the foliation coincides closely with the shear plane. In this case, the change in olivine [100] axis orientation towards the center of the zone can be interpreted as indicating an increase in strain towards the center of the zones and a change in shear sense across the zone. These observations suggest that focused melt flow can induce deformation in its host peridotite.

Jagoutz, O. E.; Stanley, J.; Gysi, A.; Hirth, G.

2009-12-01

194

View of west elevation; camera facing northeast. Mare Island ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of west elevation; camera facing northeast. - Mare Island Naval Shipyard, Equipment & Recruitment Storehouse, Waterfront Avenue, northwest corner of Waterfront Avenue & Fifth Street, Vallejo, Solano County, CA

195

1. Aerial view, looking northeast up Newark Bay, showing entire ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. Aerial view, looking northeast up Newark Bay, showing entire island Charles Wisniewski, photographer, January 1985 - Shooters Island, Ships Graveyard, Newark Bay, Staten Island (subdivision), Richmond County, NY

196

11. VIEW NORTHEAST, DETAIL OF BRIDGE BEARING AT SOUTHEAST CORNER, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. VIEW NORTHEAST, DETAIL OF BRIDGE BEARING AT SOUTHEAST CORNER, SHOWING WELDED REINFORCEMENT - Perkins Corner Bridge, Spanning Willimantic River at Flanders & Cider Mill Roads, Coventry, Tolland County, CT

197

4. Hospital Point, Saunders Monument, view to northeast Portsmouth ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Hospital Point, Saunders Monument, view to northeast - Portsmouth Naval Hospital, Bounded by Elizabeth River, Crawford Street, Portsmouth General Hospital, Parkview Avenue, & Scotts Creek, Portsmouth, Portsmouth, VA

198

1. OVERVIEW OF MAIN HOSPITAL, NORTHEAST CORNER. Presidio of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. OVERVIEW OF MAIN HOSPITAL, NORTHEAST CORNER. - Presidio of San Francisco, Letterman General Hospital, Building No. 27, Letterman Hospital Complex, Edie Road, San Francisco, San Francisco County, CA

199

5. Hospital Point, northeast bulkhead (typical), view to northwest ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Hospital Point, northeast bulkhead (typical), view to northwest - Portsmouth Naval Hospital, Bounded by Elizabeth River, Crawford Street, Portsmouth General Hospital, Parkview Avenue, & Scotts Creek, Portsmouth, Portsmouth, VA

200

Northeast and northwest elevations. View to south Flint Creek ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Northeast and northwest elevations. View to south - Flint Creek Hydroelectric Project, Powerhouse, Approximately 3 miles southeast of Porters Corner on Powerhouse Road, Philipsburg, Granite County, MT

201

OVERHILLS GOLF COURSE LOOKING NORTHEAST FROM SPECTATOR SHELTER BACK UP ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

OVERHILLS GOLF COURSE LOOKING NORTHEAST FROM SPECTATOR SHELTER BACK UP FAIRWAY #1 - Overhills, Fort Bragg Military Reservation, Approximately 15 miles NW of Fayetteville, Overhills, Harnett County, NC

202

Elevation of grove looking northeast toward Washington Monument 1910 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Elevation of grove looking northeast toward Washington Monument - 1910 Japanese Flowering Cherry Trees , East Potomac Golf Course East Potomac Park Haines Point vicinity, Washington, District of Columbia, DC

203

INTERIOR OF KITCHEN. view TO NORTHEAST Plattsburgh Air Force ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

INTERIOR OF KITCHEN. view TO NORTHEAST - Plattsburgh Air Force Base, Air Force Communications Systems (AFCS) Maintenance Facility, Off Alabama Avenue, adjacent to Flightline Apron, Plattsburgh, Clinton County, NY

204

Numerical model of continental collision: comparison between Variscan (Bohemian Massif) and modern (Himalayan) orogeny  

NASA Astrophysics Data System (ADS)

Internal structure and dynamics of modern orogens are still uncertain, because geophysical methods provide only indirect information and geological observation is limited due to preservation of a rigid crustal lid. In contrast to this, the internal structure of ancient orogens can be directly studied at the surface, as the crustal lid is eroded during the final stage of an orogeny. An example of a well preserved ancient orogen is the Bohemian Massif consolided during the Variscan orogeny. For this orogen, a scenario of tectonic evolution has been established involving crustal thickening and growth of a topographic plateau, vertical extrusion of lower crust (in the Moldanubian domain) and subsequent subhorizontal channel flow above an inclined margin of a continental promontory. The Variscan orogeny was in spatial and time extent similar to the Himalayan orogeny and detailed comparison between the two systems shows further analogies in metamorphism, geometry of collisional process, and felsic middle/lower crustal composition which has been proposed in some regions. We present results of 2D numerical modeling of continental collision, which we performed using the FE software Elmer (www.csc.fi/english/pages/elmer). For this purpose, we extended the software by procedures for compositional convection, visco-plastic deformation, erosion, sedimentation and flexural isostasy. The model well reproduces the main geological observables for the continental collision in the Bohemian Massif: Timing of the exhumation of the lower crust and related pressure-temperature paths, the subhorizontal flow, and topography evolution and sedimentation. The salient feature of the model is presence of the felsic heat-productive lower crust in the Moldanubian block. Not all sets of model parameters lead to efficient extrusion of the rocks to the surface. For the development of the subhorizontal flow, focusing effect of erosion is essential. Applied slope-dependent erosion focuses the flow to the steep front of the orogen while erosion at the orogenic plateau is small. We then compare Bouguer anomaly and surface heat flow in our model with those measured for active orogens. The gravity anomaly in the model is built up progressively during crustal thickening and vertical mass transfer stages and remains stable during the subhorizontal flow stage. The anomaly has a similar shape but somewhat smaller magnitude (about -350 mGal) than the one of the Himalayan orogen. The heat flow grows during the building of the plateau up to about 90 mW/m2, and evolves into a narrow positive anomaly above the front of the orogen during subhorizontal extrusion of rocks to the surface.

Maierová, P.; ?adek, O.; Schulmann, K.; Lexa, O.

2012-04-01

205

Experimental constraints on ultrapotassic magmatism from the Bohemian Massif (durbachite series, Czech Republic)  

NASA Astrophysics Data System (ADS)

The equilibrium phase relations of a mafic durbachite (53 wt.% SiO2) from the T?ebí? pluton, representative of the Variscan ultrapotassic magmatism of the Bohemian Massif (338-335 Ma), have been determined as a function of temperature (900-1,100°C), pressure (100-200 MPa), and H2O activity (1.1-6.1 wt.% H2O in the melt). Two oxygen fugacity ranges were investigated: close to the Ni-NiO (NNO) buffer and 2.6 log unit above NNO buffer (?NNO + 2.6). At 1,100°C, olivine is the liquidus phase and co-crystallized with phlogopite and augite at 1,000°C for the whole range of investigated pressure and water content in the melt. At 900°C, the mineral assemblage consists of augite and phlogopite, whereas olivine is not stable. The stability field of both alkali feldspar and plagioclase is restricted to low pressure (100 MPa) at nearly water-saturated conditions (<3-4 wt.% H2O) and T < 900°C. A comparison between experimental products and natural minerals indicates that mafic durbachites have a near-liquidus assemblage of olivine, augite, Ti-rich phlogopite, apatite and zircon, followed by alkali feldspar and plagioclase, similar to the mineral assemblage of minette magma. Natural amphibole, diopside and orthopyroxene were not reproduced experimentally and probably result from sub-solidus reactions, whereas biotite re-equilibrated at low temperature. The crystallization sequence olivine followed by phlogopite and augite reproduces the sequence inferred in many mica-lamprophyre rocks. The similar fractionation trends observed for durbachites and minettes indicate that mafic durbachites are probably the plutonic equivalents of minettes and that K- and Mg-rich magmas in the Bohemian Massif may have been generated from partial melting of a phlogopite-clinopyroxene-bearing metasomatized peridotite. Experimental melt compositions also suggest that felsic durbachites can be generated by simple fractionation of a more mafic parent and mixing with mantle-derived components at mid crustal pressures.

Parat, Fleurice; Holtz, François; René, Miloš; Almeev, Renat

2010-03-01

206

CRE dating on the scarps of large landslides affecting the Belledonne massif ( French Alps)  

NASA Astrophysics Data System (ADS)

The southwestern edge of the Belledonne Massif (French Alps) consists of micaschists unconformably covered with Mesozoic sediments and Quaternary deposits. The morphology corresponds to a glacial plateau (Mont Sec plateau) bordered by steep slopes (around 40°), where moraines and peat bog subsist. The massif is incised by the East-West trending Romanche valley that was shaped by several cycles of quaternary glaciations and deglaciations. Slopes are affected by several active or past large scale rock mass instabilities. Cosmic Ray Exposure (CRE) dating was applied on the head scarps of three large landslides, one of which being the active Séchilienne landslide whose headscarp was already dated by Leroux et al. [2009]. Dating results suggest a concomitant initiation of these instabilities at about 7 ± 2 10Be ka, thousands years after the total downwastage of the valley. A different kinematic behaviour was however observed on two contiguous landslides for which continuous exposure profiles were obtained. On the Séchilienne landslide, 23 samples were collected from internal and lateral scarps, as well as on polished bedrock surfaces, with the aim of dating the internal kinematics of the landslide. Preliminary dating results obtained on polished surfaces and near the top of the scarps show unexpected low 10Be concentrations, suggesting the existence of thin moraine or peat bog deposits masking the bedrock, which have been subsequently eroded. The minimum thickness of these deposits was estimated assuming a constant denudation rate over time. Exposure date profiles show that the studied lateral and internal scarps were initiated at the same period as the Sechilienne headscarp. An increase in the exposure rate was also observed between 2 and 1 ka, in agreement with that evidenced along the headscarp. Forty other samples have been collected in the landslide to corroborate these results. Reference Le Roux, O., S. Schwartz , J.-F. Gamond, D. Jongmans, D. Bourles, R. Braucher, W. Mahaney, J. Carcaillet, and L. Leanni (2009). CRE dating on the head scarp of a major landslide (Séchilienne, French Alps), age constraints on Holocene kinematics. Earth and Planetary Science Letters, Vol. 280, 236-245.

Lebrouc, V.; Baillet, L.; Schwartz, S.; Jongmans, D.; Gamond, J. F.; Bourles, D.; Le Roux, O.; Carcaillet, J.; Braucher, R.

2012-04-01

207

Ductile deformation of garnet in mylonitic gneisses from the Münchberg Massif (Germany)  

NASA Astrophysics Data System (ADS)

Mylonitic gneisses from the Münchberg Massif contain single grains (type I) and polycrystalline aggregates (type II) of garnet displaying a distinct elongation parallel to a macroscopic lineation which is interpreted as the result of ductile deformation. Lattice-preferred orientations of quartz (textures) symmetrical to the macroscopic foliation and lineation and the lack of rotational microfabrics indicate that the bulk deformation was pure shear at least during the latest strain increments. Garnet textures measured by EBSD together with microprobe analyses demonstrate that these two structural types of garnet can be related to two different processes of ductile deformation: (1) For the single grains stretching can be attributed to diffusion creep along grain boundary zones (Coble creep). The related mass transfer is indicated by the fact that primary growth zones are cut off at the long faces of the grains while the related strain shadow domains do not show comparable chemical zoning. Pressure solution and precipitation suitable to produce similar structures can be largely ruled out because retrogressive reactions pointing to the presence of free hydrous fluids are missing. (2) For the polycrystalline garnet aggregates consisting of cores grading into fine-grained mantles, dislocation creep and associated rotation recrystallization can be assumed. Continuous lattice rotation from the core to the outer polycrystalline rim allow a determination of the related dominant slip systems which are {100}<010> and equivalent systems according to the cubic lattice symmetry. The same holds for garnets which appear to be completely recrystallized. For this type of fine-grained aggregates an alternative nucleation model is discussed. Due to penetrative dislocation glide in connection with short range diffusion and the resulting lattice rotation, primary growth zones are strongly disturbed. Since for the considered rock unit of the Münchberg Massif peak metamorphic temperatures between 630 and 670 °C can be assumed, this study clearly demonstrates that the inferred processes of ductile garnet deformation can occur not only in HT regimes as often suggested in the literature even if embedded within a matrix of “low-strength” minerals like quartz, feldspars and micas.

Vollbrecht, Axel; Pawlowski, Jan; Leiss, Bernd; Heinrichs, Till; Seidel, Madlen; Kronz, Andreas

2006-12-01

208

Palaeomagnetic constraints on the evolution of the Atlantis Massif oceanic core complex (Mid-Atlantic Ridge, 30°N)  

NASA Astrophysics Data System (ADS)

Oceanic core complexes expose lower crustal and upper mantle rocks on the seafloor by tectonic unroofing in the footwalls of large-slip detachment faults. They represent a fundamental component of the seafloor spreading system at slow and ultraslow axes. One of the most extensively studied oceanic core complexes is Atlantis Massif, located at 30°N at the intersection of the Atlantis Transform Fault and the Mid Atlantic Ridge (MAR). The central dome of the massif exposes the corrugated detachment fault surface and was drilled during IODP Expedition 304/305 (Hole U1309D). This sampled a 1.4 km faulted and complexly layered footwall section dominated by gabbroic lithologies with minor ultramafic rocks. Palaeomagnetic analyses demonstrate that the gabbroic sequences at Atlantis Massif carry highly stable remanent magnetizations that provide valuable information on the evolution of the section. Thermal demagnetization experiments recover high unblocking temperature components of reversed polarity (R1) throughout the gabbroic sequences. Correlation of structures observed on oriented borehole (FMS) images and those recorded on unoriented core pieces allows reorientation of R1 remanences. The mean remanence direction in true geographic coordinates constrains the tectonic rotation experienced by the Atlantis Massif footwall, indicating a 46°±6° counterclockwise around a MAR-parallel horizontal axis trending 011°±6°. The detachment fault therefore initiated at a steep dip of >50° and then rotated flexurally to its present day low angle geometry (consistent with a 'rolling-hinge' model for detachment evolution). In a number of intervals, the gabbros exhibit a complex remanence structure with the presence of additional intermediate temperature normal (N1) and lower temperature reversed (R2) polarity components, suggesting an extended period of remanence acquisition during different polarity intervals. Sharp break-points between different polarity components suggest that they were acquired by a thermal mechanism. There appears to be no correlation between remanence structure and either the igneous stratigraphy or the distribution of alteration in the core. Instead, the remanence data are consistent with a model in which the lower crustal section acquired magnetizations of different polarity during a protracted cooling history spanning two geomagnetic reversals. The crystallization age of the section (1.2 Ma; derived from Pb/U zircon dating) suggests that the R1 component was acquired during geomagnetic polarity chron C1r.2r, N1 during chron C1r.1n (Jaramillo) and R2 during chron C1r.1r. By considering the maximum time intervals available for acquisition of the N1 and R2 components and correcting laboratory unblocking temperatures accordingly, the data provide additional constraints on the thermal evolution of the Atlantis Massif footwall.

Morris, A.; Pressling, N.; Gee, J. S.

2012-04-01

209

Carboniferous and Cretaceous mafic-ultramafic massifs in Inner Mongolia (China): A SHRIMP zircon and geochemical study of the previously presumed integral "Hegenshan ophiolite"  

NASA Astrophysics Data System (ADS)

We present SHRIMP zircon ages and whole-rock geochemical data to identify mafic-ultramafic massifs of early Carboniferous and early Cretaceous ages from northern Inner Mongolia, China. The early Carboniferous massifs (Chongenshan-Xiaobaliang-Wusnihei) comprise predominantly lherzolite and minor gabbroic rocks. Zircons from a microgabbro (?Nd (t) = 9.8) and a plagiogranite (?Nd (t) = 9) yielded weighted mean 206Pb/238U ages of 354 ± 7 Ma and 333 ± 4 Ma, that we interpret as reflecting the time of zircon (and magma) crystallization. A volcanic breccia resting unconformably on the ultramafic rocks (serpentinites) has an eruption age of 300 ± 2 Ma and provides a younger minimum time limit for the emplacement of the early Carboniferous mafic-ultramafic massifs. In contrast, the early Cretaceous mafic-ultramafic massifs (Hegenshan-Chaogenshan) consist predominantly of harzburgite. A pegmatoid gabbro and a rodingite (?Nd (t) = 10.6) from the Hegenshan massif have magmatic zircon ages of 139 ± 2 Ma and 132 ± 7 Ma respectively. The Chaogenshan massif is concentrically zoned with an ultramafic core (dominantly harzburgite-dunite + subordinate lherzolite) surrounded by gabbro (with minor hornblendite) and an outermost volcano-sedimentary sequence (metabasaltic flows + metapelites). We dated zircons from a leuocogabbro (125 ± 2 Ma; ?Nd (t) = 10.6), a coarse-grained gabbro (142 ± 4 Ma), and a metabasalt (134 ± 2 Ma). Zircon xenocrysts (ca. 152-492 Ma) are ubiquitous in these and other associated rocks (a coarse-grained gabbro and a diabase), as in the Hegenshan rocks (ca. 152-468 Ma). The youngest detrital zircon in outer zone garnet schist (i.e. metapelite) has an age of 132 ± 2 Ma. Accordingly, we conclude that the northern Inner Mongolia lherzolite-dominant and harzburgite-dominant massifs are temporally and genetically unrelated. Their emplacement is attributed to asthenospheric upwelling and consequent lithospheric extension during periods of orogenic quiescence in the southern Central Asian Orogenic Belt.

Jian, Ping; Kröner, Alfred; Windley, Brian F.; Shi, Yuruo; Zhang, Wei; Zhang, Liqao; Yang, Weiran

2012-06-01

210

40 CFR 81.162 - Northeast Plateau Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Northeast Plateau Intrastate Air Quality Control Region...Control Regions § 81.162 Northeast Plateau Intrastate Air Quality Control Region. The Northeast Plateau Intrastate Air Quality Control...

2012-07-01

211

Boiling fluids in a region of rapid uplift, Nanga Parbat Massif, Pakistan  

NASA Astrophysics Data System (ADS)

The Nanga Parbat massif of northern Pakistan is currently undergoing rapid uplift (approx. 5-10 mm/a), resulting in near-surface elevated temperatures. Numerous quartz veins cut geologically young structures (less than 2 Ma), attesting to widespread young fluid flow. Fluid inclusions in quartz veins are predominantly low density water vapor (down to 0.05 mg/cu m), with some low density carbon dioxide vapor, and the fluid is predominantly meteoric in origin. Fluid inclusions provide evidence for boiling near to the critical points for water and for 5 wt% NaCl solution (up to 410 C). Head-driven meteoric water was convecting in fracture permeability under hydrostatic pressures which followed the boiling point-depth curve and near-boiling springs emanate from the surface. Hydrostatic pressures persisted to depths of about 6 km below the topographic surface, or near to sea level, where the brittle-ductile transition is inferred to lie. Numerical modeling of conductive heat flow in an area of high relief during rapid uplift indicates that the shape of the near-surface conductive geotherm is significantly influenced by topographic relief. Reasonable approximations for topgraphy at Nanga Parbat produce a conductive geotherm which implies high, near-surface geothermal gradients (greater than 100 C/km, and the isotherms describe a giant pillar of heat. Above about 4 km, fluid temperature is greater than conductive rock temperature in permeable zones which carry convecting boiling meteoric fluid.

Craw, D.; Koons, P. O.; Winslow, D.; Chamberlain, C. P.; Zeitler, P.

1994-12-01

212

Raman imaging of fluid inclusions in garnet from UHPM rocks (Kokchetav massif, Northern Kazakhstan).  

PubMed

Confocal Raman imaging of fluid inclusions in garnet porphyroblasts from diamond-grade metamorphic calc-silicate rocks from the Kumdy-Kol microdiamond deposit (Kokchetav Massif, Northern Kazakhstan) reveals that these fluid inclusions consist of almost pure water with different step-daughter phases (e.g., calcite, mica and rare quartz). These fluid inclusions are characterized by negative crystal shape of the host-garnet and they exclusively occur within the core of garnet porphyroblasts. These observations are consistent with their primary origin, most likely at ultrahigh-pressure (UHP) metamorphic conditions. The euhedral newly formed garnet, different in color and composition, was found to be associated with these fluid inclusions. It is proposed that newly formed garnet and water fluid inclusions appear by reaction between the hydrous fluid and the garnet-host. These fluid inclusions provide an unequivocal record of almost pure H(2)O fluids, indicating water-saturated conditions within subducted continental crust during prograde stage and/or ultrahigh-P metamorphism. PMID:21377920

Korsakov, Andrey V; Dieing, Thomas; Golovin, Aleksandr V; Toporski, Jan

2011-03-05

213

ESR dating of a quartz single crystal from the Menderes Massif in Turkey  

PubMed

Electron spin resonance (ESR) has been employed to date the most recent geological metamorphism by use of a large quartz single crystal extracted from the metamorphic region of Menderes Massif (MM) in Western Turkey. The ESR spectra showed two paramagnetic centers: Al and Ti centers. The former was used for dating, since the latter was already saturated by natural radiation. The age, estimated to be 1.8+/-0.5 Ma, does not agree with the previous age evaluated by isotopic dating techniques suggesting that the thermal or geothermal stressing history of the metamorphic region must have changed the apparent ESR age. A detailed annealing experiment at various temperatures was performed to investigate the influence of thermal annealing in the past and the resulting life time was calculated to be 8.4 x 10(4) a for the Al center, the lifetime for Ti being shorter than that for Al. The lifetime of Al is thus shorter than its ESR measured age. The discrepancy can be explained in terms of the present-day annual dose or 238U, 232Th, and 40K, concentrations being much smaller than the previous annual doses under severe environmental conditions, such as erosive, natural chemical etching and weathering processes. PMID:10836455

Ulusoy

2000-05-01

214

Raman mapping of coesite inclusions in garnet from the Kokchetav Massif (Northern Kazakhstan).  

PubMed

Coesite inclusions occur in a wide range of lithologies and coesite is therefore a powerful ultrahigh-pressure (UHP) indicator. The transformation of coesite to quartz is evidenced by three optically well identifiable characteristics (e.g. palisade textures, radial crack patterns, polycrystalline quartz pseudomorphs). Under overpressure monomineralic coesite (on an optical basis), lacking the above transformation characteristics may survive. Raman micro-spectroscopy was applied on monomineralic coesite inclusions in garnet porphyroblasts from diamond-bearing garnet-clinozoisite-biotite gneisses of the Barchi-Kol area (Kokchetav Massif, Northern Kazakhstan). These coesite inclusions are euhedral and display a characteristic anisotropic hallo. However, Raman maps and separate spectra of these inclusions display shifted bands for coesite and quartz. Microscopically undetectable, quartz shows on the Raman map as a thin shell around coesite inclusion. Shift of the main coesite band allows to estimate their overpressure: coesite inclusions record 0-2.4 GPa in garnet and zircon. The quartz shell remains under lower pressure 0-1.6 GPa. The possible application of coesite and quartz Raman geobarometers for UHP metamorphic rocks is discussed. PMID:17553735

Korsakov, Andrey V; Hutsebaut, Didier; Theunissen, Karel; Vandenabeele, Peter; Stepanov, Alexander S

2007-04-19

215

Analysis of the upper massif of the craniofacial with the radial method - practical use  

PubMed Central

Introduction The analysis of the upper massif of the craniofacial (UMC) is widely used in many fields of science. The aim of the study was to create a high resolution computer system based on a digital information record and on vector graphics, that could enable dimension measuring and evaluation of craniofacial shape using the radial method. Material and methods The study was carried out on 184 skulls, in a good state of preservation, from the early middle ages. The examined skulls were fixed into Molisson's craniostat in the author's own modification. They were directed in space towards the Frankfurt plane and photographed in frontal norm with a digital camera. The parameters describing the plane and dimensional structure of the UMC and orbits were obtained thanks to the computer analysis of the function recordings picturing the craniofacial structures and using software combining raster graphics with vector graphics. Results It was compared mean values of both orbits separately for male and female groups. In female skulls the comparison of the left and right side did not show statistically significant differences. In male group, higher values were observed for the right side. Only the circularity index presented higher values for the left side. Conclusions Computer graphics with the software used for analysing digital pictures of UMC and orbits increase the precision of measurements as well as the calculation possibilities. Recognition of the face in the post mortem examination is crucial for those working on identification in anthropology and criminology laboratories.

Lepich, Tomasz; Dabek, Jozefa; Stompel, Daniel; Gielecki, Jerzy S.

2011-01-01

216

Regional Ozone Modeling for Northeast Transport (ROMNET). Appendices.  

National Technical Information Service (NTIS)

The Regional Ozone Modeling for Northeast Transport (ROMNET) Project was initiated by the U.S. EPA and State and local air pollution agencies in the Northeast to address the problem of regional transport in developing effective and equitable control progr...

N. C. Possiel L. B. Milich B. R. Goodrich E. L. Meyer K. L. Schere

1991-01-01

217

27. LOBBY, LOOKING NORTHEAST FROM SECOND FLOOR. THE STRUCTURE IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

27. LOBBY, LOOKING NORTHEAST FROM SECOND FLOOR. THE STRUCTURE IN UPPER LEFT HAND SIDE OF PHOTOGRAPH, A MUSICIANS' PLATFORM CALLED 'THE CROW'S NEST' WAS BUILT IN THE GABLE. - Old Faithful Inn, 900' northeast of Snowlodge & 1050' west of Old Faithful Lodge, Lake, Teton County, WY

218

42. INTERIOR VIEW LOOKING NORTHEAST AT THE STAMP BATTERIES. ONE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

42. INTERIOR VIEW LOOKING NORTHEAST AT THE STAMP BATTERIES. ONE OF THE DRIVE WHEELS IS ON THE FOREGROUND RIGHT WITH AN EXTANT DRIVE BELT. THE CAM SHAFT EXTENDS TO THE BACKGROUND CENTER. - Standard Gold Mill, East of Bodie Creek, Northeast of Bodie, Bodie, Mono County, CA

219

Power Structure and Its Stability in North-East Asia  

Microsoft Academic Search

Its my pleasure to share viewpoints on the peace of North-East Asia with you here. But first, I would like to say thanks to the organizer for arranging the talk for me. The peace of northeast Asia, in my opinion, is decided and will be decided by the stability of Sino-America relationship, this is the center of this issue, while

Yuzhu Wang

2007-01-01

220

Technical potential for proliferation in Northeast Asian states.  

National Technical Information Service (NTIS)

This paper is intended to review the technical capabilities of the states in Northeast Asia--principally Japan, South Korea, and North Korea--to develop nuclear weapons. All three nonnuclear weapons states in Northeast Asia have the technical capability t...

N. Joeck R. Kramer

1994-01-01

221

72. NORTHEAST SIDE OF NITROGEN EXCHANGERS IN FOREGROUND; FUEL APRON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

72. NORTHEAST SIDE OF NITROGEN EXCHANGERS IN FOREGROUND; FUEL APRON IN BACKGROUND. NORTHEAST CORNER OF WEST CAMERA TOWER ALSO IN BACKGROUND. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 East, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

222

1. VIEW NORTHWEST, NORTHEAST SIDE AND SOUTHEAST FRONT OF TOWER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW NORTHWEST, NORTHEAST SIDE AND SOUTHEAST FRONT OF TOWER AND ORIGINAL LIGHTHOUSE - Mispillion Lighthouse, Beacon Tower, South bank of Mispillion River at it confluence with Delaware River at northeast end of County Road 203, 7 miles east of Milford, Milford, Sussex County, DE

223

16. View of northeast corner of East Ward Street and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. View of northeast corner of East Ward Street and North McDonald Avenue, facing northeast. - Gaskin Avenue Neighborhood, Bounded by Dart Street to east, CSX Railroad to south, Pearl & Madison Avenues to west, & Wilson & Gordon Streets to north, Douglas, Coffee County, GA

224

17. Interior detail, pilaster on transverse wall at the northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. Interior detail, pilaster on transverse wall at the northeast end of the Machine Shop, Roundhouse Machine Shop Extension, Southern Pacific Railroad Carlin Shops, view to northeast (90mm lens). Note the offset top of the pilaster, a feature common to all interior transverse wall pilasters. - Southern Pacific Railroad, Carlin Shops, Roundhouse Machine Shop Extension, Foot of Sixth Street, Carlin, Elko County, NV

225

Northeast Heating Fuel Market, The Assessment and Options  

EIA Publications

In response to the President's request, this study examineshow the distillate fuel oil market (and related energy markets) in the Northeast behaved in the winter of 1999-2000, explains the role played by residential,commercial, industrial, and electricity generation sectorconsumers in distillate fuel oil markets and describes how that role is influenced by the structure of the energy markets in the Northeast

Joan Heinkel

2000-05-01

226

Horticultural management of solar greenhouses in the Northeast  

SciTech Connect

A manual on horticultural management of solar greenhouses in the Northeast is presented. The information it contains represents a combination of a number of people's experiences who have been operating solar greenhouses in the Northeast for a year or more. The focus of this manual is on how to produce food in a solar greenhouse using biological and ecological management methods.

Klein, M.

1980-01-01

227

Workshop on Power GRID Interconnection in NorthEast Asia  

Microsoft Academic Search

OAK B135 The first workshop of the Northeast Asia Power Grid Interconnection project (Grid project) was held in Beijing from May 14 through 16, 2001 in collaboration with the State Power International Service and the Electric Power Research Institute of China. Power system experts, electrical engineers, economists, and energy policy researchers from all countries in the Northeast Asian region along

see website

2001-01-01

228

NORTHEAST LOON STUDY WORKING GROUP PARTNERSHIP TO ASSESS ENVIRONMENTAL RISK  

EPA Science Inventory

The Northeast Loon Study Working Group (NELSWG) was formed in 1994 to proactively identify threats to one of the Northeast's most popular waterbirds, the common loon, Gavia immer. Seventeen institutions have come together to identify strategy, coordinate the work load, and share ...

229

Northeast Oregon Waste Wood Utilization Project, Final Report.  

National Technical Information Service (NTIS)

This is the final report of the Northeast Oregon Waste Wood Utilization Project -- a regional effort in northeast Oregon to combat common problems of high unemployment in the timber industry of the region and the marketing of destroyed timber resulting fr...

1982-01-01

230

Cell block three and northeast guard tower (center), looking from ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Cell block three and northeast guard tower (center), looking from the central guard tower, facing northeast (note view also includes the baseball field (left), and cell blocks fourteen and eleven (right)) - Eastern State Penitentiary, 2125 Fairmount Avenue, Philadelphia, Philadelphia County, PA

231

2. SOUTHEAST SIDE AND NORTHEAST REAR. SHOP BUILDING IN DISTANCE. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. SOUTHEAST SIDE AND NORTHEAST REAR. SHOP BUILDING IN DISTANCE. NOTE CONCRETE PROTECTION SLAB FOR UNDERGROUND CONTROL ROOM AND ESCAPE HATCH ON GROUND AT RIGHT MIDDLE DISTANCE. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Firing Control Building, Test Area 1-100, northeast end of Test Area 1-100 Road, Boron, Kern County, CA

232

3. NORTHEAST REAR, SHOWING CONCRETE ENCASEMENT FOR STAIRWAY LEADING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. NORTHEAST REAR, SHOWING CONCRETE ENCASEMENT FOR STAIRWAY LEADING FROM INSTRUMENT ROOM TO UNDERGROUND FIRING CONTROL ROOM. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Firing Control Building, Test Area 1-100, northeast end of Test Area 1-100 Road, Boron, Kern County, CA

233

2. VIEW OF NORTHEAST (GABLE END) AND SOUTHEAST SIDES FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW OF NORTHEAST (GABLE END) AND SOUTHEAST SIDES FROM THE NORTHEAST. (BUILDING 111 VISIBLE ON LEFT; BUILDING 114 AT RIGHT.) INTERIOR OF BUILDING 113 TO THE SOUTHEAST.) - Fort McPherson, World War II Station Hospital, G. U. Treatment Unit Lavatory, Thorne & Hood Avenues, Atlanta, Fulton County, GA

234

Drillstring failure analysis and its prevention in northeast Sichuan, China  

Microsoft Academic Search

In this paper, the causes for drillstring failure encountered during drilling practice in northeast Sichuan region (China) are systematically investigated based on more than 130 failure cases. The fault tree of drillstring failure in northeast Sichuan (China) is then constructed with considering the drillstring failure as the top event of the fault tree. The minimal cut sets and the minimal

Rui-he Wang; Yan-bin Zang; Rui Zhang; Yu-huan Bu; Hua-zhou Li

2011-01-01

235

Environmental benefits of electricity grid interconnections in Northeast Asia  

Microsoft Academic Search

From an environmental perspective, electricity grid interconnections in Northeast Asia make sense. Cities in Northeast China, Mongolia, the Democratic People’s Republic of Korea (DPRK), and the Republic of Korea (ROK) suffer from poor air quality due to the extensive use of coal-fired power generation. Rural communities suffer from a deficit of electricity, forcing reliance on coal and biofuels for cooking

D. G. Streets

2003-01-01

236

Hunting for Livelihood in Northeast Gabon: Patterns, Evolution, and Sustainability  

Microsoft Academic Search

We suggest an ethno-biological approach to analyze the cultural and social drivers of hunting activities and assess sustainability in villages near Makokou, northeast Gabon, based on interviews with hunters, participatory mapping of hunting territories, and daily records of offtakes for 1 yr. Hunting in villages of northeast Gabon is practiced for both local consumption and cash income to cover basic

Nathalie van Vliet; Robert Nasi

2008-01-01

237

Changing Waves and Storms in the Northeast Atlantic?  

Microsoft Academic Search

The European project WASA (Waves and Storms in the North Atlantic) has been set up to verify or disprove hypotheses of a worsening storm and wave climate in the northeast Atlantic and its adjacent seas in the present century. Its main conclusion is that the storm and wave climate in most of the northeast Atlantic and in the North Sea

1998-01-01

238

Northeast Oregon Hatchery Project, Final Siting Report.  

SciTech Connect

This report presents the results of site analysis for the Bonneville Power Administration Northeast Oregon Hatchery Project. The purpose of this project is to provide engineering services for the siting and conceptual design of hatchery facilities for the Bonneville Power Administration. The hatchery project consists of artificial production facilities for salmon and steelhead to enhance production in three adjacent tributaries to the Columbia River in northeast Oregon: the Grande Ronde, Walla Walla, and Imnaha River drainage basins. Facilities identified in the master plan include adult capture and holding facilities; spawning incubation, and early rearing facilities; full-term rearing facilities; and direct release or acclimation facilities. The evaluation includes consideration of a main production facility for one or more of the basins or several smaller satellite production facilities to be located within major subbasins. The historic and current distribution of spring and fall chinook salmon and steelhead was summarized for the Columbia River tributaries. Current and future production and release objectives were reviewed. Among the three tributaries, forty seven sites were evaluated and compared to facility requirements for water and space. Site screening was conducted to identify the sites with the most potential for facility development. Alternative sites were selected for conceptual design of each facility type. A proposed program for adult holding facilities, final rearing/acclimation, and direct release facilities was developed.

Watson, Montgomery

1995-03-01

239

Evidence for high silicic melt circulation and metasomatic events in the mantle beneath alkaline provinces: the Na–Fe-augitic green-core pyroxenes in the Tertiary alkali basalts of the Cantal massif (French Massif Central)  

Microsoft Academic Search

Summary  ?Na–Fe augitic green-core pyroxenes (hereafter called GCPX) are common in the silica-undersaturated basaltic rocks of many\\u000a magmatic alkaline provinces. In the Cantal massif, green-core pyroxenes occur in nearly all the Supracantalian basalts (9.5\\u000a to 2?Ma), in contrast to the Infracantalian basalts (13 to 9.5?Ma) where they are rarely observed. An electron microprobe\\u000a study demonstrates that the GCPX crystallized from evolved

S. Pilet; J. Hernandez; B. Villemant

2002-01-01

240

“Equator Crossing” of Shatsky Rise?: New insights on Shatsky Rise tectonic motion from the downhole magnetic architecture of the uppermost lava sequences at Tamu Massif  

NASA Astrophysics Data System (ADS)

Shatsky Rise is a Large Igneous Province (LIP) currently located in the northwestern Pacific. New downhole magnetic logging data from Integrated Ocean Drilling Program (IODP) Hole U1347A at Tamu Massif of Shatsky Rise captured the magnetic architecture in the uppermost lava sequence, providing a rare opportunity to investigate a time series of the intra-plate volcanism in conjunction with the Pacific plate construction history centered at the triple junction. Logging data results indicate that Tamu Massif was formed during normal polarity periods south of the paleoequator and crossed the equator at some point in the M19-M17 period. Combining these new observations with previous interpretations of the massif's tectonic history, a time series of the latitudinal tectonic motion of a LIP and the underlying Pacific plate during the plateau formation is postulated.

Tominaga, Masako; Evans, Helen F.; Iturrino, Gerardo

2012-11-01

241

Thermochronological Constraints on the Exhumation of the Lys Caillaouas Massif, West-Central Pyrenees  

NASA Astrophysics Data System (ADS)

The Pyrenees Mountains of Spain and France are a collisional orogen cored by a south-vergent antiformal stack of Paleozoic basement thrust sheets (the Axial Zone). Thrusting accommodated shortening due to convergence between Iberia and Europe during the Alpine orogeny. In the central Pyrenees, the Axial Zone is divided structurally into the Nogueres, Orri, and Rialp thrust sheets. The Orri thrust sheet is in the footwall of the Gavarnie thrust, a folded south-vergent thrust fault that separates the Orri thrust sheet from the hanging-wall Nogueres thrust sheet. In the central Pyrenees, integrated 40Ar/39Ar, apatite fission track, and apatite (U-Th)/He thermochronologic studies of the Maladeta pluton, lying within the Orri thrust sheet, constrains Late Cretaceous onset of heating due to thrust burial in the footwall of the Gavarnie thrust, followed by Cenozoic cooling due to erosional exhumation. To examine along-strike variations in the tectonic evolution of the Pyrenean orogen, we apply the same approach to the Lys Caillaouas massif (LCM) in the west-central Pyrenees. This massif occupies a similar structural position as the Maladeta but lies ~30 km to the WNW. The LCM is a ~60 km2 Hercynian igneous complex intruded into the Early Paleozoic metasediments of the Orri thrust sheet, five kilometers south of the present exposure of the Gavarnie thrust and bounded to the south by the south-vergent Alpine-age Estos Thrust, a fault within the Orri thrust sheet. In thin section, muscovite from the highest elevation sample (3221 m) from the LCM is often rimmed with neo-crystallized mica, yet >95% of the 39Ar yields an 40Ar/39Ar plateau age of 299.7 ± 1.4 Ma, similar to the crystallization age. Mica from the lowest elevation sample (2060 m) yields an apparent age gradient, with a minimum age of 125 Ma that increases steadily and reaches a maximum apparent age of 295 Ma. This sample has experienced significant chloritization, and the age spectra is interpreted to reflect the outgassing of a mixed mica population. Feldspar from both of these LCM samples yielded complex 40Ar/39Ar spectra, with minimum ages of ~40 Ma, and maximum ages of ~160 Ma. In contrast to the thermochronologic data from the Maladeta pluton, these feldspars are not suitable for multi-diffusion domain modeling because it is likely that loss of Ar is not due solely to thermally activated volume diffusion, but instead likely reflects outgassing from altered feldspar, including sericite. Lower temperature thermochronology from the age-elevation profile in the LCM records Cenozoic cooling, although interpretation is complicated by displacement on faults within the LCM. Both single- and multi-grain aliquots were analyzed to assess reproducibility in (U-Th)/He ages. 40Ar/39Ar and other low-temperature thermochronology, combined with regional structural studies, constrains possible thermal histories and permit an analysis of apatite (U-Th)/He age reproducibility and interpretation.

Metcalf, J. R.; Fitzgerald, P. G.; Baldwin, S.; Muñoz, J.; Perry, S. E.; Feinberg, E. B.

2009-12-01

242

Geochemistry of the nain massif anorthosite, labrador: Magma diversity in five intrusions  

NASA Astrophysics Data System (ADS)

The petrography and major- and trace-element concentrations of the anorthositic Bird Lake Massif (BLM), Susie Brook Slab (SBS), Lister Massif (LM), Port Man vers Run (PMR), and Kikkertavak area (KIK) in the Nain Plutonic Suite (NPS), Labrador, delineate the mineralogical and composition ranges of these large intrusions. From these, a variety of magmas and staging histories can be inferred. The BLM and SBS are mainly noritic anorthosites of the western region exposed along Tikkoatokhakh Bay (TIK). Tilting and stretching deformation distinguish SBS from BLM, but the two units show no mineralogical or chemical differences. The KIK and PMR intrusions are mainly troctolitic to noritic anorthosites of the eastern region, and they contain more mafic components than the TIK bodies. Chemically, all the anorthositic rocks are high in Ba, Sr, and the ratio K/Rb, and low in Zr, Rb, and Rb/Sr. The three plutonic bodies, BLM, SBS, and LM, along TIK are similar and can be clearly distinguished from KIK and PMR intrusions by element concentrations and ratios. Diagrams of element pairs show that each intrusion or group has its own evolutionary trend and variable style, indicating that they represent independent magma batches rather than fractionally related volumes of the same magma. REE patterns show light REE enrichment and heavy REE depletion, and strong positive Eu anomalies, correlated with cumulus plagioclase. In chemical comparison with adjacent plutons, one PMR-chilled leucotroctolite, after subtraction of 18% cumulus plagioclase, is similar to the Kiglapait magma (KI); one melatroctolite in KIK is close to the comb-layered melatroctolite of the Snowflake zone in the Hettasch Intrusion (HI); and the average leucotroctolite and leuconorite in KIK are similar to the leucotroctolite unit and the upper leuconorite, respectively, at Paul Island (PI). Therefore, the magmas from PMR and KIK are similar to those of wellknown troctolitic bodies and their feldspar-rich cumulates. KIK differs from PMR in having somewhat higher An and Xmg values. All these lines of evidence show that at least three types of magma existed in the study area: sodic noritic magma accumulating plagioclase in TIK, troctolitic magma in KIK, and a magma similar to but more evolved than KIK in PMR. The methods used also illustrate the feasibility of characterizing magma compositions from diverse types of cumulates. Regional differences in modal and chemical composition occur in the NPS. Noritic compositions with pale plagioclase are located in the western and southern regions, and troctolitic compositions with darker plagioclase are located in the eastern region. A reasonably accurate boundary can now be drawn between the two regions, which differ in the nature of their transport from the mantle. In comparison with a primitive mantle composition, high Ba, Pb, K, Sr, Ti, and low Rb, Nb, Zr in the Nain anorthositic rocks are distinctive. These anomalies and the isotopic results of other investigators are consistent with mantle source enrichment followed by variable contamination during magma ponding at the base of the depleted crust.

Xue, Suizhou; Morse, S. A.

1993-08-01

243

Petrological Characterization of the Triassic Paleosurface in the Northern Bohemian Massif  

NASA Astrophysics Data System (ADS)

‘Albitization' is a widespread alteration process affecting sedimentary, igneous and metamorphic rocks. Albitized facies usually show a pinkish to red colour, depending on the degree of alteration. The main mineralogical process of this phenomenon is the pseudomorphic replacement of the primary Ca-Na plagioclases by secondary albite (Na). During this replacement biotite is often transformed to chlorite and inclusions of hematite, apatite, titanite, and calcite develop. So far, albitization has been systematically regarded as caused by magmatic derived hydrothermal brines, alkaline metasomatism reactions (Cathelineau, 1986; Petersson and Eliasson, 1997), or as a low grade metamorphic facies (Boles and Coombs, 1977). Recent studies in the Morvan Massif granites (Ricordel et al., 2007; Parcerisa et al., 2009) showed that the albitization there is related to the Triassic paleosurface. The decrease of this alteration with depth and its paleomagnetic age support the link of the albitization to the Triassic paleosurface. Furthermore, the petrographic data suggest the import of sodium by weathering solutions. The enrichement in Na+ of the fluids that triggered this alteration is probably linked to the Triassic salt deposits. Albitised pinkish facies have been recognized in the northern part of the Bohemian Massif (Polish Sudetes). Typical igneous and metamorphic rocks of the Klodzko area (southern Poland) are granites, granodiorites, schists, amphibolite, and gneisses, mostly of Paleozoic age. Three sites in the Klodzko area were sampled in detail from N to S: (1) Laski quarry, (2) Laski village, and (3) Chwalislaw. Here, the occurrence of the albitization is well developed and specific in its mineralogical paragenesis. Throughout the sample sites different albitization stages can be observed. The most albitized and therefore reddish facies can be found at the Laski village granite that consists of primary quartz and K-feldspar, biotite, and development of secondary albite, chlorite and hematite forming tiny granules. The albitization of the Laski quarry granite (and granodiorite) developed along fractures. The fractures show alteration gradients with reddish albitized facies at the walls and less albitized and rather pinkish facies away from the fracture zones. The mineral assemblage is similar to the previous section, nevertheless hematite is pigmentary here and calcite occurs. The most southern site of Chwalislaw shows only weak albitization forming pinkish spotted facies with minor hematite and maghemite concentrations. Recent paleomagnetic datations of these Polish albitized sections show a Triassic remagnetization carried by hematite and maghemite (Franke et al., 2009, 2010), related to the Triassic paleosurface. Moreover, based on the albitization degree, the massively hematised/albitized Laski village section seems to be closer to the ancient surface, whereas the fracture controlled albitization of the Laski quarry relates to deeper parts of the paleoprofile and the pinkish spotted facies of the Chwalislaw section are tied to the base of the paleosurface alteration. The albitized outcrops spread along a topographic surface that rises up southward. In detail, the arrangement of the various facies (massive, fracture controlled and spotted) allows to recognize zones where post-Triassic erosion has been more or less important and/or discontinuities due to fault movements. Mapping the albitized facies will allow to reconstruct the Triassic paleosurface and to date some strain events relatively to this surface. Recognizing the Triassic paleosurface is important with respect to the post-paleozoic geodynamic evolution of this crystalline basement. As the paleosurface is widely preserved in the Sudetes, the post-Triassic basement erosion has been weaker than the depth of the albitization profile (~200 m depth). References: Boles J.R., Coombs D.S., 1977. Zeolite facies alteration of sandstones in the southland syncline, New Zealand. American Journal of Science., 277, 982-1012. Cathelineau M., 1986. The hydrothermal alkali metaso

Yao, Kouakou; Thiry, Medard; Szuszkiewicz, Adam; Turniak, Krzysztof

2010-05-01

244

Ferric iron in orogenic lherzolite massifs and controls of oxygen fugacity in the upper mantle  

NASA Astrophysics Data System (ADS)

The bulk Fe2O3 contents and inter-mineral distributions of Fe3+ were investigated in a suite of samples from several orogenic lherzolite massifs, including Beni Bousera (Morocco), Ronda (Spain) and Lherz (France). Ferric iron contents were determined for each phase by Mössbauer spectroscopy and these results were combined with microprobe data and modal abundances to determine the bulk Fe2O3 contents. The notion that Fe3+ is moderately incompatible during partial melting in the mantle is supported by the observed decrease in bulk Fe2O3 content with increasing MgO, as well as by the generally lower Fe3+ content of clinopyroxene in samples with low modal abundances of this phase. The partitioning of Fe3+ between orthopyroxene and clinopyroxene is consistent with literature data for spinel peridotite xenoliths. The partitioning of Fe3+ between clinopyroxene and spinel is composition dependent, changing with the Cr/Al of spinel. Thus partitioning is expected to be different in the spinel peridotite and plagioclase peridotite facies of the upper mantle. The ƒO2 of orogenic massifs varies over several log units relative to the FMQ buffer. The values recorded by spinel-based and clinopyroxene-based oxygen barometry are generally comparable, indicating redox equilibrium between these two phases even at the relatively low temperature conditions existing in parts of the lithospheric mantle. Calculated bulk Fe2O3 contents range from 0.03 to 0.27 wt.%. The combination of modal abundance and major element composition means that orthopyroxene is a major contributor to the bulk Fe2O3 budget of peridotites, although clinopyroxene and spinel are much richer in Fe3+ on a per formula unit basis. Residual Cr-rich spinel is the dominant source of Fe3+ in plagioclase peridotites. In terms of the geochemical behaviour of Fe3+, it can be concluded that orogenic peridotites exhibit essentially the same behaviour as spinel peridotite xenoliths. In terms of the controlling factors of ƒO2 in the upper mantle, our data set records a certain degree of decoupling of ƒO2 from whole rock Fe2O3 content, even if a correlation between these two parameters is generally apparent. This decoupling is because, whereas both whole rock Fe2O3 content and ƒO2 are influenced by partial melting and melt extraction, additional processes such as metasomatism and phase changes can effectively reset ƒO2 without always causing a concomitant change in bulk Fe2O3 content. Modelling the oxidation of spinel reveals that the ƒO2 can be readily reset under initially reducing conditions, but the incorporation of progressively more and more Fe3+ in spinel is required to further raise ƒO2. A quasi-limit of ?logƒO2 = FMQ + 1 is expected. These results are consistent with the general redox behaviour observed for spinel peridotites. Our data imply that Fe3+ Fe2+ equilibria have an important, if not dominant influence on ƒO2 in the spinel peridotite facies of the upper mantle.

Woodland, A. B.; Kornprobst, J.; Tabit, A.

2006-06-01

245

Dirty or Tidy ? Contrasting peraluminous granites in a collapsing Orogen: Examples from the French Massif Central  

NASA Astrophysics Data System (ADS)

Post collisional collapse commonly enhances crustal melting. Such melting typically produces peraluminous granitic magmas. In the French Massif Central, a mid-crustal segment of the western Variscan belt, two large granitic bodies were produced during the collapse of the Variscan Belt. The St Sylvestre Leucogranitic Complex (SSyL) in the western part of the Massif Central and the Velay Migmatitic Complex (VMC) in the Eastern part. Although these two complexes are formed in similar geodynamic context they present meaningful petrological and geochemical differences. The VMC (~305 Ma) is clearly intrusive in migmatitic terranes. The migmatitic host recorded two successive melting events M3 (720 °C and 5kb) dated between 335 and 315 Ma and M4 (850°C and 4 kb) dated at 305 Ma. The compositions of the VMC are strictly H2O-undersaturated and ranges from leucogranitic to granodioritic. Three main successive granite types have been distinguished (1) A heterogeneous banded biotite granite, (2) A main biotite-cordierite granite, where cordierite can be prismatic, as cockade or pseudomorphic (3) a late magmatic with large K-feldspar phenocryst and prismatic cordierite. The compositions of the VMC granites are quite similar to typical Australian S-type granites in the sense that they also show a positive correlation between ferromagnesian abundance and aluminosity. The SSyL (~320 Ma) is intrusive in upper greenschist facies to upper amphibolite migmatitic metasediment and orthogneiss (~3kb). The compositional variety observed in the SSyL suggests a continuous trend from a moderately mafic, peraluminous magma (cd- and sill- granite) to a H2O saturated granite ("two-mica" granite) facies and finally to an extremely felsic, H2O-saturated magma. Three granitic units have been recognized in the SSyL: (1) the western "Brame Unit" composed of the less evolved cd- and sill- granite facies (2) the central "St Sylvestre Unit", composed mainly by U-rich two-mica granite, intruded by two synchronously emplaced fine grained granites to its western margin: "Fanay" (biotite dominant) and "Sagne" (Li-muscovite only) (3) the eastern "St Goussaud Unit" mostly composed of a muscovite-dominant leucogranite surrounded by Sn-W mineralization. The compositions in the SSyL have a weak ferromagnesian character, negatively correlated with aluminosity and are quite similar in composition to High Himalayan syn-collisionnal peraluminous granite (e.g. Manaslu) Compositional trend of the VMC granite can be easily mimicked by the addition of peritectic material (i.e. produced during incongruent biotite melting) to experimental melts produced through the melting of metasediments (Dirty). Compositions of the SSyL are similar to experimental melt only (Tidy). Such differences in composition could be the results of different processes: 1) Different melting reactions as a consequence of different conditions of melting (e.g. different source composition, temperature). 2) The peritectic phases remained "trapped" in the source during melt extraction due to the structuration of the source or a lower melt viscosity (e.g. higher F, Li, H2O contents). Interestingly, while within dirty granites, peritectic phase entrainment controls compositional variability, Tidy granites display original melt compositional variability as well as the potential effects of late magmatic processes.

Villaros, Arnaud; Pichavant, Michel; Moyen, Jean-François; Cuney, Michel; Deveaud, Sarah; Gloaguen, Eric; Melleton, Jérémie

2013-04-01

246

Geochemical Evidence for 1.9-1.8 Ga Continental Arc Magmatism in the Arequipa Massif, Southwestern Peru  

NASA Astrophysics Data System (ADS)

The anomalous Arequipa Massif, along the coast of southwestern Peru, is part of an exotic terrane (The Arequipa- Antofalla Basement) that was likely emplaced along the margin of Amazonia at ca. 1 Ga. As such, it may be a tectonic tracer left behind by the craton that collided with Amazonia during the ca. 1 Ga Sunsas Orogeny. Correlation of the massif with its "parent craton" could constrain the position of Amazonia within the Mesoproterozoic supercontinent Rodinia. Better characterization of the "pre-1 Ga" tectonic evolution of the Arequipa Massif is necessary to evaluate potential parent cratons. Previous geochronologic work has constrained the timing of Paleoproterozoic events. Bimodal magmatism occurred between 2.02-1.82 Ga. This granite and gabbro was metamorphosed between 1.82 and 1.79 Ga. The resulting gneisses were intruded by granite at ca. 1.79 Ga. The entire sequence was metamorphosed ca. 1 Ga, generating a planar fabric in the younger granite. Based on these ages, there are numerous potential parent cratons, including Amazonia, Sao Francisco/Congo Craton, Kalahari, Laurentia, and Baltica (although previous Pb isotopic work refuted potential correlation with Laurentia). New elemental analyses from the same samples now provide better characterization of the tectonic environment in which these rocks formed. Samples include three granitic gneisses, two metagabbroic amphibolites, and three foliated megacrystic granites. The six granitic rocks have calc-alkaline compositions and the two mafic rocks are alkaline-rich. Among the granitic samples, comparison of Ta/Yb vs Th/Yb is consistent with formation in an "active continental margin" and comparison of Th-Hf/3-Ta (for all samples), Rb vs. Y+Nb, Ta vs. Nb suggest formation by volcanic arc magmatism. Although the rocks have been metamorphosed, multiple geochemical indicators are consistent with formation during continental arc magmatism.

Loewy, S. L.; Bahlburg, H.

2007-12-01

247

New insights into serpentinization at Atlantis Massif, 30° N Mid-Atlantic Ridge, using wide-angle seismic method  

NASA Astrophysics Data System (ADS)

The Atlantis Massif is an ultramafic core complex that was formed in the last 1.5-2.0 Myr at the intersection of the Atlantis Fracture Zone and the Mid-Atlantic Ridge near 30° N by tectonic extension along a long-lived oceanic detachment fault. The exhumation of deep crustal and upper mantle rocks in the footwall of the fault provides an excellent tectonic window into the oceanic lithosphere. The Atlantis Massif will be the subject of a deep-drilling investigation for upcoming IODP Legs 304 and 305 (November 2004 - February 2005). Near-offset seismic reflection data (offset up to 3 km) across the core complex imaged a reflection at 0.2-0.25 s below the seafloor, which has been interpreted as an older detachment fault [Canales et al., Earth Planet. Sci. Lett., 222, 543-560, 2004]. The application of a non-conventional multichannel seismic (MCS) imaging technique allows us to include wide-angle seismic reflection data (offset up to 6 km) in the imaging process. We find that this reflection is continuous along most of the profiles and is present beneath the exposed detachment surface over an area larger than previously estimated from the near-offset MCS sections. Complementary data from on-bottom shots and ocean bottom seismometers constrain both P and S-wave velocities down to 0.5-0.6 km below the seafloor, at approximately the depth of the widespread reflection. The combined seismic data suggest that the interval between the seafloor and the reflection contains serpentinized peridotite. We quantify the amount and distribution of alteration in this layer by using an effective medium theory, and we interpret the results to shed new light on serpentinization processes at Atlantis Massif. IODP drilling results this winter will allow us to compare our interpretation to ground-truth measurements.

Singh, S. C.; Collins, J. A.; Canales, J. P.; Tucholke, B. E.; Detrick, R. S.

2004-12-01

248

Episodic exhumation and relief growth in the Mont Blanc massif, Western Alps from numerical modelling of thermochronology data  

NASA Astrophysics Data System (ADS)

The Pliocene-Quaternary exhumational and topographic evolution of the European Alps and its potential climatic and tectonic controls remain a subject of controversy. Here, we apply inverse numerical thermal-kinematic modelling to a spatially dense thermochronological dataset (apatite fission-track and (U-Th)/He) of both tunnel and surface samples across the Mont Blanc massif in the Western Alps, complemented by new zircon fission-track data, in order to better quantify its Neogene exhumation and relief history. Age-elevation relationships and modelling results show that an episodic exhumation scenario best fits the data. Initiation of exhumation in the Mont Blanc massif at 22 ± 2 Ma with a rate of 0.8 ± 0.15 km/Myr is probably related to NW-directed thrusting during nappe emplacement. Exhumation rates decrease at 6 ± 2 Ma to values of 0.15 ± 0.65 km/Myr, which we interpret to be the result of a general decrease in convergence rates and/or extensive exposure of less erodible crystalline basement rocks from below more easily erodible Mesozoic sediments. Finally, local exhumation rates increase up to 2.0 ± 0.6 km/Myr at 1.7 ± 0.8 Ma. Modelling shows that this recent increase in local exhumation can be explained by valley incision and the associated increase in relief at 0.9 ± 0.8 Ma, leading to erosional unloading, isostatic rebound and additional rock uplift and exhumation. Given the lack of tectonic activity as evidenced by constant thermochronological ages along the tunnel transect, we suggest that the final increase in exhumation and relief in the Mont Blanc massif is the result of climate change, with the initiation of mid-Pleistocene glaciations leading to rapid valley incision and related local exhumation.

Glotzbach, C.; van der Beek, P. A.; Spiegel, C.

2011-04-01

249

Palaeomagnetism in the Sines massif (SW Iberia) revisited: evidences for Late Cretaceous hydrothermal alteration and associated partial remagnetization  

NASA Astrophysics Data System (ADS)

This study revisits the palaeomagnetism of the Sines massif (˜76 Ma) in the southwestern Iberian Margin (Portugal). The palaeomagnetic analysis was complemented by a comprehensive study of the magnetic mineralogy by means of rock magnetic measurements and petrographic observations. The overall dispersion of palaeomagnetic directions (declination ranging between ˜N0° and ˜N50°) and their migration observed during stepwise demagnetizations have revealed the superposition of remanence components. We interpret this complex palaeomagnetic behaviour as related to the regional hydrothermalism associated with the last stages of Late Cretaceous magmatic activity. This environment favoured mineralogical alteration and a partial chemical remagnetization, giving in most samples a composite magnetization, which has been erroneously interpreted as the primary one in a previous study, then leading to a questionable model for Cretaceous Iberia rotation. Nonetheless, for some samples a single component has been isolated. Interesting rock magnetic properties and microscopic observations point to a well-preserved magnetic mineralogy for these samples, with magnetite clearly of primary origin. The associated ChRM mean direction (D/I = 3.9°/46.5°, ?95 = 1.7°, N = 31 samples) then represents the true primary magnetization of the Sines massif. This new palaeomagnetic direction and the corresponding palaeomagnetic pole (long = 332.0°, lat = -79.5°, A95 = 1.7°) agrees with those from the other palaeomagnetic works for the same period and region (e.g. the Sintra and Monchique massifs), yielding a lack of significant rotation of Iberia relative to stable Europe since the uppermost Late Cretaceous (Campanian-Maastrichtian).

Ribeiro, P.; Silva, P. F.; Moita, P.; Kratinová, Z.; Marques, F. O.; Henry, B.

2013-10-01

250

First report of microdiamond in kyanite-garnet schist and coesite in eclogite from the Central Rhodope Massif, Bulgaria  

NASA Astrophysics Data System (ADS)

In this study we have investigated the melange units (Variegated Formation) of the Chepelare region of the Central Rhodope Massif in Bulgaria. These units consist of amphibolites, marbles, eclogites, metaperidotites and kyanite-garnet schists, all incorporated in Carboniferous gneisses (Arda Unit). The sequence closely resembles the microdiamond bearing Kimi Complex of the Greek Rhodopes, but no study has proven a common origin for these two formations. Protoliths of individual rock units have been determined via use of petrography, bulk rock elemental analysis and Sr and Nd isotope datasets, and the major element chemistry of individual crystals has been measured via EPMA. In the kyanite-garnet schist, garnets are almandine rich (Alm72Gross4Prp20), with inclusions of kyanite, biotite, muscovite, apatite, quartz and rutile, and preserve evidence of UHP metamorphism. A 5 ?m carbon inclusion has been confirmed as a diamond via Laser Raman Spectroscopy, with an intense band at 1333 cm-1, comparable to microdiamonds from other UHP metamorphic provinces. In addition, a quartz inclusion surrounded by radial fracturing in a garnet grain from an eclogite sample has been interpreted as a pseudomorph after coesite. UHP conditions are further reinforced by geothermobarometry. For the diamond bearing kyanite-garnet schist samples the Zr in rutile thermometer yields temperatures of ~770 °C, and the Ti in phengite barometer yields pressures of ~3 GPa. Our new results compliment the well documented evidence for UHP conditions in the Greek (southernmost) part of the Rhodope Massif, and new data from kyanite and coesite bearing eclogites from the Pirin and Ograzden Mountains to the west of the Rhodope Massif. Together these new findings, and the wide spread nature of these melange units suggest that UHP conditions in SE Europe are much more widespread than previously believed.

Collings, D. A.; Savov, I. P.; Harvey, J.

2011-12-01

251

Structure, emplacement, and tectonic setting of Late Devonian granitoid plutons in the Teplá-Barrandian unit, Bohemian Massif  

NASA Astrophysics Data System (ADS)

The Št?novice and ?istá granodiorite-tonalite plutons are small (~27 and ~38 km2, respectively) intrusions that are largely discordant to regional ductile structures in the center of the upper-crustal Teplá-Barrandian unit, Bohemian Massif. Their whole-rock and trace-element compositions are consistent with medium-K calc-alkaline magma, generated above a subducted slab in a continental margin arc setting. The U-Pb zircon age of the Št?novice pluton, newly determined at 375 ± 2 Ma using the laser ablation ICP-MS technique, is within the error of the previously published Pb-Pb age of 373 ± 1 Ma for the ?istá pluton. The two plutons also share other characteristics that are typical of concentrically expanded plutons (CEPs), such as elliptical cross-section in plan view, steep contacts, inferred downward-narrowing conical shape, faint normal zoning, and margin-parallel magmatic foliation decoupled from the regional host-rock structures. We interpret the Št?novice and ?istá plutons as representing the initial Late Devonian stage of much more voluminous early Carboniferous arc-related plutonism (represented most typically by the Central Bohemian Plutonic Complex) in the upper crust of the central Bohemian Massif. These two plutons are important tectonic elements in that they indicate an overall shift of the arc-related plutonic activity from the ~NW to the ~SE, accompanied with a general compositional trend of the magmas from medium-K calc-alkaline to shoshonitic/ultrapotassic. Such a pattern is compatible with SE-directed subduction of the Saxothuringian Ocean beneath the Teplá-Barrandian overriding plate as a cause of arc-related magmatism in this part of the Bohemian Massif.

Žák, Ji?í; Kratinová, Zuzana; Truba?, Jakub; Janoušek, Vojt?ch; Sláma, Ji?í; Mrlina, Jan

2011-10-01

252

Structure, emplacement, and tectonic setting of Late Devonian granitoid plutons in the Teplá-Barrandian unit, Bohemian Massif  

NASA Astrophysics Data System (ADS)

The Št?novice and ?istá granodiorite-tonalite plutons are small (~27 and ~38 km2, respectively) intrusions that are largely discordant to regional ductile structures in the center of the upper-crustal Teplá-Barrandian unit, Bohemian Massif. Their whole-rock and trace-element compositions are consistent with medium-K calc-alkaline magma, generated above a subducted slab in a continental margin arc setting. The U-Pb zircon age of the Št?novice pluton, newly determined at 375 ± 2 Ma using the laser ablation ICP-MS technique, is within the error of the previously published Pb-Pb age of 373 ± 1 Ma for the ?istá pluton. The two plutons also share other characteristics that are typical of concentrically expanded plutons (CEPs), such as elliptical cross-section in plan view, steep contacts, inferred downward-narrowing conical shape, faint normal zoning, and margin-parallel magmatic foliation decoupled from the regional host-rock structures. We interpret the Št?novice and ?istá plutons as representing the initial Late Devonian stage of much more voluminous early Carboniferous arc-related plutonism (represented most typically by the Central Bohemian Plutonic Complex) in the upper crust of the central Bohemian Massif. These two plutons are important tectonic elements in that they indicate an overall shift of the arc-related plutonic activity from the ~NW to the ~SE, accompanied with a general compositional trend of the magmas from medium-K calc-alkaline to shoshonitic/ultrapotassic. Such a pattern is compatible with SE-directed subduction of the Saxothuringian Ocean beneath the Teplá-Barrandian overriding plate as a cause of arc-related magmatism in this part of the Bohemian Massif.

Žák, Ji?í; Kratinová, Zuzana; Truba?, Jakub; Janoušek, Vojt?ch; Sláma, Ji?í; Mrlina, Jan

2010-06-01

253

High-pressure metamorphism in the Early Variscan subduction complex of the SW Iberian Massif  

NASA Astrophysics Data System (ADS)

Several units exposed in the boundary area of the Ossa Morena Zone (OMZ) and the South Portuguese Zone (SPZ) preserve petrographic and thermobarometric evidence for an early metamorphic episode (M1), developed under a high-P, low to intermediate-T gradient, related to Early Variscan subduction in the SW Iberian Massif. In the OMZ, these are the Cubito–Moura Unit (Pmin ~ 9.2 kbar and T = 395 ± 45 °C), blueschists from its basal mélange (Pmin ~ 12.4 kbar and T = 310 ± 11 °C), and the underlying Fuenteheridos Group (P = 10.9 ± 0.4 kbar and T = 449 ± 31 °C). The equivalent units in the SPZ are the La Minilla Formation (P = 8.7 ± 0.4 kbar and T = 388 ± 16 °C) and the lawsonite pseudomorphs-bearing Pulo do Lobo Formation. All these units formed part of an approximately NE verging orogenic wedge (present coordinates) developed by the accretion of subducted slabs of the outermost margin of Gondwana and other elements of the Rheic Ocean realm, from at least the Middle Devonian to the lowermost Tournaisian. High-pressure rocks were subsequently emplaced on more internal zones of the OMZ that only experienced a younger high-T, low to intermediate-P metamorphism (M2). This high-T event was coeval with magmatic activity from the uppermost Devonian to the Middle Mississippian, probably as a consequence of transtensional lithospheric thinning and/or delamination of the lower crust and mantle lithosphere of the Gondwana margin. Pre-Late Devonian synorogenic sedimentation in forearc and back-arc basins of the subduction complex evolved to a Late Devonian–Middle Mississippian foreland basin system in early collisional stages. Finally, a new Middle–Late Mississippian fold-and-thrust belt with opposite (SW) vergence and new foreland basins developed during late collisional stages.

Rubio Pascual, Francisco J.; Matas, Jerónimo; Martín Parra, Luis M.

2013-04-01

254

Variable viral and grazer control of prokaryotic growth efficiency in temperate freshwater lakes (French massif central).  

PubMed

The effects of viral lysis and heterotrophic nanoflagellate grazing (top down forces) on prokaryotic mortality and their subsequent impact on their metabolism were estimated in the upper euphotic and deeper aphotic depth of 11 freshwater lakes located in the French Massif Central. The standing stocks of viruses (VA) and heterotrophic nanoflagellate (HNF) varied significantly (p?

Ram, A S Pradeep; Palesse, S; Colombet, J; Sabart, M; Perriere, F; Sime-Ngando, T

2013-09-24

255

Tectonic significance of mafic volcanic rocks in a Mesozoic sequence of the Menderes Massif, West Turkey  

NASA Astrophysics Data System (ADS)

The Mesozoic platform sequence of the Menderes Massif consists of thick succession of detrital and carbonate rocks. In this sequence there are mafic metavolcanic rocks at two different levels. The first level of mafic metavolcanic intercalations is in the Late Triassic detrital-rich series located in the Çalta?? Formation, which is the lowermost unit of the Mesozoic platform. The second level of the mafic metavolcanic rocks is located in the Late Cretaceous-(?)Paleocene Selçuk Formation laying on top of the platform sequence. The Çalta?? Formation, which is composed of mica-schists, thinly-bedded cherts, calc-schist and mafic volcanic intercalations unconformably overlie the Bay?nd?r Formation, which consists of mica-schists, phyllites, and white quartzites of Palaeozoic or probably older age. The mafic volcanic rocks in the Çalta?? Formation are alkaline basalts with within plate characteristics and are formed during an intraplate extension. The Çalta?? Formation is conformably overlain by the Kayaalt? Formation represented by calc-schists, dolomitic marbles, and rudist- and emery-bearing massive marbles in ascending order. The Selçuk Formation overlies the Kayaalt? Formation and consists of a mica-schist matrix with allochthonous blocks of mafic volcanic rocks, metaperidotites, metagabbros and massive marbles. The mafic volcanic rocks in the Selçuk Formation are tholeiitic basalts and are petrologically similar to mid-oceanic basalts. The geological and geochemical characteristics of the mafic metavolcanic rocks in the Çalta?? Formation indicate that during the Late Triassic, the Menderes platform was segmented, probably by the opening of a branch of the Neotethyan Ocean. Between the Late Triassic and the Late Cretaceous, the Menderes carbonate platform was built up. During the Latest Cretaceous-Early Paleocene, a slab of oceanic crust obducted on this platform and provided slices of mafic metavolcanic rocks into the Selçuk Formation.

Güngör, Talip; Erdo?an, Burhan

256

Multiphase carbonate-salt immiscibility in carbonatite melts: data on melt inclusions from the Krestovskiy massif minerals (Polar Siberia)  

Microsoft Academic Search

Minerals of olivine–melilite and olivine–monticellite rocks from the Krestovskiy massif contain primary silicate-salt, carbonate-salt,\\u000a and salt melt inclusions. Silicate-salt inclusions are present in perovskite I and melilite. Thermometric experiments conducted\\u000a on these inclusions at 1,230–1,250°C showed silicate–carbonate liquid immiscibility. Globules of composite carbonate-salt\\u000a melt rich in alkalies, P, S, and Cl separated in silicate melt. Carbonate salt globules in some

L. I. Panina; Polar Siberia

2005-01-01

257

Cadomian (Ediacaran-Cambrian) arc magmatism in the Bitlis Massif, SE Turkey: Magmatism along the developing northern margin of Gondwana  

NASA Astrophysics Data System (ADS)

Small granitic plutons and associated granitic dykes that intrude the pre-Devonian basement of the Bitlis Massif were previously inferred to have a broadly Late Palaeozoic crystallisation age related to the Hercynian orogeny; this was tested during this work. The brittle-ductile-deformed Mutki granite pluton and nearby granitic dykes comprise mainly quartz, alkali feldspar, plagioclase, subordinate biotite, muscovite and rare amphibole. Based on the results of whole-rock major-element and trace-element analysis, the Mutki pluton and associated dykes are inferred to have crystallised from metaluminous, to peraluminous subduction influenced I-type melts. Sm-Nd isotope systematics indicate melting of a mantle source (of notional 1.3 Ga age), with increasing amounts of crustal contamination through time. U/Pb zircon dating of the Mutki granite and a nearby granitic dyke by laser inductively coupled plasma mass spectrometry (LA-ICP-MS) yielded 238U/206Pb crystallisation ages of 545.5 ± 6.1 Ma and 531.4 ± 3.6 Ma, respectively (Ediacaran-Early Cambrian). This shows for the first time that the regionally extensive Bitlis Massif was affected by Cadomian arc-type magmatism. The Ediacaran-Early Cambrian granitic rocks of the Bitlis Massif can be compared with similar-aged metagranitic and metavolcanic rocks within basement units exposed in the Tauride-Anatolide Platform (Menderes-Taurus Block) in western Anatolia and also in NW Turkey. Similar-aged rocks are also exposed in the basement of Iran. All of these magmatic units and their host rocks are interpreted as fragments of a Cadomian active margin bordering the northern margin of Gondwana after its final amalgamation. Formation of the Bitlis Massif granites and contemporaneous granitic units elsewhere in Turkey as fragments of an Andean-type margin adjacent to the Arabian-Nubian Shield is favoured over an alternative explanation as exotic terranes transported > 2000 km eastwards from a Cadomian active margin near West Africa-Amazonia (now NW Africa).

Ustaömer, P. Ayda; Ustaömer, Timur; Collins, Alan S.; Robertson, Alastair H. F.

2009-07-01

258

Post-Variscan exhumation history and long-term landscape evolution of the western Rhenish Massif and surrounding areas  

NASA Astrophysics Data System (ADS)

The Northern Linksrheinisches Schiefergebirge is the western part of the Variscan fold-and-thrust belt in Central Europe. Published apatite fission-track ages cover the range of 159 (10) Ma to 203 (21) Ma in the Northern Linksrheinisches Schiefergebirge. The post-Variscan thermal and exhumation history of the foreland and fold-and-thrust belt in the Northern Linksrheinisches Schiefergebirge is part of the general post-Variscan geological evolution of the Rhenish Massif. To unravel the post-Variscan exhumation history and long-term landscape evolution samples of the RWTH-1 drill cuttings from various depths were analyzed. The well RWTH-1 is located at the Aachen Thrust in Aachen, Germany. The four thermochronometric analyses (fission-track, (U-Th)/He on apatite and zircon each) and furthermore 2-D Modelling with HeFTy were performed at the Devonian to Carboniferous rocks of the RWTH-1. The apatite (U-Th-Sm)/He ages of 5-10 Ma clarify, that the geothermal gradient is very young. The apatite fission-track ages ranging between 43-174 Ma confirm the published AFT data of the surrounding area and points to a post-Triassic exhumation. The zircon (U-Th)/He ages ranging from 198-239 Ma suggest an earlier post-Variscan exhumation, starting during the Lower-Middle Triassic. Comparing these results to existing geological records enable us to identify and quantify the relevant tectonic processes that shape the landscape of the western Rhenish Massif.

Sehrt, M.; Glasmacher, U. A.; Kukla, P.; Stockli, D. F.; Wipf, M.

2010-05-01

259

Igneous scapolite-bearing associations in the Chaîne des Puys, Massif Central (France) and Atakor (Hoggar, Algeria)  

NASA Astrophysics Data System (ADS)

A scapolite+amphibole+clinopyroxene+Fe-Ti oxide+apatite association has been found as megacrysts in tephra from the Enval-Volvic volcanic line, east of the Chaîne des Puys (Massif Central, France) and in the cinder cone of the Segueïka volcano (Atakor, Algeria). In both kinds, lavahosts are basanites. Although never seen together in a single xenolith, a study of their inclusions indicates close genetic relationship between all 5 phases. This association must be considered as a paragenesis that crystallized within a narrow PT range. Volcanological, petrological and geochemical data suggest that these megacrysts are high-pressure phenocrysts rather than mechanically desintegrated fragments derived from coarse rocks. The composition of the amphibole suggests a pressure between 5 and 15 kb; Fe-Ti oxides imply a temperature close to 1,100° C. Crystallization of sulfur-rich scapolite involves a high fSO3, and therefore a high fO2, remarkable for such relatively undifferenciated alkalic magmas. Coexisting Fe-Ti oxides indicate a fO2 close to 10-6 bar. Such conditions imply that H2O was a major component of the gaseous phase. This high water content can be explained in terms of derivation from an hydrated upper mantle source. This is in agreement with other petrological evidences indicating that the basic magmas of the Massif Central crystallized under high fSO3 conditions.

Boivin, P.; Camus, G.

1981-12-01

260

View facing northeast (60°) of Structure 259, other transmission lines ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View facing northeast (60°) of Structure 25-9, other transmission lines and small farmstead visible in background - Havre Rainbow Transmission Line, Havre City to Great Falls vicinity, Montana, Great Falls, Cascade County, MT

261

Historic photograph, April, 1968. West and south elevations, looking northeast. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Historic photograph, April, 1968. West and south elevations, looking northeast. U.S. Army Photograph; Corps of Engineers, New England Division. File number 844. - Watertown Arsenal, Building No. 313, Talcott Avenue, Watertown, Middlesex County, MA

262

GENERAL VIEW AT NORTHEAST CORNER OF SITE (END OF INGLE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL VIEW AT NORTHEAST CORNER OF SITE (END OF INGLE AVENUE) LOOKING WEST AT PORTION OF CONGRESSIONAL CEMETERY ADDED IN 1874. - Congressional Cemetery, 1801 E Street, Southeast, Washington, District of Columbia, DC

263

1. SOUTH VIEW OF NORTHWEST SIDE, WITH NORTHEAST SIDE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. SOUTH VIEW OF NORTHWEST SIDE, WITH NORTHEAST SIDE OF MINE OFFICE ON RIGHT OF PHOTO - Juniata Mill Complex, Assay Office, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

264

2. SOUTHSOUTHWEST VIEW OF NORTHEAST CORNER, NORTH AND EAST SIDES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. SOUTH-SOUTHWEST VIEW OF NORTHEAST CORNER, NORTH AND EAST SIDES - Juniata Mill Complex, Camp Bunk House, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

265

2. NORTHEAST VIEW OF SOUTHWEST CORNER, WEST AND SOUTH SIDES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. NORTHEAST VIEW OF SOUTHWEST CORNER, WEST AND SOUTH SIDES - Juniata Mill Complex, Mine & Camp Residence, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

266

2. NORTHEAST VIEW OF SOUTH SIDE WITH ADDITION ON SOUTHWEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. NORTHEAST VIEW OF SOUTH SIDE WITH ADDITION ON SOUTHWEST - Juniata Mill Complex, Mine & Camp Residence, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

267

2. SOUTH VIEW OF NORTHWEST AND NORTHEAST SIDES (NORTH CORNER). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. SOUTH VIEW OF NORTHWEST AND NORTHEAST SIDES (NORTH CORNER). NORTHWEST SIDE OF ASSAY OFFICE ON LEFT - Juniata Mill Complex, Mine Office, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

268

3. NORTHEAST VIEW OF SOUTH SIDE, WITH ADDITION ON SOUTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. NORTHEAST VIEW OF SOUTH SIDE, WITH ADDITION ON SOUTHEAST SIDE - Juniata Mill Complex, Mine & Camp Residence, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

269

1. SOUTHWEST VIEW OF NORTHEAST CORNER, NORTH AND EAST SIDES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. SOUTHWEST VIEW OF NORTHEAST CORNER, NORTH AND EAST SIDES - Juniata Mill Complex, Mine & Camp Residence, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

270

2. VIEW WESTSOUTHWEST OF NORTHEAST AND SOUTHEAST SIDES Juniata ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW WEST-SOUTHWEST OF NORTHEAST AND SOUTHEAST SIDES - Juniata Mill Complex, Mine Camp Building, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

271

2. NORTHEAST VIEW OF SOUTHWEST CORNER, WEST AND SOUTH SIDES. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. NORTHEAST VIEW OF SOUTHWEST CORNER, WEST AND SOUTH SIDES. PARTIALLY SUNKEN TUB ON LEFT SIDE. - Juniata Mill Complex, Pump House, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

272

4. VIEW SOUTHSOUTHEAST OF NORTHWEST AND NORTHEAST SIDES OF BUILDING. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. VIEW SOUTH-SOUTHEAST OF NORTHWEST AND NORTHEAST SIDES OF BUILDING. COLLAPSED STRUCTURE IN FOREGROUND - Juniata Mill Complex, Mine Camp Building, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

273

7. CONTEXTUAL VIEW NORTHEAST TOWARDS FEATURES 6 (LEFT) AND 7 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. CONTEXTUAL VIEW NORTHEAST TOWARDS FEATURES 6 (LEFT) AND 7 (RIGHT) WITHIN MILL COMPLEX. - Juniata Mill Complex, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

274

3. NORTHEAST VIEW OF SOUTHWEST CORNER (WEST AND SOUTH SIDES) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. NORTHEAST VIEW OF SOUTHWEST CORNER (WEST AND SOUTH SIDES) - Juniata Mill Complex, Camp Bunk House, 22.5 miles Southwest of Hawthorne, between Aurora Crater & Aurora Peak, Hawthorne, Mineral County, NV

275

3. NORTHEAST SIDE OF OFFICE BUILDING ON SOUTH MAIN STREET, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. NORTHEAST SIDE OF OFFICE BUILDING ON SOUTH MAIN STREET, FACING WEST. SOUTHEAST END OF FACTORY IS VISIBLE LEFT OF CENTER. - Savage Tire Factory, Office Building, 2301 Main Street, San Diego, San Diego County, CA

276

6. VIEW NORTHEAST, WEST END OF DAM DURING CONSTRUCTION OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. VIEW NORTHEAST, WEST END OF DAM DURING CONSTRUCTION OF FISHWAY, DECEMBER 1995, SHOWING REMOVAL OF PLANKING - Norwich Water Power Company, Dam, West bank of Shetucket River opposite Fourteenth Street, Greenville section, Norwich, New London County, CT

277

51. LOOKING NORTHEAST AT EIMCO WASTE WATER TREATMENT THICKENER No. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

51. LOOKING NORTHEAST AT EIMCO WASTE WATER TREATMENT THICKENER No. 2, ELECTRIC POWERHOUSE No. 2, AND OUTDOOR ELECTRICAL SUBSTATION IN BACKGROUND. (Jet Lowe) - U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela River, Duquesne, Allegheny County, PA

278

15. Detail, cracks evidencing structural failure, northeast rear, view to ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

15. Detail, cracks evidencing structural failure, northeast rear, view to southwest, 90mm lens. - Benicia Arsenal, Powder Magazine No. 5, Junction of Interstate Highways 680 & 780, Benicia, Solano County, CA

279

13. Detail, typical window with fireproof shutters closed, northeast rear, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. Detail, typical window with fireproof shutters closed, northeast rear, view to southwest, 135mm lens. Note cracks evidencing structural failure. - Benicia Arsenal, Powder Magazine No. 5, Junction of Interstate Highways 680 & 780, Benicia, Solano County, CA

280

12. Detail, typical window with fireproof shutters open, northeast rear, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. Detail, typical window with fireproof shutters open, northeast rear, view to southwest, 135mm lens. Note cracks evidencing structural failure. - Benicia Arsenal, Powder Magazine No. 5, Junction of Interstate Highways 680 & 780, Benicia, Solano County, CA

281

14. Detail, crack evidencing structural failure, northeast rear, view to ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. Detail, crack evidencing structural failure, northeast rear, view to southwest, 90mm lens. Note failure of sandstone lintel above window. - Benicia Arsenal, Powder Magazine No. 5, Junction of Interstate Highways 680 & 780, Benicia, Solano County, CA

282

View northeast, wharf B decking, showing different decking materials ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northeast, wharf B decking, showing different decking materials - U.S. Coast Guard Sandy Hook Station, Western Docking Structure, West of intersection of Canfield Road & Hartshorne Drive, Highlands, Monmouth County, NJ

283

View northeast, wharf B, showing sloping to water, connection to ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northeast, wharf B, showing sloping to water, connection to pier C - U.S. Coast Guard Sandy Hook Station, Western Docking Structure, West of intersection of Canfield Road & Hartshorne Drive, Highlands, Monmouth County, NJ

284

View northeast, wharf A decking detail, showing floor of former ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northeast, wharf A decking detail, showing floor of former light attendant station (las) or boathouse - U.S. Coast Guard Sandy Hook Station, Western Docking Structure, West of intersection of Canfield Road & Hartshorne Drive, Highlands, Monmouth County, NJ

285

Credit BG. Southeast and northeast facades of concrete block structure ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Credit BG. Southeast and northeast facades of concrete block structure built in the late 1960s. It is now used to store miscellaneous equipment - Edwards Air Force Base, North Base, Liquid Oxygen Storage Facility, Second Street, Boron, Kern County, CA

286

4. PERSPECTIVE VIEW TO THE NORTHEAST OF THE CREW SHELTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. PERSPECTIVE VIEW TO THE NORTHEAST OF THE CREW SHELTER IN AR-8. - Edwards Air Force Base, South Base, Rammed Earth Aircraft Dispersal Revetments, Western Shore of Rogers Dry Lake, Boron, Kern County, CA

287

VIEW LOOKING NORTHEAST AT EARTH MOUND. NOTE THE RECTANGULAR OPENINGS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW LOOKING NORTHEAST AT EARTH MOUND. NOTE THE RECTANGULAR OPENINGS USED FOR OBSERVATION EQUIPMENT AND PERISCOPE TOPS. - Marshall Space Flight Center, Redstone Rocket (Missile) Test Stand, Dodd Road, Huntsville, Madison County, AL

288

12. VIEW OF NATURAL BRIDGE OVERLOOK PARKING AREA, FACING NORTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. VIEW OF NATURAL BRIDGE OVERLOOK PARKING AREA, FACING NORTHEAST. NOTE DETERIORATION OF WALL AND USE OF AESTHETICALLY INTRUSIVE FENCING. - Bryce Canyon National Park Rim Road, State Highway 63 to Rainbow Point, Tropic, Garfield County, UT

289

4. DETAIL VIEW, LOOKING NORTHEAST, SHOWING BEARING BLOCK AND CONCRETE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. DETAIL VIEW, LOOKING NORTHEAST, SHOWING BEARING BLOCK AND CONCRETE FILLED CYLINDRICAL STEEL RING PIER, WEST TRUSS OF MAIN SPAN AT SOUTH END - Little Missouri River Bridge, Spanning Little Missouri River at CR 179, Okolona, Clark County, AR

290

4. View of bridge deck from northeast approach (bridge deck ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. View of bridge deck from northeast approach (bridge deck from southwest approach is virtually identical - Big Cottonwood River Bridge No. 246, Spanning Big Cottonwood River at Cottonwood Street (City Road No. 165), New Ulm, Brown County, MN

291

Topographic view of Applegate River Bridge, view looking northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Topographic view of Applegate River Bridge, view looking northeast - Applegate River Bridge No. 01985, Spanning Applegate River at Milepost 6.14 of Jacksonville Highway (OR-238), Murphy, Josephine County, OR

292

18. EASTERNMOST 12FOOT CAMERA TOWER. Looking northeast. Edwards Air ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. EASTERNMOST 12-FOOT CAMERA TOWER. Looking northeast. - Edwards Air Force Base, South Base Sled Track, Edwards Air Force Base, North of Avenue B, between 100th & 140th Streets East, Lancaster, Los Angeles County, CA

293

32. GENERAL VIEW LOOKING NORTHEAST, SHOWING DRAFT CONES AND INTAKE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

32. GENERAL VIEW LOOKING NORTHEAST, SHOWING DRAFT CONES AND INTAKE TUBES. - Wilson Dam & Hydroelectric Plant, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

294

1. VIEW OF DRYDOCK NO. 4, LOOKING NORTHEAST, FACING THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW OF DRYDOCK NO. 4, LOOKING NORTHEAST, FACING THE HEAD OF THE DRYDOCK - U.S. Naval Base, Pearl Harbor, Dry Dock No. 4, West of State Route 92, West of Nimitz Gate, Pearl City, Honolulu County, HI

295

3. View northeast, west facade of Lake Forest (original Forest ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. View northeast, west facade of Lake Forest (original Forest Cottage structure incorporated into renamed structure) - Lake Placid Club, Forest Wing, East side of Mirror Lake Drive, North of State Route 86 & Main, North Elba, Essex County, NY

296

5. VIEW OF SOUTHEAST AND NORTHEAST ELEVATIONS, SHOWING BRIDGE TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. VIEW OF SOUTHEAST AND NORTHEAST ELEVATIONS, SHOWING BRIDGE TO NAPPING BUILDING AT LEFT AND STEEL I-BEAM HOIST ON ROOF WITH PARAPET, LOOKING WEST - Massachusetts Mills, Cloth Room-Section 15, 95 Bridge Street, Lowell, Middlesex County, MA

297

Interior view, first floor, northeast chamber, view looking to fireplace ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior view, first floor, northeast chamber, view looking to fireplace and mantel; note six panel door, picture rail, and paneling below the surbase - Tavern-Store-Kitchen, Route 29 & Route 631, Madison, Madison County, VA

298

Detail of monitors from west side; camera facing northeast. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of monitors from west side; camera facing northeast. - Mare Island Naval Shipyard, Equipment & Recruitment Storehouse, Waterfront Avenue, northwest corner of Waterfront Avenue & Fifth Street, Vallejo, Solano County, CA

299

Detail of chimney and eaves southeast corner; camera facing northeast. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of chimney and eaves southeast corner; camera facing northeast. - Mare Island Naval Shipyard, Equipment & Recruitment Storehouse, Waterfront Avenue, northwest corner of Waterfront Avenue & Fifth Street, Vallejo, Solano County, CA

300

4. VIEW SHOWING EXCAVATION IN ARIZONA CANAL, 8 MILES NORTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. VIEW SHOWING EXCAVATION IN ARIZONA CANAL, 8 MILES NORTHEAST OF PHOENIX. NOTE MEN DRILLING AND EXCAVATING IN OPERATION; CAMELBACK MOUNTAIN IN THE DISTANCE Photographer: Walter J. Lubken. No date - Arizona Canal, North of Salt River, Phoenix, Maricopa County, AZ

301

8. Interior view of first floor kitchen. View to northeast. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. Interior view of first floor kitchen. View to northeast. - U.S. Customs Service Port of Roosville, Immigration & Naturalization Service Residence, 45 feet southwest of Main Port Building, Eureka, Lincoln County, MT

302

VIEW NORTHEAST, LEFT BUILDING 40 WIRE WAREHOUSE (1915) RIGHT BUILDING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW NORTHEAST, LEFT BUILDING 40 WIRE WAREHOUSE (1915) RIGHT BUILDING 42 ROPE SHOP (1910) - John A. Roebling's Sons Company & American Steel & Wire Company, South Broad, Clark, Elmer, Mott & Hudson Streets, Trenton, Mercer County, NJ

303

10. VIEW TO NORTHEAST ALONG NORTHWEST SPILLWAY ABUTMENT; SERVICE VEHICLE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. VIEW TO NORTHEAST ALONG NORTHWEST SPILLWAY ABUTMENT; SERVICE VEHICLE GARAGE IN BACKGROUND. - Prado Dam, Spillway, Santa Ana River near junction of State Highways 71 & 91, Corona, Riverside County, CA

304

166. VIEW FROM NORTHWEST TO SOUTHEAST IN THE NORTHEAST QUADRANT. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

166. VIEW FROM NORTHWEST TO SOUTHEAST IN THE NORTHEAST QUADRANT. VIEW LOOKING DOWN CORRIDOR OF BUTTRESSES. STARTING CASEMATE BUTTRESS a-17 THROUGH CASEMATE b'-3. - Fort Sumter, Charleston, Charleston County, SC

305

1. FLAME DEFLECTOR FROM FERROCEMENT APRON, VIEW TOWARDS NORTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. FLAME DEFLECTOR FROM FERROCEMENT APRON, VIEW TOWARDS NORTHEAST. - Glenn L. Martin Company, Titan Missile Test Facilities, CaptiveTest Stand D-3, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

306

DETAIL TOP VIEW OF AERIAL TRAMWAY DRIVE MECHANISM, LOOKING NORTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

DETAIL TOP VIEW OF AERIAL TRAMWAY DRIVE MECHANISM, LOOKING NORTHEAST. THE FRICTION BRAKING SYSTEM CAN BE SEEN IN SHADOW ABOVE THE LARGE CABLE WHEEL BELOW. - Keane Wonder Mine, Park Route 4 (Daylight Pass Cutoff), Death Valley Junction, Inyo County, CA

307

VIEW LOOKING NORTHEAST SHOWING TIPPLE FOR LOADING COKED COAL INTO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW LOOKING NORTHEAST SHOWING TIPPLE FOR LOADING COKED COAL INTO RAILROAD CARS (FRONT), COAL STORAGE BIN AND TIPPLE FOR COAL TO BE CHARGED IN FURNACES (BACK) - Alverton Coke Works, State Route 981, Alverton, Westmoreland County, PA

308

View northeast, oblique contextual view of hoboken rail yard in ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northeast, oblique contextual view of hoboken rail yard in immediate background, Manhattan Skyline in distance. - Delaware, Lackawanna & Western Railroad Freight & Rail Yard, Long Slip Canal, New Jersey Transit Hoboken Rail Yard, Hoboken, Hudson County, NJ

309

4. View northeast of west (partial) and south elevations. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. View northeast of west (partial) and south elevations. - Natick Research & Development Laboratories, Climatic Chambers Building, U.S. Army Natick Research, Development & Engineering Center (NRDEC), Natick, Middlesex County, MA

310

1. View Northeast, West Front, Elevation of Building 7 Note ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. View Northeast, West Front, Elevation of Building 7 Note opening to shaft to beer vault in foreground - Weissner Brewery, Building Nos. 6 & 7, 1700 North Gay Street, Baltimore, Independent City, MD

311

8. DETAIL OF NORTHEAST ELEVATION SHOWING NEON TWA SIGN AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. DETAIL OF NORTHEAST ELEVATION SHOWING NEON TWA SIGN AND ROOF MASTS. LOOKING SOUTHWEST. - TWA Maintenance Hangar, South side of Tinicum Island Road, Philadelphia International Airport, Philadelphia, Philadelphia County, PA

312

10. LIGHT TOWER, VIEW NORTHEAST FROM LIGHT PLATFORM, SOUTHWEST SIDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. LIGHT TOWER, VIEW NORTHEAST FROM LIGHT PLATFORM, SOUTHWEST SIDE OF BOAT HOUSE AND KEEPER'S HOUSE, WITH DETAIL OF RAILING IN FOREGROUND - Grindle Point Light Station, Western end of Ferry Road on Grindle Point, Islesboro, Waldo County, ME

313

General overview. Looking toward caisson end. View facing northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

General overview. Looking toward caisson end. View facing northeast - U.S. Naval Base, Pearl Harbor, Dry Dock No. 1, On northern shoreline of shipyard, near intersection of Avenue G & Sixth Street, Pearl City, Honolulu County, HI

314

Interior view, second floor, northeast chamber, view looking east to ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior view, second floor, northeast chamber, view looking east to fireplace and mantel; note window with four-over-four glazed sash to south of fireplace - Tavern-Store-Kitchen, Route 29 & Route 631, Madison, Madison County, VA

315

VIEW, LOOKING NORTHEAST, OF CHEMISTRY LAB, LOCATED ON MEZZANINE ABOVE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW, LOOKING NORTHEAST, OF CHEMISTRY LAB, LOCATED ON MEZZANINE ABOVE AND EAST OF FLOTATION CELLS. MAIN USE WAS SAMPLE ANALYSIS TO DETERMINE OPTIMUM REAGENT MIXES AND QUANTITIES. - Shenandoah-Dives Mill, 135 County Road 2, Silverton, San Juan County, CO

316

6. View northeast of Ten Acre Lot with Joseph Fry ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. View northeast of Ten Acre Lot with Joseph Fry Farm complex (center) and Beehive House (right)in the background - Joseph Fry Farm Landscape, 2153 South County Trail Road (U.S. Route 2), East Greenwich, Kent County, RI

317

9. Boathouse, view south, northeast and northwest sides, with top ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Boathouse, view south, northeast and northwest sides, with top of lighthouse tower in distance - Squirrel Point Light Station, Off Highway 127, Steen Road to end of Bald Head Road, .8 mile down footpath, Arrowsic, Sagadahoc County, ME

318

4. VIEW OF WEST SIDE OF POWER HOUSE LOOKING NORTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. VIEW OF WEST SIDE OF POWER HOUSE LOOKING NORTHEAST. PHOTOGRAPH TAKEN FROM INSIDE TIPPLE AND CLEANING PLANT. - Eureka No. 40, Powerhouse, West side of State Route 160, Scalp Level, Cambria County, PA

319

1. STONE CABIN II FROM ABOVE NORTHEAST CORNER. CAMERA POINTED ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. STONE CABIN II FROM ABOVE NORTHEAST CORNER. CAMERA POINTED WEST. - Florida Mountain Mining Sites, Stone Cabin II, West slope Florida Mountain, East of Empire State Mine below summit, Silver City, Owyhee County, ID

320

3. In context, from southwest facing northeast, playground between buildings. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. In context, from southwest facing northeast, playground between buildings. Building 12-A on right, Building 12-B on left. - Clark Howell Homes, Building 12-A, 500 Lovejoy Street, Atlanta, Fulton County, GA

321

3. In context, from southwest facing northeast, playground between buildings. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. In context, from southwest facing northeast, playground between buildings. Building 12-A, right, Building 12-A, left. - Clark Howell Homes, Building 12-B, 516 Lovejoy Street, Atlanta, Fulton County, GA

322

5. Photocopy of photograph, circa 1930 VIEW NORTHEAST SHOWING WEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Photocopy of photograph, circa 1930 VIEW NORTHEAST SHOWING WEST AND SOUTH ELEVATIONS - Thomas Asylum for Orphan & Destitute Indians, Dining Hall, Route 438, Cattaraugas Reservation, Irving, Chautauqua County, NY

323

8. VIEW OF SOUTHWEST END OF GERMAN VILLAGE LOOKING NORTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. VIEW OF SOUTHWEST END OF GERMAN VILLAGE LOOKING NORTHEAST. - Dugway Proving Ground, German-Japanese Village, German Village, South of Stark Road, in WWII Incendiary Test Area, Dugway, Tooele County, UT

324

VIEW LOOKING NORTHEAST FROM SECTION L TOWARDS THE HOUSE. THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW LOOKING NORTHEAST FROM SECTION L TOWARDS THE HOUSE. THE STRUCTURE PARTIALLY VISIBLE ON THE RIGHT IS THE DREXEL FAMILY MAUSOLEUM - Woodlands Cemetery, 4000 Woodlands Avenue, Philadelphia, Philadelphia County, PA

325

5. PERSPECTIVE VIEW LOOKING NORTHEAST FROM ATOP OVENS SHOWING LARRY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. PERSPECTIVE VIEW LOOKING NORTHEAST FROM ATOP OVENS SHOWING LARRY CARS (LEFT) AND INTERMEDIATE TIPPLE (CENTER). NEXT BLOCK OF OVENS AT FAR RIGHT. - Shoaf Mine & Coke Works, East side of Shoaf, off Township Route 472, Shoaf, Fayette County, PA

326

1. HOUSING UNIT NO. 6, FROM NORTHEAST Sublet Mine ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. HOUSING UNIT NO. 6, FROM NORTHEAST - Sublet Mine No. 6, Housing Unit No. 6, East side of Willow Creek Valley, east of County Road No. 306, 3 miles north of U.S. Highway 189, Kemmerer, Lincoln County, WY

327

View northeast toward west side of building 68. View partially ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northeast toward west side of building 68. View partially obscured by automobiles and storage structures. - Naval Air Station North Island, Seaplane Hangars, Roe Street, North Island, San Diego, San Diego County, CA

328

112. REFRIGERANT CONDENSER TANKS AND PRESSURE CONTROLS IN NORTHEAST CORNER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

112. REFRIGERANT CONDENSER TANKS AND PRESSURE CONTROLS IN NORTHEAST CORNER OF MECHANICAL EQUIPMENT ROOM (201), LSB (BLDG. 751) - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 East, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

329

PERSPECTIVE NORTHEAST. NOTE TYPICAL NEW HAMPSHIRE COVERED BRIDGE HOUSING, WITH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

PERSPECTIVE NORTHEAST. NOTE TYPICAL NEW HAMPSHIRE COVERED BRIDGE HOUSING, WITH UPPER PORTION OF TRUSSES LEFT EXPOSED AND VERTICAL PLANK SIDING COVERING THE LOWER PORTION. - Mechanic Street Bridge, Spanning Israel River, Lancaster, Coos County, NH

330

Recommendations for Northeast Corridor Transportation. Main Report. Volume 2.  

National Technical Information Service (NTIS)

Volume 2 includes discussions of the Northeast Corridor's population growth patterns and the region's transportation system, an evaluation methodology, descriptions of interim and long term alternative systems, and a comparative analysis of the alternativ...

M. Miller M. Cheslow N. T. Ebersole J. Gerba D. J. Igo

1971-01-01

331

22. In context, from southwest facing northeast, typical courtyard formed ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. In context, from southwest facing northeast, typical courtyard formed by "U" building configuration, south side of Building E-3, left. - Clark Howell Homes (Public Housing), Bounded by North Avenue, Lovejoy Street, Mills Street & Luckie Street, Atlanta, Fulton County, GA

332

2. VIEW TO NORTHEAST (ORE RECEIVING PLATFORM OUT OF VIEW ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW TO NORTHEAST (ORE RECEIVING PLATFORM OUT OF VIEW TO RIGHT). - Vanadium Corporation of America (VCA) Naturita Mill, Sampling Building & Ore Receiving Platform, 3 miles Northwest of Naturita, between Highway 141 & San Miguel River, Naturita, Montrose County, CO

333

14. September 20, 1950, source not known VIEW NORTHEAST, SOUTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. September 20, 1950, source not known VIEW NORTHEAST, SOUTH ELEVATIONS, MECHANICS SAVINGS BANK AND ADJOINING BUILDING TO EAST - Mechanics Savings Bank Building, 80 Pearl Street, Hartford, Hartford County, CT

334

BASEMENT, A view looking northeast that captures the storage lockers ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

BASEMENT, A view looking northeast that captures the storage lockers in the woman's side of the change room (Room 119A) - Department of Energy, Mound Facility, Isolated Building (I Building), One Mound Road, Miamisburg, Montgomery County, OH

335

NORTHEAST (SIDE) AND NORTHWEST (REAR) ELEVATIONS OF BUILDING. VIEW TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

NORTHEAST (SIDE) AND NORTHWEST (REAR) ELEVATIONS OF BUILDING. VIEW TO SOUTH - Plattsburgh Air Force Base, Industrial Wastewater Treatment & Disposal Facility, Off LeMay Road, outside SAC Alert Area, Plattsburgh, Clinton County, NY

336

SOUTHEAST (FRONT) AND NORTHEAST (SIDE) ELEVATIONS OF BUILDING. VIEW TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

SOUTHEAST (FRONT) AND NORTHEAST (SIDE) ELEVATIONS OF BUILDING. VIEW TO WEST - Plattsburgh Air Force Base, Industrial Wastewater Treatment & Disposal Facility, Off LeMay Road, outside SAC Alert Area, Plattsburgh, Clinton County, NY

337

Facility No. 175, exterior oblique view of northeast and northwest ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Facility No. 175, exterior oblique view of northeast and northwest sides, corner of Facility No. 176 is in background - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

338

5. VIEW OF GENERAL REFRACTORIES COMPANY (GREFCO) HOUSES, NORTHEAST SIDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. VIEW OF GENERAL REFRACTORIES COMPANY (GREFCO) HOUSES, NORTHEAST SIDE OF PENNSYLVANIA AVENUE LOOKING NORTH. HOUSE NO. 77 AT RIGHT. - Town of Mount Union, Near U.S. Highway 522, Mount Union, Huntingdon County, PA

339

15. SOUTHEAST AND NORTHEAST WALLS OF CREW SHELTER LOCATED BETWEEN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

15. SOUTHEAST AND NORTHEAST WALLS OF CREW SHELTER LOCATED BETWEEN THE PURSUIT PLANE BAYS OF AR-9. - Edwards Air Force Base, South Base, Rammed Earth Aircraft Dispersal Revetments, Western Shore of Rogers Dry Lake, Boron, Kern County, CA

340

Detail of northeast corner showing metal plates and poles of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of northeast corner showing metal plates and poles of unknown purpose. - Fitzsimons General Hospital, Nurses' Quarters, Southwest Corner of West Harlow Avenue, & South Eighth Street, Aurora, Adams County, CO

341

92. VIEW OF CHART RECORDERS AND PERSONAL COMPUTER LINING NORTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

92. VIEW OF CHART RECORDERS AND PERSONAL COMPUTER LINING NORTHEAST CORNER OF AUTOPILOT ROOM - Vandenberg Air Force Base, Space Launch Complex 3, Launch Operations Building, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

342

LOOKING NORTHEAST TOWARD NORTHERN AVE. SWING BRIDGE. BOSTON TEA PARTY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

LOOKING NORTHEAST TOWARD NORTHERN AVE. SWING BRIDGE. BOSTON TEA PARTY SHIP AT ANCHOR IN FOREGROUND. - Northern Avenue Swing Bridge, Spanning Fort Point Channel at boundary between Boston & South Boston, Boston, Suffolk County, MA

343

AERIAL VIEW, LOOKING NORTHEAST, SHOWING ANIMAS RIVER IN CENTER FOREGROUND, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

AERIAL VIEW, LOOKING NORTHEAST, SHOWING ANIMAS RIVER IN CENTER FOREGROUND, POWERHOUSE IN LEFT CENTER, AND SHENANDOAH-DIVES (MAYFLOWER) MILL AND TAILINGS PONDS IN DISTANCE. - Shenandoah-Dives Mill, 135 County Road 2, Silverton, San Juan County, CO

344

6. VIEW LOOKING NORTHEAST, OFFICE BUILDING AT RIGHT AND WORKSHOP ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. VIEW LOOKING NORTHEAST, OFFICE BUILDING AT RIGHT AND WORKSHOP WITH SAWTOOTH ROOF AT LEFT - Ichabod T. Williams & Sons Sawmill & Veneer Plant, Roosevelt Avenue at Carteret Avenue, Carteret, Middlesex County, NJ

345

13. VIEW LOOKING NORTHEAST, SHOWING SHIPPING ROOMS AND VENEER MILL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. VIEW LOOKING NORTHEAST, SHOWING SHIPPING ROOMS AND VENEER MILL (AT RIGHT), AND ENGINE ROOM (AT LEFT) - Ichabod T. Williams & Sons Sawmill & Veneer Plant, Roosevelt Avenue at Carteret Avenue, Carteret, Middlesex County, NJ

346

1. General view looking northeast of the buildings remaining from ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. General view looking northeast of the buildings remaining from the fleet supply base. Left to right: Storehouse #1, Storehouse #2, Powder plant. - U.S. Navy Fleet Supply Base, Storehouse No. 1, 830 Third Avenue, Brooklyn, Kings County, NY

347

15. Detail, northeast facade, operator's bow window and tower, showing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

15. Detail, northeast facade, operator's bow window and tower, showing knee braces carried on stone ancons used to support eaves, view to northwest, 90mm lens. - Southern Pacific Depot, 559 El Camino Real, San Carlos, San Mateo County, CA

348

10. Detail of truss located on top the northeast pier, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. Detail of truss located on top the northeast pier, looking southwest. - Bridge No. 4800, Spanning Minnesota River on Trunk Highway 4 between Brown & Nicollet Counties, Sleepy Eye, Brown County, MN

349

SOUTHEAST FRONT AND NORTHEAST SIDE. Looking northwest from top of ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

SOUTHEAST FRONT AND NORTHEAST SIDE. Looking northwest from top of protective berm - Edwards Air Force Base, South Base Sled Track, Water Pump Station, Area "O" at east end, northwest of fuel storage, Lancaster, Los Angeles County, CA

350

SOUTHEAST AND NORTHEAST SIDES. Looking west Edwards Air Force ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

SOUTHEAST AND NORTHEAST SIDES. Looking west - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Fuel & Water Tank, Test Area 1-115, northwest end of Saturn Boulevard, Boron, Kern County, CA

351

13. View of historic district looking northeast, with road to ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. View of historic district looking northeast, with road to left and Ogeechee River in background - Richmond Hill Plantation, East of Richmond Hill on Ford Neck Road, Richmond Hill, Bryan County, GA

352

1. VIEW TO NORTHEAST ACROSS RICHMOND INNER HARBOR FROM RICHMOND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW TO NORTHEAST ACROSS RICHMOND INNER HARBOR FROM RICHMOND SHIPYARD NO. 3. - Rosie the Riveter National Historical Park, Ford Assembly Plant, 1400 Harbour Way South, Richmond, Contra Costa County, CA

353

22. View of historic district looking northeast; road in foreground ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. View of historic district looking northeast; road in foreground and Ogeechee River in background - Richmond Hill Plantation, East of Richmond Hill on Ford Neck Road, Richmond Hill, Bryan County, GA

354

8. View of Sterling Creek Marsh looking northeast across the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. View of Sterling Creek Marsh looking northeast across the berm with the marsh to the left - Richmond Hill Plantation, Sterling Creek Marsh, East of Richmond Hill on Ford Neck Road, Richmond Hill, Bryan County, GA

355

Interior, looking northeast Beale Air Force Base, Perimeter Acquisition ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior, looking northeast - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Microwave Equipment Building, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

356

2. VIEW NORTHEAST, SOUTH FRONT OF DAYVILLE MILLS COMPLEX LOOKING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW NORTHEAST, SOUTH FRONT OF DAYVILLE MILLS COMPLEX LOOKING ACROSS ROUTE 101, MAIN MILL BUILDING - Dayville Mills Hydroelectric Facility, North side of Route 101, .5 mile west of Route 395, Killingly Center, Windham County, CT

357

7. OBLIQUE CONTEXTUAL VIEW FROM NORTHEAST, SHOWING NORTH AND EAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. OBLIQUE CONTEXTUAL VIEW FROM NORTHEAST, SHOWING NORTH AND EAST WALLS OF ADDITION, AND ALL OF EAST WALL OF MILLS HALL NORTH WING. - Mills Hall, Mills College, 5000 MacArthur Boulevard, Oakland, Alameda County, CA

358

17. NORTHEAST CORNER OF BUILDING 345 (ENTRY CONTROL BUILDING) IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. NORTHEAST CORNER OF BUILDING 345 (ENTRY CONTROL BUILDING) IN STORAGE AREA. - Loring Air Force Base, Weapons Storage Area, Northeastern corner of base at northern end of Maine Road, Limestone, Aroostook County, ME

359

7. View northeast showing 61 Sherman Avenue located at the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. View northeast showing 61 Sherman Avenue located at the eastern end of the village. - Kenyon Village, Kenyon School Road, Sherman Avenue, & Lewiston Avenue, Richmond (historical), Providence County, RI

360

3. EXTERIOR, VIEW TO NORTHEAST, AT NEW SITE (HERITAGE PARK). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR, VIEW TO NORTHEAST, AT NEW SITE (HERITAGE PARK). SHERMAN-GILBERT HOUSE AT LEFT; BUSHYLEAD HOUSE IN CENTER; CHRISTIAN HOUSE AT RIGHT - Sherman-Gilbert House, Heritage Park, San Diego, San Diego County, CA

361

2. DETAIL VIEW OF ANIMAL HOUSE SHOWING NORTHEAST AND SOUTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. DETAIL VIEW OF ANIMAL HOUSE SHOWING NORTHEAST AND SOUTHEAST FACADES AND CONNECTION TO SOUTHEAST FACADE OF STATION GARAGE. VIEW TO WEST. - VA Medical Center, Aspinwall Division, Animal House, 5103 Delafield Avenue, Aspinwall, Allegheny County, PA

362

View of camera station located northeast of Building 70022, facing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of camera station located northeast of Building 70022, facing northwest - Naval Ordnance Test Station Inyokern, Randsburg Wash Facility Target Test Towers, Tower Road, China Lake, Kern County, CA

363

41. Detail, northeast facade, original door from platform to waiting ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

41. Detail, northeast facade, original door from platform to waiting room, now non-functional, view to southwest, 90mm lens; compare with CA-2278-13. - Southern Pacific Depot, 559 El Camino Real, San Carlos, San Mateo County, CA

364

2. BUILDING 321. VIEW TO NORTHEAST. Rocky Mountain Arsenal, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. BUILDING 321. VIEW TO NORTHEAST. - Rocky Mountain Arsenal, Boiler Plant-Central Gas Heat Plant, 1022 feet South of December Seventh Avenue; 525 feet West of D Street, Commerce City, Adams County, CO

365

11. GENERAL VIEW FROM WEST BANK LOOKING NORTHEAST (negative reversed) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. GENERAL VIEW FROM WEST BANK LOOKING NORTHEAST (negative reversed) - American Falls Water, Power & Light Company, Island Power Plant, Snake River, below American Falls Dam, American Falls, Power County, ID

366

1. EXTERIOR SOUTHWEST CORNER VIEW, FACING NORTHEAST. BUILDING NO. 42 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR SOUTHWEST CORNER VIEW, FACING NORTHEAST. BUILDING NO. 42 GARAGE & TRANSPORTATION MAINTENANCE FACILITY - NASA Industrial Plant, Garage & Transportation Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

367

3. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. BUILDING NO 42 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. BUILDING NO 42 GARAGE & TRANSPORTATION MAINTENANCE FACILITY - NASA Industrial Plant, Garage & Transportation Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

368

General exterior view to northeast (Building 203 in background right) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

General exterior view to northeast (Building 203 in background right) - Charlestown Navy Yard, Oxygen Plant, Midway along northern boundary of Charlestown Navy Yard, on Little Mystic Channel, near junction of Eighteenth Street & Fourth Avenue, Boston, Suffolk County, MA

369

10. LOOKING NORTHEAST AT THE LINDE 400 TONS PER DAY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. LOOKING NORTHEAST AT THE LINDE 400 TONS PER DAY LOW PURITY OXYGEN MAKING PLANT IN THE LOW PURITY BULK OXYGEN BUILDING. - U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela River, Duquesne, Allegheny County, PA

370

3. VIEW, LOOKING NORTHEAST, SHOWING A SMALL FIELDSTONE DAM (KNOWN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. VIEW, LOOKING NORTHEAST, SHOWING A SMALL FIELD-STONE DAM (KNOWN LOCALLY AS DAM NO. 2), BUILT BY THE CCC - J. Clark Salyer National Wildlife Refuge Dams, Along Lower Souris River, Kramer, Bottineau County, ND

371

2. VIEW OF POND B, LOOKING NORTHEAST FROM THE WEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW OF POND B, LOOKING NORTHEAST FROM THE WEST SIDE OF THE SOURIS RIVER VALLEY, DUE SOUTH OF THE LOOKOUT TOWER - Upper Souris National Wildlife Refuge Dams, Souris River Basin, Foxholm, Ward County, ND

372

9. CLIFTON HILL, LOOKING NORTHEAST ACROSS STREAM FROM HAZEL WALK ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. CLIFTON HILL, LOOKING NORTHEAST ACROSS STREAM FROM HAZEL WALK Photocopy of photograph, 1930s National Park Service, National Capital Region files - Dumbarton Oaks Park, Thirty-second & R Streets Northwest, Washington, District of Columbia, DC

373

24. HISTORIC VIEW OF STATION AND DOWNTOWN TACOMA LOOKING NORTHEAST, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

24. HISTORIC VIEW OF STATION AND DOWNTOWN TACOMA LOOKING NORTHEAST, 1922 (Boland Collection, Tacoma Public Library Northwest Collection) - Union Passenger Station Concourse, 1713 Pacific Avenue, Tacoma, Pierce County, WA

374

2. PERSPECTIVE VIEW OF SOUTH AND WEST SIDES, LOOKING NORTHEAST, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. PERSPECTIVE VIEW OF SOUTH AND WEST SIDES, LOOKING NORTHEAST, NOTE THE OPEN PANEL IN THE SIDING THAT ALLOW FOR VENTILATION OF THE DRYING TOBACCO - The Cottage, Tobacco Barn, Upper Marlboro, Prince George's County, MD

375

17. MIDBASEMENT, LOOKING NORTHEAST AT WEST END OF THE CONDENSATE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. MID-BASEMENT, LOOKING NORTHEAST AT WEST END OF THE CONDENSATE UNIT FOR TURBINE #4 - Portland General Electric Company, Turbine Building, 1841 Southeast Water Street, Portland, Multnomah County, OR

376

2. Keeper's house and light tower, view southwest, northeast and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. Keeper's house and light tower, view southwest, northeast and northwest sides - Pumpkin Island Light Station, Pumpkin Island, at northern end of Eggemoggin Beach, off northwest end of Little Deer Island, Eggemoggin, Hancock County, ME

377

4. Light tower and keeper's house, view northeast, southwest side ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Light tower and keeper's house, view northeast, southwest side - Pumpkin Island Light Station, Pumpkin Island, at northern end of Eggemoggin Beach, off northwest end of Little Deer Island, Eggemoggin, Hancock County, ME

378

3. Keeper's house, view northwest, southeast and northeast sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Keeper's house, view northwest, southeast and northeast sides - Pumpkin Island Light Station, Pumpkin Island, at northern end of Eggemoggin Beach, off northwest end of Little Deer Island, Eggemoggin, Hancock County, ME

379

2. VIEW SOUTH SHOWING NORTHEAST ELEVATION; BRICK CORBELLING, BUTTRESSES AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW SOUTH SHOWING NORTHEAST ELEVATION; BRICK CORBELLING, BUTTRESSES AND ART DECO STAINED GLASS - Poletown Historic District, St. Michael's Greek Catholic Church, 2390 East Grand Boulevard, Detroit, Wayne County, MI

380

PAINT SHOP, FIRST FLOOR, NORTHEAST CORNER OFFICE INTERIOR, LOOKING WEST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

PAINT SHOP, FIRST FLOOR, NORTHEAST CORNER OFFICE INTERIOR, LOOKING WEST. PROJECTING WALLS WITH INFILLED ARCHES WERE PART OF ONE PAINTING BOOTH IN ORIGINAL STRUCTURE. - Southern Pacific, Sacramento Shops, Paint Shop, 111 I Street, Sacramento, Sacramento County, CA

381

Credit BG. View looks northeast (48°) over concrete foundation for ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Credit BG. View looks northeast (48°) over concrete foundation for Utility and Paint Shop (Building 4315). Four North Base hangars appear in background - Edwards Air Force Base, North Base, Utility & Paint Shop, Second & E Streets, Boron, Kern County, CA

382

10. Cape Elizabeth Light Tower and keeper's house, view northeast, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. Cape Elizabeth Light Tower and keeper's house, view northeast, southwest and southeast sides - Cape Elizabeth Light Station, Near Two Lights State Park at end of Two Lights Road, off State Highway 77, Cape Elizabeth, Cumberland County, ME

383

2. Former light tower, view southwest, northeast and northwest sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. Former light tower, view southwest, northeast and northwest sides (modern house on left) - Cape Elizabeth Light Station, Near Two Lights State Park at end of Two Lights Road, off State Highway 77, Cape Elizabeth, Cumberland County, ME

384

7. Cape Elizabeth Light Tower, detail of lantern, looking northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. Cape Elizabeth Light Tower, detail of lantern, looking northeast - Cape Elizabeth Light Station, Near Two Lights State Park at end of Two Lights Road, off State Highway 77, Cape Elizabeth, Cumberland County, ME

385

9. Keeper's house, view west, northeast and southeast sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Keeper's house, view west, northeast and southeast sides - Cape Elizabeth Light Station, Near Two Lights State Park at end of Two Lights Road, off State Highway 77, Cape Elizabeth, Cumberland County, ME

386

5. Cape Elizabeth Light Tower, view southwest, northeast side ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Cape Elizabeth Light Tower, view southwest, northeast side - Cape Elizabeth Light Station, Near Two Lights State Park at end of Two Lights Road, off State Highway 77, Cape Elizabeth, Cumberland County, ME

387

20. GENERAL VIEW OF CONSTRUCTION LOOKING NORTHEAST SHOWING THE CONSTRUCTION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

20. GENERAL VIEW OF CONSTRUCTION LOOKING NORTHEAST SHOWING THE CONSTRUCTION BRIDGE, GANTRY CRANE AND STRUCTURAL PIERS. - Wilson Dam & Hydroelectric Plant, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

388

18. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FISH LADDER ON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FISH LADDER ON BRADFORD ISLAND; DAM/SPILLWAY IS VISIBLE IN CENTER BACKGROUND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

389

6. VIEW LOOKING NORTH TO NORTHEAST OF DENNIS HOTEL, BLENHEIM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. VIEW LOOKING NORTH TO NORTHEAST OF DENNIS HOTEL, BLENHEIM HOTEL AND MARLBOROUGH HOTEL (LEFT TO RIGHT) IN THE CENTER OF THE PHOTO - Marlborough, Blenheim & Dennis Hotels (aerial views), Between Park Place, Michigan Avenue & Boardwalk, Atlantic City, Atlantic County, NJ

390

54. VIEW LOOKING NORTHEAST AT DENNIS HOTEL, BLENHEIM HOTEL AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

54. VIEW LOOKING NORTHEAST AT DENNIS HOTEL, BLENHEIM HOTEL AND MARLBOROUGH HOTEL (LEFT TO RIGHT) - Marlborough, Blenheim & Dennis Hotels (aerial views), Between Park Place, Michigan Avenue & Boardwalk, Atlantic City, Atlantic County, NJ

391

3. Southwest side of quarters (executive officer's quarters), looking northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Southwest side of quarters (executive officer's quarters), looking northeast - Naval Air Station Chase Field, Quarters S, Essex Street, .45 mile South-Southeast of intersection of Texas State Highway 202 & Independence Street, Beeville, Bee County, TX

392

1. Northeast side of Building 1042 (brig), looking southwest ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. Northeast side of Building 1042 (brig), looking southwest - Naval Air Station Chase Field, Building 1042, Ofstie Road, .6 mile South-Southeast of intersection of Texas State Highway 202 & Independence Street, Beeville, Bee County, TX

393

4. Northeast side of Building 1009, (enlisted waves' barracks), looking ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Northeast side of Building 1009, (enlisted waves' barracks), looking southwest - Naval Air Station Chase Field, Building 1009, Essex Street, .68 mile South-southeast of intersection of Texas State Highway 202 & Independence Street, Beeville, Bee County, TX

394

4. Northeast side of Building 1015 (land plane hangar), looking ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. Northeast side of Building 1015 (land plane hangar), looking southwest - Naval Air Station Chase Field, Building 1015, Byrd Street, .82 mile South-southeast of intersection of Texas State Highway 202 & Independence Street, Beeville, Bee County, TX

395

8. Southwest side of Building 1040 (chapel), looking northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. Southwest side of Building 1040 (chapel), looking northeast - Naval Air Station Chase Field, Building 1040, Enterprise Street, .37 mile South-Southeast of intersection of Texas State Highway 202 & Independence Street, Beeville, Bee County, TX

396

8. Overview of site, looking northeast Naval Air Station ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. Overview of site, looking northeast - Naval Air Station Chase Field, Building 1001, Independence Street, .45 mile south of intersection of Texas State Highway & Independence Street, Beeville, Bee County, TX

397

13. Second floor, northeast chamber, south wall. Closet to left; ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. Second floor, northeast chamber, south wall. Closet to left; bath to right. Stairs to attic are above shelves in the bath. - Conner Homestead, House, Epping Road (State Route 101), Exeter, Rockingham County, NH

398

1. GENERAL VIEW TOWARD NORTHEAST, WEST AND SOUTH FACADES East ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. GENERAL VIEW TOWARD NORTHEAST, WEST AND SOUTH FACADES East facade immediately adjoined by steep hill. North facade obscured by conifers. - U.S. Military Academy, Ice House, Mills Road at Howze Place, West Point, Orange County, NY

399

VIEW LOOKING NORTHEAST SHOWING A CORNER DETAIL OF THE POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW LOOKING NORTHEAST SHOWING A CORNER DETAIL OF THE POWERHOUSE AND THE SOUTHERN SECTION OF THE DAM. - Wilson Dam & Hydroelectric Plant, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

400

VIEW NORTHEAST, WEST FRONT OF PACKING SHED (BUILDING 20) AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW NORTHEAST, WEST FRONT OF PACKING SHED (BUILDING 20) AND BAMBOO STAND ALONG SOUTH FRONT - U.S. Plant Introduction Station, Packing Shed, 11601 Old Pond Road, Glenn Dale, Prince George's County, MD

401

86. Mezzanine level looking northeast showing connection between northwest leg ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

86. Mezzanine level looking northeast showing connection between northwest leg of central pylon and main anchorage beam; up-flight of helical stair at right. February 1984. - Statue of Liberty, Liberty Island, Manhattan, New York, New York County, NY

402

Oblique detail of northeast end of facility 226, showing raised ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Oblique detail of northeast end of facility 226, showing raised foundation, roof vents and eaves. - U.S. Naval Base, Pearl Harbor, Storehouse for Defense Battalion Type, Between Port Royal Street & Fuller Way, Pearl City, Honolulu County, HI

403

3. INTERIOR VIEW OF BUILDING NO. 1 FACING NORTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. INTERIOR VIEW OF BUILDING NO. 1 FACING NORTHEAST. - U.S. Naval Base, Pearl Harbor, Ordinance Operations Building, West Loch, First Street near Whiskey Wharves W1 & W2, Pearl City, Honolulu County, HI

404

View facing northeast of Structure 1034, last numbered structure on ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View facing northeast of Structure 103-4, last numbered structure on northern (Havre) end of Transmission Line - Havre Rainbow Transmission Line, Havre City to Great Falls vicinity, Montana, Great Falls, Cascade County, MT

405

4. View of Clark Fork Vehicle Bridge facing northeast. Bridge ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. View of Clark Fork Vehicle Bridge facing northeast. Bridge from south shoreof Clark Fork River showing 4 spans. - Clark Fork Vehicle Bridge, Spanning Clark Fork River, serves Highway 200, Clark Fork, Bonner County, ID

406

2. View of Clark Fork Vehicle Bridge facing northeast. Bridge ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. View of Clark Fork Vehicle Bridge facing northeast. Bridge from south shore of Clark Fork River showing 4 1/2 spans. - Clark Fork Vehicle Bridge, Spanning Clark Fork River, serves Highway 200, Clark Fork, Bonner County, ID

407

SULPHITE BRIDGE FROM DOWNSTREAM, BEARING NORTHEAST 25 DEGREES. THE BRIDGE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

SULPHITE BRIDGE FROM DOWNSTREAM, BEARING NORTHEAST 25 DEGREES. THE BRIDGE ONCE HAD VERTICAL BOARD SIDING BUT VANDALS BURNED IT OFF IN 1981 - Sulphite Railroad Bridge, Former Boston & Maine Railroad (originally Tilton & Franklin Railroad) spanning Winnipesautee River, Franklin, Merrimack County, NH

408

Looking Northeast at Southwest End of Maintenance Shop with Milling ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Looking Northeast at Southwest End of Maintenance Shop with Milling Machines, Hoist, Electrical Boxes in Recycle Recovery Building - Hematite Fuel Fabrication Facility, Recycle Recovery Building, 3300 State Road P, Festus, Jefferson County, MO

409

44. NORTHEAST VIEW OF IRON DESULPHERIZATION BUILDING, WITH CALCIUM CARBIDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

44. NORTHEAST VIEW OF IRON DESULPHERIZATION BUILDING, WITH CALCIUM CARBIDE SILO ADJACENT TO BUILDING ON RIGHT. (Jet Lowe) - U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela River, Duquesne, Allegheny County, PA

410

2. View looking northeast at Dixie Cotton Mill warehouses. Note ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. View looking northeast at Dixie Cotton Mill warehouses. Note firestops between sections of the building to prevent fire from spreading. - Dixie Cotton Mill, Warehouses, 710 Greenville Street, La Grange, Troup County, GA

411

3. View from northeast corner, Canisteo and Spruce Streets. Photo ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. View from northeast corner, Canisteo and Spruce Streets. Photo shows the garage area (Building #5) with sawtooth roofline and front elevation of Buildings #6 and #1. - Merrill Silk Mill, 233 Canisteo Street, Hornell, Steuben County, NY

412

5. Northeast corner office on third floor where Ford worked ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Northeast corner office on third floor where Ford worked with others on automobile design that resulted in model T Fords. - Ford Piquette Plant, Corner of Piquette Avenue & Beaubien, Detroit, Wayne County, MI

413

12. LAMP MECHANISM WEIGHT PIT, WITH SCALE, LOOKING NORTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. LAMP MECHANISM WEIGHT PIT, WITH SCALE, LOOKING NORTHEAST - Hunting Island Lighthouse, Lighthouse, Hunting Island State Park, U.S. Route 21, 16 miles East of Beaufort, Beaufort, Beaufort County, SC

414

1. COTTAGE 'HI 64', SOUTHEAST (FRONT) AND NORTHEAST SIDE ELEVATIONS, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. COTTAGE 'HI 64', SOUTHEAST (FRONT) AND NORTHEAST SIDE ELEVATIONS, LOOKING WEST - Hunting Island Lighthouse, Cottage HI-64, Hunting Island State Park, US Route 21, 16 miles East of Beaufort, Beaufort, Beaufort County, SC

415

44. PIAZZA, SECOND FLOOR, LOOKING NORTHEAST. AT LEFT IS ORIGINAL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

44. PIAZZA, SECOND FLOOR, LOOKING NORTHEAST. AT LEFT IS ORIGINAL FOLDING DOOR. AT RIGHT IS ORIGINAL WINDOW (FRAME AND SASH) - Kid-Chandler House, 323 Walnut Street, Philadelphia, Philadelphia County, PA

416

8. RAIL SPURS AND NORTHEAST PART OF EAST ELEVATION. VIEW ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. RAIL SPURS AND NORTHEAST PART OF EAST ELEVATION. VIEW TO NORTH-NORTHWEST. - Ford Motor Company Long Beach Assembly Plant, Assembly Building, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

417

9. REINFORCED CONCRETE SLAB ROOF FROM NORTHEAST EDGE, VIEW TOWARDS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. REINFORCED CONCRETE SLAB ROOF FROM NORTHEAST EDGE, VIEW TOWARDS SOUTHWEST. - Glenn L. Martin Company, Titan Missile Test Facilities, Captive Test Stand D-4, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

418

6. SOUTH END OF TAN 629 HANGAR, FACING NORTHEAST. DETAIL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. SOUTH END OF TAN 629 HANGAR, FACING NORTHEAST. DETAIL OF HANGAR DOOR, EMPENNAGE DOOR, DOOR PATCHES. - Idaho National Engineering Laboratory, Test Area North, Hangar No. 629, Scoville, Butte County, ID

419

3. CONTEXTUAL VIEW OF NORTHEAST CORNER OF TAN 629 HANGAR, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. CONTEXTUAL VIEW OF NORTHEAST CORNER OF TAN 629 HANGAR, TAKEN FROM OUTSIDE FENCE, FACING SOUTHWEST. - Idaho National Engineering Laboratory, Test Area North, Hangar No. 629, Scoville, Butte County, ID

420

9. LOOKING EAST NORTHEAST, CANAL STREET BRIDGE IN FOREGROUND, PENNSYLVANIA ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. LOOKING EAST NORTHEAST, CANAL STREET BRIDGE IN FOREGROUND, PENNSYLVANIA RAILROAD BRIDGE IN MIDGROUND. - Pennsylvania Railroad, South Branch Chicago River Bridge, Spanning South Branch of Chicago River Bridge east of Canal Street, Chicago, Cook County, IL

421

8. LOOKING NORTHEAST TOWARD LOOP, PENNSYLVANIA RAILROAD BRIDGE IN BOTTOM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. LOOKING NORTHEAST TOWARD LOOP, PENNSYLVANIA RAILROAD BRIDGE IN BOTTOM CENTER OF FRAME. - Pennsylvania Railroad, South Branch Chicago River Bridge, Spanning South Branch of Chicago River Bridge east of Canal Street, Chicago, Cook County, IL

422

2. VIEW OF NORTHWEST SIDE SHOWING NORTHEAST (GABLE END) FRONT. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW OF NORTHWEST SIDE SHOWING NORTHEAST (GABLE END) FRONT. (BUILDING 114 IS VISIBLE ON RIGHT.) - Fort McPherson, World War II Station Hospital, G. U. Treatment Unit Dispensary, Thorne Avenue, Atlanta, Fulton County, GA

423

Sculpture, cast iron lamps at northeast corner of Stephen Sitter ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Sculpture, cast iron lamps at northeast corner of Stephen Sitter Avenue and Forney road, with scale - National Park Seminary, Bounded by Capitol Beltway (I-495), Linden Lane, Woodstove Avenue, & Smith Drive, Silver Spring, Montgomery County, MD

424

82. FIRST AND SECOND AQUEDUCTS LOOKING NORTHEAST Los Angeles ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

82. FIRST AND SECOND AQUEDUCTS LOOKING NORTHEAST - Los Angeles Aqueduct, From Lee Vining Intake (Mammoth Lakes) to Van Norman Reservoir Complex (San Fernando Valley), Los Angeles, Los Angeles County, CA

425

8. NORTHEAST CORNER OF ORIGINAL MILL WITH SMALL ADDITIONS AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. NORTHEAST CORNER OF ORIGINAL MILL WITH SMALL ADDITIONS AND OUTBUILDINGS. NOTE ORIGINAL DUST CHIMNEY ON RIGHT AND WATER TOWER ON LEFT. - Selma Cotton Mill, 218 Morgan Avenue, Selma, Dallas County, AL

426

Feasibility Study - Industrial Park in Northeast Oklahoma City.  

National Technical Information Service (NTIS)

The report studies the feasibility of establishing an industrial park in the northeast sector of Oklahoma City, with respect to its geographic location, accessibility, size, the community characteristics and the available infrastructure. The analysis pres...

1975-01-01

427

110. Detail of turbine unit no. 2, looking northeast. Photo ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

110. Detail of turbine unit no. 2, looking northeast. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

428

10. VIEW LOOKING NORTHEAST, COLUMN SUPPORTS, HOPPER CHUTES AND CONCRETE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. VIEW LOOKING NORTHEAST, COLUMN SUPPORTS, HOPPER CHUTES AND CONCRETE SUPPORT LIPS, AND CONVEYOR DRIVE SHAFT ON SUBDECK - West Shore Railroad, Pier 7 Grain Elevator, Hudson River & Pershing Road vicinity, West New York, Hudson County, NJ

429

100. MISSILE ORDNANCE TEST FIXTURE (FLEMING UNIT) ON NORTHEAST WALL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

100. MISSILE ORDNANCE TEST FIXTURE (FLEMING UNIT) ON NORTHEAST WALL OF LANDLINE INSTRUMENTATION ROOM (106), LSB (BLDG. 770) - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

430

Interior, looking northeast Beale Air Force Base, Perimeter Acquisition ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior, looking northeast - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Clean Lubrication Oil Storage Tank & Enclosure, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

431

2. General view to northeast along Barton Avenue showing central ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. General view to northeast along Barton Avenue showing central courtyard and rotunda of hospital - Portsmouth Naval Hospital, Hospital Building, Rixey Place, bounded by Williamson Drive, Holcomb Road, & The Circle, Portsmouth, Portsmouth, VA

432

3. MAIN HOSPITAL, VIEW OF EAST SIDE AND NORTHEAST CORNER. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. MAIN HOSPITAL, VIEW OF EAST SIDE AND NORTHEAST CORNER. - Presidio of San Francisco, Letterman General Hospital, Building No. 27, Letterman Hospital Complex, Edie Road, San Francisco, San Francisco County, CA

433

2. PERSPECTIVE VIEW OF OVENS ALONG CATS RUN LOOKING NORTHEAST, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. PERSPECTIVE VIEW OF OVENS ALONG CATS RUN LOOKING NORTHEAST, SHOWING OVEN NOS. 159 (RIGHT) THROUGH 163 (LEFT) - Griffin No. 1 Coke Works, Along Cats Run, Southeast of Masontown Bourough (Nicholson Township), Masontown, Fayette County, PA

434

Detail showing connection of trusses to counter weights. View northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail showing connection of trusses to counter weights. View northeast - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

435

Detail of remnants of downstream fender pier system. View northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail of remnants of downstream fender pier system. View northeast - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

436

4. GENERAL VIEW LOOKING NORTHEAST. SOUTH STATION VISIBLE IN BACKGROUND. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. GENERAL VIEW LOOKING NORTHEAST. SOUTH STATION VISIBLE IN BACKGROUND. - New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Lift Bridge, Spanning Fort Point Channel, Boston, Suffolk County, MA

437

GENERAL VIEW FROM NORTHWEST SHOWING NORTHEAST FRONT OF HOUSE AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL VIEW FROM NORTHWEST SHOWING NORTHEAST FRONT OF HOUSE AND STONE RETAINING WALL ALONG OLD SAINT MARY'S ROAD - Nicolas Janis House, 244 Old St. Mary's Road, Sainte Genevieve, Ste. Genevieve County, MO

438

GENERAL VIEW FROM NORTHWEST SHOWING NORTHEAST FRONT OF HOUSE AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL VIEW FROM NORTHWEST SHOWING NORTHEAST FRONT OF HOUSE AND STONE RETAINING WALL ALONG OLD ST. MARY'S ROAD - Nicolas Janis House, 244 Old St. Mary's Road, Sainte Genevieve, Ste. Genevieve County, MO

439

31. LOOKING NORTHEAST AT CONSTRUCTION ACTIVITIES ON GLENN CURTIS DRIVE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

31. LOOKING NORTHEAST AT CONSTRUCTION ACTIVITIES ON GLENN CURTIS DRIVE IN OFFICERS QUARTERS. USN PHOTO, APRIL 25, 1941. - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

440

View towards the northeast of coffee beans drying on the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View towards the northeast of coffee beans drying on the third floor with hopper and drum type dryer in background - Santaella Coffee Processing Site, Highway 139, Kilometer 10.6, Maraguez, Ponce Municipio, PR

441

2. General view of Morrison Bridge, looking northeast, with Tom ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. General view of Morrison Bridge, looking northeast, with Tom McCall Riverfront Park in foreground. - Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets, Portland, Multnomah County, OR

442

1. EXTERIOR VIEW, LOOKING NORTH NORTHEAST ALONG EASTERN VALLEY ROAD, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, LOOKING NORTH NORTHEAST ALONG EASTERN VALLEY ROAD, WITH FRONT AND SIDE (WEST) ELEVATIONS AND REAR ADDITIONS - Thomas H. Owen House, Eastern Valley Road West of State Road 150, McCalla, Jefferson County, AL

443

Perspective view looking from the northeast, from approximately the same ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Perspective view looking from the northeast, from approximately the same vantage point as in MD-1109-K-12 - National Park Seminary, Japanese Bungalow, 2801 Linden Lane, Silver Spring, Montgomery County, MD

444

Detail view of east northeast elevation to show steps and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail view of east northeast elevation to show steps and lanterns; note causeway to Swiss Chalet in background - National Park Seminary, Japanese Pagoda, 2805 Linden Lane, Silver Spring, Montgomery County, MD

445

Perspective view looking from the east to the east northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Perspective view looking from the east to the east northeast facade, with Swiss Chalet in background, to replicate the view shown in MD-1109-J-18 - National Park Seminary, Japanese Pagoda, 2805 Linden Lane, Silver Spring, Montgomery County, MD

446

10. NORTHEAST CORNER CONSTRUCTION DETAIL, VIEW OF SIDEWALK. TAMARACK BRIDGE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. NORTHEAST CORNER CONSTRUCTION DETAIL, VIEW OF SIDEWALK. TAMARACK BRIDGE IN LEFT REAR. - Cascade Creek Bridge, Spanning Cascade Creek on New Big Oak Flat Road, Yosemite Village, Mariposa County, CA

447

9. EXTERIOR PERSPECTIVE OF POWER PLANT BUILDING LOOKING NORTHEAST. DRY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. EXTERIOR PERSPECTIVE OF POWER PLANT BUILDING LOOKING NORTHEAST. DRY CANAL BED IN FOREGROUND. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

448

71. INTERIOR, BUILDING 272 (PLUTONIUM STORAGE BUILDING) LOOKING NORTHEAST INTO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

71. INTERIOR, BUILDING 272 (PLUTONIUM STORAGE BUILDING) LOOKING NORTHEAST INTO PLUTONIUM STORAGE ROOM SHOWING CUBICLES FOR STORAGE. - Loring Air Force Base, Weapons Storage Area, Northeastern corner of base at northern end of Maine Road, Limestone, Aroostook County, ME

449

NORTHEAST (REAR) AND SOUTHEAST (SIDE) ELEVATIONS OF BUILDING. view TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

NORTHEAST (REAR) AND SOUTHEAST (SIDE) ELEVATIONS OF BUILDING. view TO WEST - Plattsburgh Air Force Base, Demineralized Water Storage Building, Off LeMay Road, outside SAC Alert Area, Plattsburgh, Clinton County, NY

450

NORTHEAST (REAR) AND NORTHWEST (SIDE) ELEVATIONS OF BUILDING. VIEW TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

NORTHEAST (REAR) AND NORTHWEST (SIDE) ELEVATIONS OF BUILDING. VIEW TO SOUTH - Plattsburgh Air Force Base, Demineralized Water Storage Building, Off LeMay Road, outside SAC Alert Area, Plattsburgh, Clinton County, NY

451

145. WOOD SHOP, LOOKING NORTHEAST AT GRUBER BUILT BAND SAW ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

145. WOOD SHOP, LOOKING NORTHEAST AT GRUBER BUILT BAND SAW AND POT BELLIED STOVE (NOT IN ORIGINAL LOCATION). - Gruber Wagon Works, Pennsylvania Route 183 & State Hill Road at Red Bridge Park, Bernville, Berks County, PA

452

11. View toward southwest, northeast oblique of perimeter acquisition radar ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. View toward southwest, northeast oblique of perimeter acquisition radar building showing - Stanley R. Mickelsen Safeguard Complex, Perimeter Acquisition Radar Building, Limited Access Area, between Limited Access Patrol Road & Service Road A, Nekoma, Cavalier County, ND

453

View of Face B Array, looking northeast Beale Air ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of Face B Array, looking northeast - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Techinical Equipment Building, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

454

16. INTERIOR VIEW TO THE NORTHEAST OF ROOM 107, THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. INTERIOR VIEW TO THE NORTHEAST OF ROOM 107, THE HOT STORAGE AND PACKAGING ROOM. - Nevada Test Site, Pluto Facility, Disassembly Building, Area 26, Wahmonie Flats, Cane Spring Road, Mercury, Nye County, NV

455

Exterior overall oblique view of the northeast and southeast sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior overall oblique view of the northeast and southeast sides - U.S. Naval Base, Pearl Harbor, Scrap Metal Packaging Facility, Seventh Street between Facility Nos. 6 & 247, Pearl City, Honolulu County, HI

456

6. View northeast, junction of SR 141 and Rockland Road, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. View northeast, junction of SR 141 and Rockland Road, western estate wall and tree lines to right - A. I. Du Pont Estate, Junction of State Route 141 & Rockland Road, Wilmington, New Castle County, DE

457

4. VIEW SHOWING UPSTREAM FACE OF DAM, LOOKING NORTHEAST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. VIEW SHOWING UPSTREAM FACE OF DAM, LOOKING NORTHEAST - High Mountain Dams in Upalco Unit, Kidney Lake Dam, Ashley National Forest, 4.7 miles North of Miners Gulch Campground, Mountain Home, Duchesne County, UT

458

4. View of center tower at Clover Island, facing northeast. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. View of center tower at Clover Island, facing northeast. Pasco-Kennewick automobile bridge in background, lower right. - Pasco-Kennewick Transmission Line, Columbia River Crossing Towers, Columbia Drive & Gum Street, Kennewick, Benton County, WA

459

8. PERSPECTIVE VIEW FROM THE NORTHEAST SHOWING THE EAST ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. PERSPECTIVE VIEW FROM THE NORTHEAST SHOWING THE EAST ELEVATION & COAL TOWER No. 2 AND THE NORTH ELEVATION (SWITCH HOUSE EXTERIOR) - Delaware County Electric Company, Chester Station, Delaware River at South end of Ward Street, Chester, Delaware County, PA

460

118. VIEW OF NORTH ELEVATION FROM THE NORTHEAST (DUPLICATE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

118. VIEW OF NORTH ELEVATION FROM THE NORTHEAST (DUPLICATE OF HAER NO. PA-505-9) - Delaware County Electric Company, Chester Station, Delaware River at South end of Ward Street, Chester, Delaware County, PA

461

Geologic Study of Kettle Dome, Northeast Washington. Final Report.  

National Technical Information Service (NTIS)

This geologic study of Kettle dome, northeast Washington, encompasses an area of approximately 800 square miles (2048 sq km). The evaluation of uranium occurrences associated with the igneous and metamorphic rocks of the dome and the determination of the ...

1980-01-01

462

17. VIEW OF THE DIAMOND MINEYARD LOOKING NORTHEAST. THE DRIES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. VIEW OF THE DIAMOND MINEYARD LOOKING NORTHEAST. THE DRIES ARE ON THE LEFT, WITH THE TAR HOUSE, TOILET, AND ROPE CLAMP CLEANING BUILDING TO THE RIGHT - Butte Mineyards, Diamond Mine, Butte, Silver Bow County, MT

463

DETAIL OF NORTHEAST CUT STONE ABUTMENT FROM SOUTHWEST. Cataract ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

DETAIL OF NORTHEAST CUT STONE ABUTMENT FROM SOUTHWEST. - Cataract Falls Bridge, Spanning Mill Creek, bypassed section of CR 279 (Cataract Falls Unit of Leiber State Recreation Area), Cataract, Owen County, IN

464

View northeast; detail of southwest corner showing damage to façade ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View northeast; detail of southwest corner showing damage to façade - Naval Base Philadelphia-Philadelphia Naval Shipyard, Foundry-Propeller Shop, North of Porter Avenue, west of Third Street West, Philadelphia, Philadelphia County, PA

465

5. Overview of bay with geared mechanism to northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Overview of bay with geared mechanism to northeast - Mississippi River 9-Foot Channel, Lock & Dam No. 1, In Mississippi River at Mississippi Boulevard, below Ford Parkway Bridge, Saint Paul, Ramsey County, MN

466

3. VIEW NORTHEAST, SOUTH FRONT OF SOIL CONSERVATION SERVICE CLUSTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. VIEW NORTHEAST, SOUTH FRONT OF SOIL CONSERVATION SERVICE CLUSTER (BUILDING 25) - U.S. Plant Introduction Station, Soil Conservation Service Cluster, 11601 Old Pond Road, Glenn Dale, Prince George's County, MD

467

1. OVERALL VIEW OF MILK LAKE, LOOKING NORTHEAST High ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. OVERALL VIEW OF MILK LAKE, LOOKING NORTHEAST - High Mountain Dams in Upalco Unit, Milk Lake Dam, Ashley National Forest, 9.4 miles Northwest of Swift Creek Campground, Mountain Home, Duchesne County, UT

468

6. DETAIL VIEW OF NORTHEAST END OF BRIDGE, SHOWING ROCKER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. DETAIL VIEW OF NORTHEAST END OF BRIDGE, SHOWING ROCKER ARM PORTION OF BASCULE - Seddon Island Scherzer Rolling Lift Bridge, Spanning Garrison Channel from Tampa to Sedden Island, Tampa, Hillsborough County, FL

469

18. VIEW NORTHEAST, SHAFT, CAM, AND OPERATING ARM FOR NORTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. VIEW NORTHEAST, SHAFT, CAM, AND OPERATING ARM FOR NORTH END LOCK, INBOARD SIDE OF WEST BASCULE GIRDER - Grand Street Bridge, Spanning Pequonnock River at Grand Street, Bridgeport, Fairfield County, CT

470

13. VIEW NORTHEAST, BUILDING 12 INTERIOR, WIND TUNNEL FAN ASSEMBLY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. VIEW NORTHEAST, BUILDING 12 INTERIOR, WIND TUNNEL FAN ASSEMBLY - Naval Surface Warfare Center, Transonic Wind Tunnel Building, Bounded by Clara Barton Parkway & McArthur Boulevard, Silver Spring, Montgomery County, MD

471

1. VIEW NORTHEAST, LEFT TO RIGHT COLD CALIBRATION TEST STAND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW NORTHEAST, LEFT TO RIGHT COLD CALIBRATION TEST STAND COLD CALIBRATION BLOCKHOUSE IN FOREGROUND. - Marshall Space Flight Center, East Test Area, Cold Calibration Test Stand, Huntsville, Madison County, AL

472

19. PHOTOCOPY OF c. 1920 VIEW LOOKING NORTHEAST. COURTESY OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. PHOTOCOPY OF c. 1920 VIEW LOOKING NORTHEAST. COURTESY OF GWENDOLYN G. de CLAIRVILLE, HUNTINGTON, WEST VIRGINIA 11743 - Lefferts Tide Mill, Huntington Harbor, Southdown Road, Huntington, Suffolk County, NY

473

7 CFR 1001.2 - Northeast marketing area.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 2012-01-01 false Northeast marketing area. 1001.2 Section 1001.2 Agriculture...Department of Agriculture (Continued) AGRICULTURAL MARKETING SERVICE (Marketing Agreements and Orders; Milk), DEPARTMENT...

2012-01-01

474

5. Division Gates of the Consolidated Canal, looking northeast. The ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Division Gates of the Consolidated Canal, looking northeast. The Tempe Canal heads here (left). Photographer: Mark Durben, February 1989. Source: SRPA - Tempe Canal, South Side Salt River in Tempe, Mesa & Phoenix, Tempe, Maricopa County, AZ

475

1. EXTERIOR VIEW, OBLIQUE PERSPECTIVE, LOOKING NORTHEAST, WITH SIDE AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, OBLIQUE PERSPECTIVE, LOOKING NORTHEAST, WITH SIDE AND FRONT ELEVATIONS OF THE CHURCH AND THE GAZEBO BAND STAND (LEFT) - St. Mark's Catholic Church, 1040 Tenth Avenue West, Thomas, Jefferson County, AL

476

INTERIOR TOWER ROOM LOOKING NORTHEAST. Oregon Inlet Coast Guard ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

INTERIOR TOWER ROOM LOOKING NORTHEAST. - Oregon Inlet Coast Guard Station, Northern end of Pea Island, East side of State Road 1257, 0.3 mile North of North Carolina Highway 12, Rodanthe, Dare County, NC

477

3. AERIAL VIEW LOOKING NORTHEAST, SHOWING ERECTING SHOP, MILLWRIGHT SHOP, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. AERIAL VIEW LOOKING NORTHEAST, SHOWING ERECTING SHOP, MILLWRIGHT SHOP, AND FITTING SHOP. UPPER RACE CURVES IN FOREGROUND. - Rogers Locomotive & Machine Works, Spruce & Market Streets, Paterson, Passaic County, NJ

478

6. VIEW SHOWING NORTHEAST END OF WHARF REAR FROM LANDSLIDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. VIEW SHOWING NORTHEAST END OF WHARF REAR FROM LANDSLIDE - U.S. Naval Base, Pearl Harbor, Berthing Wharf S378, Beckoning Point, Southeast of Cowpens Street, Ford Island, Pearl City, Honolulu County, HI

479

Straight on view of northeast side of Olive Switching Station ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Straight on view of northeast side of Olive Switching Station from north side of San Fernando Road facing southwest - Olive Switching Station, 13355 San Fernando Road, Los Angeles, Los Angeles County, CA

480

46. NORTHEAST CORNER OF SECOND FLOOR WAREHOUSE, WITH DETAIL OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

46. NORTHEAST CORNER OF SECOND FLOOR WAREHOUSE, WITH DETAIL OF WOODEN BLOCK FLOORING. VIEW TO NORTH. - Ford Motor Company Long Beach Assembly Plant, Assembly Building, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

481

2. Northeast end and southeast side. View to west. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. Northeast end and southeast side. View to west. - Offutt Air Force Base, Looking Glass Airborne Command Post, Vehicle Refueling Shop, In west corner of Project Looking Glass Historic District, Bellevue, Sarpy County, NE

482

VIEW OF BATCH STORAGE SILOS LOOKING NORTHEAST FROM DREY STREET, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF BATCH STORAGE SILOS LOOKING NORTHEAST FROM DREY STREET, SHOWING RUINS OF BOILER HOUSE WITH SALVAGED MACHINERY IN FOREGROUND - Chambers Window Glass Company, Batch Plant, North of Drey (Nineteenth) Street, West of Constitution Boulevard, Arnold, Westmoreland County, PA

483

10. DETAIL LOOKING SOUTHEAST TOWARD THE NORTHEAST ABUTMENT OF THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. DETAIL LOOKING SOUTHEAST TOWARD THE NORTHEAST ABUTMENT OF THE BRIDGE. THE OUTRIGGERS OF STEEL 'I' SECTIONS AND POLYGONAL PLATE ARE VISIBLE. - Madison County Bridge 90, Spanning Killbuck Creek on County Road No. 600, Moonville, Madison County, IN

484

View of 175 ton hoisthouse from northeast. Hoist operator's cab ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of 175 ton hoist-house from northeast. Hoist operator's cab is in foreground center. - Marshall Space Flight Center, Saturn V Dynamic Test Facility, East Test Area, Huntsville, Madison County, AL

485

6. View northeast and upstream, west end of spillway to ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. View northeast and upstream, west end of spillway to left, east end of spillway and east abutment to right - Sewall's Falls Hydroelectric Facility, East end of Second Street spanning Merrimack River, Concord, Merrimack County, NH

486

7. GROUND FLOOR, NORTHEAST PARLOR, LOOKING TOWARD EAST WALL, VIEW ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. GROUND FLOOR, NORTHEAST PARLOR, LOOKING TOWARD EAST WALL, VIEW SHOWING WOODEN FLOORBOARDS, FIREPLACE AND MANTEL, OVERMANTEL, CORNICE AND PILASTER STRIPS AND FURNISHINGS - Clover Fields, Forman's Lodge Road, Wye Mills, Talbot County, MD

487

1. CHICKEN HOUSE. SOUTH AND WEST FACADES. VIEW TO NORTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. CHICKEN HOUSE. SOUTH AND WEST FACADES. VIEW TO NORTHEAST. - Thompson Falls Hydroelectric Project, Chicken House, On island between Forebay Channel & ClarkFord River, Thompson Falls, Sanders County, MT

488

43. VIEW TO NORTHEAST; MBE BUILDING, THIRD FLOOR, CONDUCTORS' LOCKER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

43. VIEW TO NORTHEAST; MBE BUILDING, THIRD FLOOR, CONDUCTORS' LOCKER ROOM INTERIOR (Dobson) - Los Angeles Union Passenger Terminal, Mail, Baggage, & Express Building, 800 North Alameda Street, Los Angeles, Los Angeles County, CA

489

OBLIQUE VIEW OF NORTHEAST AND SOUTHEAST SIDES OF HYDROELECTRIC POWER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

OBLIQUE VIEW OF NORTHEAST AND SOUTHEAST SIDES OF HYDROELECTRIC POWER HOUSE, VIEW TOWARDS WEST - St. Lucie Canal, Lock No. 1, Hydroelectric Power House, St. Lucie, Cross State Canal, Okeechobee Intracoastal Waterway, Stuart, Martin County, FL

490

OBLIQUE VIEW OF NORTHWEST AND NORTHEAST SIDES OF HYDROELECTRIC POWER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

OBLIQUE VIEW OF NORTHWEST AND NORTHEAST SIDES OF HYDROELECTRIC POWER HOUSE, OLD BYPASS IN BACKGROUND, VIEW TOWARDS SOUTH - St. Lucie Canal, Lock No. 1, Hydroelectric Power House, St. Lucie, Cross State Canal, Okeechobee Intracoastal Waterway, Stuart, Martin County, FL

491

GENERAL VIEW LOOKING NORTHEAST SHOWING THE SWITCHYARD OF THE WILSON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GENERAL VIEW LOOKING NORTHEAST SHOWING THE SWITCHYARD OF THE WILSON DAM HYDROELECTRIC GENERATING PLANT. - Wilson Dam & Hydroelectric Plant, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

492

2. NORTHEAST CORNER OF LARD REFINERY (CONNECTING BUILDING ON THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. NORTHEAST CORNER OF LARD REFINERY (CONNECTING BUILDING ON THE RIGHT) - Wilson's Oil House, Lard Refinery, & Edible Fats Factory, Lard Refinery, 2801 Southwest Fifteenth Street, Oklahoma City, Oklahoma County, OK

493

3. VIEW TO SOUTHWEST (NORTHEAST CORNER OF EDIBLE FATS FACTORY) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. VIEW TO SOUTHWEST (NORTHEAST CORNER OF EDIBLE FATS FACTORY) - Wilson's Oil House, Lard Refinery, & Edible Fats Factory, Edible Fats Factory, 2801 Southwest Fifteenth Street, Oklahoma City, Oklahoma County, OK

494

2. OBLIQUE VIEW TO NORTHEAST ALONG FRONT OF SANTA ANA ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. OBLIQUE VIEW TO NORTHEAST ALONG FRONT OF SANTA ANA RIVER DIVERSION DAM. NOTE CABLE CAR SUSPENSION CABLE AT GATE ATOP DAM. - Santa Ana River Hydroelectric System, Santa Ana River Diversion Dam, Redlands, San Bernardino County, CA

495

1. View looking Northeast of Huber Breaker (left), Retail Coal ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. View looking Northeast of Huber Breaker (left), Retail Coal Storage Bins (center), and Power Station (right foreground) Photograph taken by George Harven - Huber Coal Breaker, Breaker, 101 South Main Street, Ashley, Luzerne County, PA

496

29. Another view looking Northeast closer to Huber Breaker (left), ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

29. Another view looking Northeast closer to Huber Breaker (left), Retail Coal Storage Bins (Center), Power Plant (right) Photograph taken by George Harven - Huber Coal Breaker, 101 South Main Street, Ashley, Luzerne County, PA

497

28. View looking Northeast, Huber Breaker (left), Retail Coal Storage ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

28. View looking Northeast, Huber Breaker (left), Retail Coal Storage Bins (Center) Power Plant (right) Photograph taken by George Harven - Huber Coal Breaker, 101 South Main Street, Ashley, Luzerne County, PA

498

2. EXTERIOR VIEW OF THE FRONT AND NORTHEAST SIDE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR VIEW OF THE FRONT AND NORTHEAST SIDE OF BUILDING 651 FACING SOUTH. - U.S. Naval Base, Pearl Harbor, Shore Intermediate-Maintenance Facility, Corner of Morton & Craig Streets, Pearl City, Honolulu County, HI

499

3. EXTERIOR VIEW OF THE REAR AND NORTHEAST SIDE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR VIEW OF THE REAR AND NORTHEAST SIDE OF BUILDING 651 FACING WEST. - U.S. Naval Base, Pearl Harbor, Shore Intermediate-Maintenance Facility, Corner of Morton & Craig Streets, Pearl City, Honolulu County, HI

500

6. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. CLEAR SHOP OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. CLEAR SHOP OF CANOPY 723 AS WELL NORTH FACADES OF ADDITIONS TO BUILDING 10. - NASA Industrial Plant, Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA