Gondwana basins of Orissa State constitute a major part of the Mahanadi Master Basin. These Gondwana sediments, ranging from Asselian to Albian in age, contain remnants of three basic floral assemblages i.e. Glossopteris Assemblage, Dicroidium Assemblage and Ptilophyllum Assemblage which can be ...

Recent investigations carried out in the Ib River Coalfield, Mahanadi Master Basin, Orissa, identified some fossilif-erous beds in the Lower Gondwana deposits. Two exposures of the Lower Kamthi Formation yielded diverse and abundant plant remains, which include Neomariopteris, Vertebraria, and a scale leaf along with 14 Glossopteris ...

The Ib-River Coalfield in Orissa State is a part of Mahanadi Master Basin. Recent extensive investigations were conducted in this Coalfield to locate fossiliferous beds in the Lower Gondwana deposits and as a result a large cache of plant fossils were recovered from Lower Permian sediments (Barakar Formation) exposed in Jurabaga and ...

Recent extensive investigations carried out in the Ib River Coalfield, Mahanadi Master Basin, Orissa, identified numerous fossiliferous beds in the lower Gondwana deposits. Six exposures of the Barakar and lower Kamthi formations yielded diverse and abundant plant remains. The flora includes twenty-three genera representing nine groups ...

The geological results obtained in the Candiota Region by NUCLEBRAS, during the evaluation of the uranium economic potential from basal Gondwana Sequence - Itarare Group and Rio Bonito Formation - at South-East of the Parana Sedimentary Basin, are studied...

Answers to these questions will clarify the paeloclimatic, basinal, and tectonic history of this part of Gondwana, elucidate the colonization of near-polar ...

Jul 9, 2010 ... 3) testing the hypothesis that Gondwana glaciation was a major factor driving ... 2 sites (Permian Weller Coal Measures, Triassic Feather ...

3) testing the hypothesis that Gondwana glaciation was a major factor ... 7) Mt. Robison - 2 sites (Permian Weller Coal Measures, Triassic Feather and ...

3) testing the hypothesis that Gondwana glaciation was a major factor ... 1) Portal Mountain - 2 sites (Permian Weller Coal Measures, Triassic Feather ...

Basins within the African sector of Gondwana contain a Late Palaeozoic to Early Mesozoic Gondwana sequence unconformably overlying Precambrian basement in the interior and mid-Palaeozoic strata along the palaeo-Pacific margin. Small sea-board Pacific basins form an exception in having a Carboniferous to Early ...

Basins within the African sector of Gondwana contain a Late Palaeozoic to Early Mesozoic Gondwana sequence unconformably overlying Precambrian basement in the interior and mid-Palaeozoic strata along the palaeo-Pacific margin. Small sea-board Pacific basins form an exception in having a Carboniferous to Early ...

The New England orocline lies within the Eastern Australian segment of the Terra Australis accretionary orogen and developed during the late Paleozoic to early Mesozoic Gondwanide Orogeny (310�230 Ma) that extended along the Pacific margin of the Gondwana supercontinent. The orocline deformed a pre-Permian arc assemblage consisting of a western magmatic arc, an adjoining ...

accreted (ca. 455 Ma) Carolina ter- rane rifted from Laurentia and was transferred to an oceanic plate, and the ultimate Gondwanan collision with Laurentia. Additionally, successor basins (variously called overlap the termi- nal collision of Gondwana and Laurentia in the late Mississippian through Pennsylvanian. Ganderia

... Lower Gondwana sediments from Pachwara Coalfield, Rajmahal Hills, Bihar, India. Indian Journal of Earth Science 17:208�218. ... spores and pollen grains from the Rajmahal Hills, Bihar, India: with a discu...

... de Geologia, Belo Horizonte, Sumário das comunicações e conferências:. 65�66. Salvi, J., A. Jasper, F. Ricardi- ... ...

The existence and subsequent fragmentation of the Gondwana supercontinent are well established in the geological literature. Debate continues, however, on the exact prefragmentation geometry and the causative process of breakup. The easter Walvis Ridge and the Agulhas and the Mozambique plateaus, which surround southern Africa, exhibit geophysically anomalous oceanic crust and ...

The Argentine Precordillera is a continental fragment rifted from the Ouachita embayment of the southern margin of Laurentia (North America) during Cambrian time [about 515 million years ago (Ma)] and accreted to the western margin of Gondwana (South America) during Ordovician time (about 455 Ma). Similarities of Cambrian stratigraphic successions and faunas, Grenville ...

The 450 km long South Island Alpine Fault, New Zealand, is one of the more renowned strike-slip plate boundary segments world-wide. However, gravity modelling of the 30-50 per cent crustal thinning beneath the eastern South Island shelf break suggests that the South Island may be bound along its eastern boundary by an even longer, c 700 km long, strike-slip fault system. The ...

After the stabilization of the central Gondwana Craton, orogenic belts were accreted, as a result of convergence events and an extensive passive margin developed in southwestern Gondwana. Thermal subsidence in Parana, Karoo-Ventania basins and the Late Paleozoic-Early Mesozoic rifts, were modified by the Gondwana ...

The Hawasina napper of the Oman Mountains yielded Permian radiolarians from cherts stratigraphically overlying a thick volcanic basement (Al Jil Formation) at the base of the Hamrat Duru Group. This fauna represents the first Permian radiolarians and radiolarites in the central and western Tethyan realm. A Permain age for pelagic sequences within the Hawasina Complex of Oman has major significance ...

The Hawasina nappes of the Oman Mountains yielded Permian radiolarians from cherts stratigraphically overlying a thick volcanic basement (AI Jil Formation) at the base of the Hamrat Duru Group. This fauna represents the first Permian radiolarians and radiolarites in the central and western Tethyan realm. A Permian age for pelagic sequences within the Hawasina Complex of Oman has major significance ...

The timing and causes that led to Gondwana break-up remain controversial to date. An earlier opening of the Central Atlantic (Late Sinemurian, ca. 190 Ma) has been recently suggested, and new published models of the East Gondwana evolution allow for a breakup timing closer to Karoo volcanism (ca. 180 Ma). In this contribution we revise the early evolution ...

The most prevalent Phanerozoic glaciation occurred during the Carboniferous Permian on the Southern Hemisphere Gondwana supercontinent. Sediments from the Pennsylvanian Dwyka Group deposited in the Karoo Basin of South Africa provide a complete record of glaciation and deglaciation phases. The direct correlation of glaciation events in southern ...

The transition, in the New Zealand region, from the convergent Gondwana margin (c. 110 Ma) along the north Chatham Rise to seafloor spreading along the rifted Sub-Antarctic Margin (c. 85 Ma) of the Southeast Chatham Rise and Campbell Plateau is an important period for understanding the break-up processes of a super-continent/convergent margin and the associated ...

The Karoo basins of south-central Africa evolved during the first-order cycle of supercontinent assembly and breakup of Pangea, under the influence of two distinct tectonic regimes sourced from the southern and northern margins of Gondwana. The southern tectonic regime was related to processes of subduction and orogenesis along the Panthalassan ...

Increasing evidence of Permian volcanic activity along the South American portion of the Gondwana proto-Pacific margin has directed attention to its potential presence in the stratigraphic record of adjacent basins. In recent years, tuffaceous horizons have been identified in late Early Permian through Middle Permian (280 260 Ma) sections of the Paran� ...

The Mahanadi Basin is a NW-SE stretching Gondwana basin perpendicular to the east coast of India. The metamorphic basement to the basin mainly comprises rocks of the Eastern Ghats Mobile Belt (EGMB) which experienced a complex thermotectonic evolution involving several episodes of deformation and magmatism. It can ...

The Fairway Ridge is a buried continental structure that separates the Fairway Basin from the New Caledonia Basin. The proposed Cretaceous age of the Fairway Basin has remained highly hypothetical to date. Deep offshore petroleum exploration wells revealed well-dated Mesozoic carbonaceous sedimentary rocks in the Taranaki ...

the North China, Tarim, Yangtze, Cathaysian plates, and parts of the Siberia and Gondwana plates, the Yunnan- Guizhou Plateau, and the Tarim, Junggar and Sichuan basins. It averages 1000�2000 m in elevation21), Yunnan-Guizhou Plateau (A27, and A16), islands (A26 and A23), river deltas (A24 and A04

The Appalachian Mountains, now terminating abruptly at the Gulf of Mexico coastal plain, may have formerly continued into southern South America. Rocks forming the basement of the Argentine Andes can be interpreted as remnants of an early Paleozoic orogen, the Famatinian belt, not unlike the Taconic Appalachians. Both orogens are bordered to the west (present coordinates) by lower Paleozoic ...

Marginal basins with ocean crust existed in the Black Sea area in Triassic time behind a volcanic arc built on top of the Hercynian basement of Pontides. The eastern extension of the arc was in the fore-Caucasus. Triassic sediments and volcanics, formed in forearc basins, can be traced from the southern slope of the Great Caucasus (Svanetia) to the ...

A new correlation of 85 well logs provides the data for a continuous set of structure and isopach maps covering one square degree of longitude and latitude from 101 to 102 west and 32 to 33 north. A corresponding set of maps showing paleogeography and tectonics relates each of the above maps to its surroundings in the southwest quarter of North America. A further set of maps of the globe then ...

There are many controversial ideas about how Gondwana broke up with different ... Gondwana GGPP will bring together specialists in Geology, Geophysics, ...

Antarctica's geology is mostly obscured by thick, moving ice that covers 95% of the land and continental shelf. Reconnaissance investigations of outcrops, shallow boreholes, and geophysical surveys are limited and peripheral owing to ice coverage. However, it is possible to outline substantial elements of the regional geology. Further insight is gained by comparison to analogous ...

Australia's southern margin extends for almost 4000 km, from the Naturaliste Plateau in the west to the South Tasman Rise in the southeast, and developed from the Gondwana rift system which also gave rise to the Bass basin and prolific Gippsland basin of southeastern Australia. It incorporates six major sedimentary ...

Stratigraphic and sedimentological fieldwork on the Falkland Islands confirms that they were originally part of South Africa. East and West Falkland have contrasting geological and deformation histories and are separated by the Falkland Sound fault, which marks a significant deformation edge to the Cape Fold Belt. The degree of structural deformation and metamorphism in West Falkland is ...

Precambrian Events in the Gondwana Fragments Entry ID: ASAC_282. [ Update this Record ]. Updating this record requires registration. (Account holders) ...

Abstract: The aim of the research is to contribute to the geological reconstruction of the continental fragments around the Paleopacific margin of Gondwana ...

Constraining the paleogeography of the Rodinia-Gondwana supercontinent cycle is an enigmatic problem that is largely complicated by the difficulties in discerning sutures that represent intercratonic basin closure versus ocean closure. The timing and tectonic style of the Gondwana supercontinent assembly can be tested by comparing ...

Fragments of the former Australian continental margin in East Gondwana occur as submarine plateaus and rises in the southwestern Pacific. This study examined the isotopic composition and zircon age populations in the low and high grade metamorphic rocks along the southern margin of the active Woodlark Basin to evaluate whether these rocks were derived from ...

Ar-Ar data from fabric-forming white mica in slates, syntectonic quartz veins and granitic mylonites constrain the timing of metamorphism, deformation, and exhumation in the Lachlan orogen, Australia. These data also help define the tectonic evolution of the Tasmanides during Paleozoic time. The Lachlan orogen formed by the progressive accretion of a thick turbidite fan sequence and volcanic ...

The geodynamical history of the SW Pacific is controlled since the Mesozoic by the evolution of peri-Pacific subduction zones, in a trench retreat by slab roll-back process, which successively occurred along the Eastern Gondwana margin. In this context, most basins which formed after 45 Ma reached a stage of seafloor spreading, have recorded the inversions ...

The super cyclone that crossed the Orissa coast near Paradeep port (20.3 N, 86.7 E) around 0600 UTC on 29 October 1999, caused enormous damage - death of 10,000 people and 400,000 cattle, property damage worth Ind. Rs. 10,000 crores ( about USD 2 billion), salinization of about 1.8 million hectares of agricultural land, destruction of paddy crop paddy crop worth Ind. Rs.1,500 ...

The hydrocarbon-rich Gippsland, Bass and Otway basins of Bass Strait were intiatied by Neocomian N-S rifting of Australia from Antarctica, their architecture strongly influenced by Paleozoic basement fabric. In the Aptian-Albain, the rift received [approximately]10[sup 6] km[sup 3] of volcaniclastic sediment from the inferred arc along Gondwana's ...

The Jurassic and Cretaceous sedimentary history of northern Somalia and the Morondava Basin of south-western Madagascar have been studied. Both regions display an independent facial development; however, a comparison of the sequential evolution of the Mesozoic sedimentary successions in these two presently widely separated areas reveals a surprisingly high level of similarity, ...

The Paleozoic French Variscan Belt in Massif Central and Massif Armoricain is a collision belt that provides a good example of a suture zone where ophiolites are rare, and the frontal (i.e., the magmatic arc) part of the upper plate is not present. In the lower plate (or Gondwana), the continental rocks are subdivided into an Upper Gneiss Unit (UGU) and a Lower Gneiss Unit ...

The Antarctica Peninsula (AP) lies on a medium-size block of continental crust and is one of a mosaic of west Antarctica coastal block that underwent a complex tectonic evolution during Gondwana breakup. The peninsula represents the eroded roots of a microcontinental volcanic arc; this arc lay above the easterly subducting proto-Pacific plate, and was active throughout the ...

The evolution of the Weddell basin constitutes the keystone for Gondwana reconstructions. During the last decade major exploration efforts including marine and aerogeophysical surveys and OPD drilling have been directed toward the evolution of the Weddell sector. As a result of these efforts, they can now show that the Weddell basin ...

Cyclicity in Carboniferous stratigraphic successions has long been attributed to tectonism and climate, but the ways these variables interact to determine the architecture of sedimentary basin fills remain a subject of intense debate. Geophysical well logs and cores from the Black Warrior basin were used to test the effects of tectonism and climate on ...

Exploration and exploitation of groundwater in sedimentary areas are reasonably simple. However, the problem of salinity in coastal areas makes the job very difficult, especially when the freshwater aquifers are not extensive and are entrapped between saline aquifers. States along the eastern coast of India, particularly Orissa with respect to the Mahanadi ...

The Raniganj basin in the Damodar valley of eastern India is located within the riftogenic Gondwana Master-Basin. The fluvio-lacustrine deposits of the Lower Triassic Panchet formation of the Damodar valley in the study area preserve various soft-sediment deformation structures such as slump folds, convolute laminae, flame structures, ...

From the early Mesozoic until the Holocene, the African continent was generally in a state of extension, based on plate tectonic reconstructions and sedimentary basin subsidence studies. Beginning with the breakup of Gondwana in the Permian-Triassic, this resulted in the formation of the present-day African continental margins and a series of ...

... the Nandankanan Zoo in the state of Orissa, India. Information about the disease and contamination issues are ... ...

The research performed in the last decade in the basement of the Andes have shown that the Precambrian and Paleozoic rocks have recorded a series of igneous and metamorphic events through time. These episodes can be grouped in discrete orogenic events, which have different paleogeographic distribution and intensity. The first and most important orogenic event is widely distributed along the margin ...

For the last decade, only three cratonic blocks (Amazonian, S. Francisco and Rio de LaPlata) were attributed to the South America portion for the Rodinia reconstitution. The probability of existing other blocks has been ignored. Taking into account a large gravity survey, the premise of a considerable Paleoproterozoic fragment as part of the Paran� basin basement is ...

Interpretation of new seismic data shows that all the elements of a favorable petroleum geology exist on the North Falkland shelf and therefore that the area will become an important petroleum province of the future. Spectrum Energy and Information Technology Ltd. acquired approximately 7,500 line km of speculative seismic data during 1993--94 over the continental shelf north of the Falkland ...

The countries of south-central Asia (Afghanistan to Thailand) are made up of fragments of Gondwana that collided with the southern margin of Eurasia during the Mesozoic and Cenozoic. The Cimmerian terranes (Turkey, Iran, Afghanistan, Qiang Tang, and Burma-Malaya) rifted away from Gondwana beginning in the Late Carboniferous and were accreted to Asia during ...

Recent studies and the reinterpretation of pertinent literature reveal the presence of texturally immature first-cycle quartzarenite of fluvial origin. These finds contradict the generally accepted views that (a) quartzarenites are texturally mature and are the products of a multicycle process, and (b) first-cycle quartzarenites are rare in the geological record and genesis is attributed to a ...

The Triassic Indosinian Orogeny followed extinction of the Palaeotethys Ocean resulting in suturing of Gondwana affinity and Cathaysian blocks. The Gondwana affinity Sinoburmalaya block of Peninsular Malaysia, characterized by Carboniferous�Permian mudstones containing glacial dropstones and sparse fauna and flora, is traced extensively into Sumatra. ...

The seafloor spreading evolution in the Southern Indian Ocean is key to understanding the initial breakup of Gondwana. We summarize the structural lineaments deduced from the GEOSAT 10 Hz sampled raw altimetry data as well as satellite derived gravity anomaly map and the magnetic anomaly lineation trends from vector magnetic anomalies in the West Enderby ...

Bangladesh is a part of the Bengal basin, bordered to the west and northwest by Jurassic-early Cretaceous volcanic trap rocks of the Rajmahal Hills, underlain by Precambrian shield and Gondwana sediments. The Bengal basin is the largest delta basin (approximately 23,000 sq miles) in the world, at the confluence of ...

Rift basins of the Central Atlantic Margins (CAM) of North America and Morocco preserve largely continental sequences of sedimentary strata and less important minor basalt flows spanning much of the early Mesozoic. The best known is the Newark basin of New Jersey, New York, and Pennsylvania where an astronomically calibrated magnetic polarity time scale is ...

Fossil crocodyliforms discovered in recent years have revealed a level of morphological and ecological diversity not exhibited by extant members of the group. This diversity is particularly notable among taxa of the Cretaceous Period (144-65 million years ago) recovered from former Gondwanan landmasses. Here we report the discovery of a new species of Cretaceous notosuchian crocodyliform from the ...

The Taranaki basin, which extends offshore between the north and south island of New Zealand, contains several large gas fields (e.g., Maui field) and smaller oil fields. The Taranaki basin is New Zealand's only productive hydrocarbon basin. The basin trends north-south, is asymmetrical in cross section, ...

The tectonic evolution of the proto-Andean margin of western Gondwana has been commonly seen in terms of terrane accretion processes, requiring the existence of early Palaeozoic terrane boundaries and associated sutures. A new study of the Cord�n de Lila Ordovician volcano-sedimentary successions in northern Chile reveals for the first time an arc assemblage deposited on ...

The structural framework of the Brazilian continental margin is basically composed of eight structural types: antithetic tilted step-fault blocks, synthetic untilted step-fault blocks, structural inversion axes, hinges with compensation grabens, homoclinal structures, growth faults with rollovers, diapirs, and igneous structures. The antithetic tilted and synthetic untilted step-fault blocks are ...

The seafloor spreading evolution in the Southern Indian Ocean are key to understanding the initial breakup of Gondwana. However, marine geophysical data are sparse and the seafloor spreading history is still speculative in the Southern Indian Ocean. To reveal the seafloor spreading in the West Enderby Basin, Southern Indian Ocean, we use the lineaments ...

The Jurassic Latady Basin (southern Antarctic Peninsula) developed in a broad rift zone associated with the early stages of Gondwana extension. Early Jurassic sedimentation (�185 Ma) occurred in small, isolated terrestrial to lacustrine rift basins in the present-day northwest and west and became shallow marine by the early Middle ...

This symposium presents the tectonic evolution of Gondwana land using radiometric analysis. Geochronological results and uranium occurrences in Gondwana sequences are also shown. (M.V.M.). (Atomindex citation 23:085402)

... A Pre-Glacial, Warm-Temperate Floral Belt in Gondwana (Late Visean, Early Carboniferous)ROBERTO IANNUZZIa and HERMANN ... both the Early and Late Carboniferous floras of Gondwana. These floras can be corr...