Sample records for kromit-e nahiye khoy

  1. Structural Analysis of the Khoy Ophiolite, NW Iran from ASTER Imagery

    NASA Astrophysics Data System (ADS)

    Thurmond, A. K.; Abdel-Salam, M.; Yin, Z.; Hassanipak, A.; Ghazi, A. M.


    The Khoy ophiolite in northwestern Iran, along the Turkish border, represents a remnant of oceanic lithosphere formed in the Mesozoic Neotethys. This northwest-southeast trending ophiolite complex consists, from northeast to southwest of a well-defined basal metamorphic zone, peridotites (mainly harzburgites and dunites) and serpentinized peridotites, gabbros, dikes, and extensive amount of pillowand massive basalts and basaltic andesite. The associated sedimentary rocks include a variety of late Cretaceous deep- and shallow-marine rock. These include pelagic fossiliferous carbonates which are mixed with pillow basalts and the basaltic andesites as interlayers or exotic blocks. Also present are extensive units of radiolarian chert which are interbedded within the basalts and basaltic andesites. Analysis of the Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER) imagery covering the Khoy ophiolite and published geological maps allowed us to distinguish between different rocks types and interpret regional structures. ASTER has three bands (1 to 3) in the Visible and Near Infrared (VNIR), six bands (4 to 9) in the Short Wave Infrared (SWIR) and 5 bands (10 to 14) in the Thermal Infrared (TIR) portions of the electromagnetic spectrum. We used 3-2-1, and 7-3-1 ASTER false-color images and 4/7-3/4-2/1 ASTER band-ratio image for this study. The complex is divided into three NW-trending, SW-verging nappes. Upper serpentinized ultramafic rocks and lower amphibolites forming an allochthon with will-developed klippes of ultramafic rocks dominate the northeastern nappe. This nappe is thrust across shelf sediments dominated by limestones of late Cretaceous age that occupy the region to the northeast of the Khoy ophiolite complex. Superimposition of ENE-trending folds on the nappe structures produced domical structures that eroded to form tectonic widows where the amphiolites are exposed within the ultramafic rocks. The central nappe is an allochthon made up

  2. Interseismic accumulation across the Khoy fault from InSAR measurement

    NASA Astrophysics Data System (ADS)

    Mohseni Aref, Mohammad; Çakir, Ziyadin; Karimzadeh, Sadra


    The Khoy fault is part of a long right lateral strike slip fault that runs in NW-SE direction between Çaldıran in eastern Turkey and Tabriz in northwest of Iran within the Turkish-Iranian plateau that accommodates the plate convergence between Eurasia and Arabia. It connects the North Tabriz Fault (NTF) with the Gailatu-Siah Chesmeh and Çaldiran faults, and thus is named here the Çaldiran-Tabriz fault (CTF). The CTF, unlike the North and East Anatolian faults to the west, does not have a clear morphological expression in the topography along much of it length. Active fault maps show a distributed deformation zone. Nevertheless, it has produced several devastating large earthquakes both recently (e.g., Ms 7.3, 1976 Çaldiran earthquake), and historical times (e.g., Ms > 7, 1721 and 1780 Tabriz earthquakes).The recent double earthquakes (Mw 6.5 and 6.2) of August 11th, 2012 in Ahar-Varzaghan area 40-45 km north of the NTF manifest the seismic activity of the region. Recent geodetic studies using GPS InSAR suggest 9±2 mm/yr of slip rate for the NTF, which is significantly higher than geologically determined slip rates (e.g., 2-4 mm/yr). In this study, we use InSAR data acquired from 2003 and 2010 on a descending orbit track of ENVISAT satellite, across the Khoy fault zone, which is the north-western continuation of the NTF north of the Urmia Lake. We use the Stanford method of persistent scatter interferometry (StaMPS) technique to overcome the decorelation problem with time and over large areas. The line of sight velocity field we obtained clearly delineates the shear zone that trends NW-SW aligning with the NTF. We project the mean line of sigh velocity field derived by InSAR time series onto fault parallel horizontal velocity field, assumed that vertical offset rate of the Khoy fault is negligible. Single screw dislocation models in elastic half-space model were applied along the fault zone to estimate slip rate, locking depth and fault location within 95

  3. Fault tree analysis of failure cause of crushing plant and mixing bed hall at Khoy cement factory in Iran☆

    PubMed Central

    Nouri.Gharahasanlou, Ali; Mokhtarei, Ashkan; Khodayarei, Aliasqar; Ataei, Mohammad


    Evaluating and analyzing the risk in the mining industry is a new approach for improving the machinery performance. Reliability, safety, and maintenance management based on the risk analysis can enhance the overall availability and utilization of the mining technological systems. This study investigates the failure occurrence probability of the crushing and mixing bed hall department at Azarabadegan Khoy cement plant by using fault tree analysis (FTA) method. The results of the analysis in 200 h operating interval show that the probability of failure occurrence for crushing, conveyor systems, crushing and mixing bed hall department is 73, 64, and 95 percent respectively and the conveyor belt subsystem found as the most probable system for failure. Finally, maintenance as a method of control and prevent the occurrence of failure is proposed. PMID:26779433

  4. PTt path in metamorphic rocks of the Khoy region (northwest Iran) and their tectonic significance for Cretaceous Tertiary continental collision

    NASA Astrophysics Data System (ADS)

    Azizi, H.; Moinevaziri, H.; Mohajjel, M.; Yagobpoor, A.


    Metamorphic rocks in the Khoy region are exposed between obducted ophiolites to the southwest and sedimentary rocks of Precambrian-Paleozoic age to the northeast. The Qom formation (Oligocene-Miocene) with a basal conglomerate transgressively overlies all of these rocks. The metamorphic rocks consist of both metasediments and metabasites. The metasediments are micaschist, garnet-staurolite schist and garnet-staurolite sillimanite schist with some meta-arkose, marble and quartzite. The metabasites are metamorphosed to greenschist and amphibolite facies from a basaltic and gabbroic protolith of tholeiitic and calc-alkaline rocks. Geothermobarometry based on the equivalence of minerals stability and their paragenesis in these rocks and microprobe analyses by several different methods indicate that metamorphism occurred in a temperature range between 450 and 680 °C at 5.5 and 7.5 kb pressure. Rims of minerals reveal a considerable decrease of pressure (<2 kb) and insignificant decrease of temperature. The PTt path of this metamorphism is normal. The MFG line passes above the triple junction of Al 2SiO 5 polymorphs, and the average geothermal gradient during metamorphism was from 27 to 37 °C/km, which is more concordant with the temperature regime of collision zones. We infer that crustal thickening during post-Cretaceous (possibly Eocene) collision of the Arabian plate and the Azerbaijan-Albourz block was the main factor that caused the metamorphism in the studied area.

  5. Na-rich character of metasomatic/metamorphic fluids inferred from preiswerkite in chromitite pods of the Khoy ophiolite in Iran: Role of chromitites as capsules of trapped fluids

    NASA Astrophysics Data System (ADS)

    Zaeimnia, Fatemeh; Arai, Shoji; Mirmohammadi, Mirsaleh


    We report a new occurrence of preiswerkite, a rare Na- and Al-rich trioctahedral mica (Na-analog of eastonite), from a high-Al (Cr# of chromite 0.4) chromitite pod of the Khoy meta-ophiolite in northwestern Iran. The preiswerkite is euhedral and associated with Ca-Cr-Al-garnet, clinochlore, titanite, and calcite. Preiswerkite and associated minerals fill cavities in the chromitite pod and are absent in the surrounding peridotites. The preiswerkite-rich aggregate is possibly representative of aqueous fluid supplied to the mantle section of the Khoy ophiolite. Peraluminous conditions, which are indispensable for preiswerkite formation, were established only in the pool of fluid trapped by the high-Al chromitite. The fluid and preiswerkite precipitates were isolated from the peridotite by the chromitite capsule. The Na-rich fluid was a precursor of the serpentinization fluid. The fluid is an analog of the fluid released from the subducting slab, which can precipitate jadeite under high-pressure conditions.

  6. MORB to supra-subduction geochemical transition in the extrusive sequences of major upper Cretaceous ophiolites of Iran

    NASA Astrophysics Data System (ADS)

    Babaie, H. A.; Khalatbari Jafari, M.; Moslempour, M. E.


    We discuss the geochemical patterns and tectonomagmatic setting of the extrusive sequences in the Khoy, Kermanshah, Fannuj, Nosratabad, Dehshir, south and north Fariman, and Sabzevar ophiolite massifs of Iran. These sequences include pillow lava, sheet flow, hyaloclastite, hyaloclastic breccia, and interbeds of chert and pelagic limestone with Late Cretaceous micro fauna. The Khoy, north Fariman, and Sabzevar massifs also include Late Cretaceous-Early Paleocene supra-ophiolitic volcanic and volcano-sedimentary rocks that formed in a trough near the extrusive sequence. The Khoy pillow lava displays T-MORB characteristics but no chemical contribution from the components released from the subducted slab. On the other hand, the diabase dikes that cut the Khoy extrusive sequence show signatures of subduction zone magmatism and contribution from the melt released through the partial melting of the subducted slab. While lava in the Harsin (Kermanshah) extrusive sequence in west Iran displays E-MORB and P-MORB characteristics, the pillows in the Fannuj, north Fariman, Dehshir, and Sabzevar extrusive sequences indicate the contribution of both fluids and melt from the subducted slab. The Nosratabad and south Fariman ophiolites also show evidence for either melt or fluids, respectively. Partial melting of the subducted slab sedimentary cover may have formed the acidic pillow lava and sheet flow in the Fannuj and Nosratabad extrusive sequence, respectively. Some pillows in the Nosratabad, Sabzevar, north Fariman, and to a lesser extent, Dehshir extrusive sequence display the OIB geochemical characteristics. Mantle plumes or asthenospheric flow that probably moved up through weak zones of the subducted slab may have affected the partial melting of the mantle wedge above the slab. The combined OIB and supra-subduction characteristics suggest the role of the roll-back of the subducted slab in the magmatism of the northeast Iranian ophiolites. The clear MORB-like geochemical

  7. Health-Related Quality of Life and its Determinants Among Women With Diabetes Mellitus: A Cross-Sectional Analysis

    PubMed Central

    Didarloo, Alireza; Alizadeh, Mohammad


    Background Diabetes is a chronic and threatening condition. However, there are controversies on the factors affecting the health related quality of life (HRQOL) in patients with diabetes. Objectives The current study aimed to evaluate HRQOL and its determinants among females with type II diabetes referred to Diabetes Clinic of Khoy city, Northwest of Iran. Patients and Methods This cross-sectional study was performed on 352 eligible females with diabetes referring to Diabetes Clinic of Khoy. The study data were collected using a three-part instrument including a socio-demographic questionnaire, a questionnaire to assess patients’ knowledge on diabetes and the world health organization’s quality of life (WHOQOL-BREF) questionnaire. Based on descriptive and inferential statistics, analyses were conducted using frequency, independent samples t–test, correlation coefficient and regression analysis. Results The total mean score of QOL was 58.02 ± 17.63. The lowest and the highest mean scores were observed in physical health and social relationship domains (53.84 ± 17.09) and (65.08 ± 14.87), respectively. The regression models revealed that age, education, duration of disease, and family income were significantly associated with all areas of quality of life (P < 0.05). The results also revealed that co-morbidity was significantly correlated with the overall quality of life and the physical health domain (P < 0.01). Conclusions The mean score of quality of life (QOL) in females with diabetes was far from desirable condition. These findings can help physicians and healthcare providers to design suitable interventions to improve the patients QOL. PMID:27331054

  8. Evaluation of thermal comfort conditions in Ourmieh Lake, Iran

    NASA Astrophysics Data System (ADS)

    Farajzadeh, Hassan; Matzarakis, Andreas


    Research in developing countries concerning the relationship of weather and climate conditions with tourism shows a high importance not only because of financial aspects but also an important part of the region's tourism resource base. Monthly mean air temperature, relative humidity, precipitation, vapor pressure, wind velocity, and cloud cover for the period 1985-2005 data collected from four meteorological stations Tabriz, Maragheh, Orumieh, and Khoy were selected. The purpose of this study is to determine the most suitable months for human thermal comfort in Ourmieh Lake, a salt sea in the northwest of Iran. To achieve this, the cooling power and physiologically equivalent temperature (PET) calculated by the RayMan model and the Climate Tourism/Transfer Information Scheme (CTIS) were used. The results based on cooling power indicate that the most favorable period for tourism, sporting, and recreational activities in Ourmieh Lake is between June and October and based on PET between June to September. In addition, the CTIS shows a detailed quantification of the relevant climate-tourism factors.

  9. Psychosocial Correlates of Dietary Behaviour in Type 2 Diabetic Women, Using a Behaviour Change Theory

    PubMed Central

    Shojaeizadeh, D.; asl, R. Gharaaghaji; Niknami, S.; Khorami, A.


    ABSTRACT The study evaluated the efficacy of the Theory of Reasoned Action (TRA), along with self-efficacy to predict dietary behaviour in a group of Iranian women with type 2 diabetes. A sample of 352 diabetic women referred to Khoy Diabetes Clinic, Iran, were selected and given a self-administered survey to assess eating behaviour, using the extended TRA constructs. Bivariate correlations and Enter regression analyses of the extended TRA model were performed with SPSS software. Overall, the proposed model explained 31.6% of variance of behavioural intention and 21.5% of variance of dietary behaviour. Among the model constructs, self-efficacy was the strongest predictor of intentions and dietary practice. In addition to the model variables, visit intervals of patients and source of obtaining information about diabetes from sociodemographic factors were also associated with dietary behaviours of the diabetics. This research has highlighted the relative importance of the extended TRA constructs upon behavioural intention and subsequent behaviour. Therefore, use of the present research model in designing educational interventions to increase adherence to dietary behaviours among diabetic patients was recommended and emphasized. PMID:25076670

  10. Effect of Sleep Hygiene Education on Sleep Quality in Hemodialysis Patients

    PubMed Central

    Soleimani, Farzaneh; Hasanpour-Dehkordi, Ali


    Introduction Sleep is referred a regular, recurring and easily revocable state of organism which is characterized by relative immobility and significant increase in response threshold to environmental stimuli. Sleep disorders are common among haemodialysis patients. Aim The aim of this study was to investigate the effect of sleep hygiene education on sleep quality in haemodialysis patients. Materials and Methods This study is a randomized controlled clinical trial. The participants of this study were 60 haemodialysis patients admitted to the Dialysis Center of Shahid Ayatollah Madani Hospital of Khoy, affiliated with the Urmia University of Medical Sciences. Sampling was done randomly and the partcipants were randomly divided into intervention group (30 patients) and control group (30 patients). Sleep quality of participants was measured before and after the intervention by Pittsburgh Sleep Quality Index (PSQI). Training process for sleep hygiene behaviours was presented to the participants face-to-face. The data were analysed using SPSS 16. Results A significant difference in the mean (standard deviation) score for PSQI (p<0.001) was observed before and after intervention in the intervention group, while in the control group, the difference was not significant (p=0.704), In addition, a significant difference was observed in the mean (standard deviation) score for PSQI between the two, intervention and control groups after the educational intervention (p=0.034). Conclusion Sleep hygiene education, alongside other appro-aches, is a low-cost, accessible and practical method which can be implemented within a short period of time. PMID:28208884

  11. Ophiolites of Iran: Keys to understanding the tectonic evolution of SW Asia: (II) Mesozoic ophiolites

    NASA Astrophysics Data System (ADS)

    Moghadam, Hadi Shafaii; Stern, Robert J.


    Iran is a mosaic of continental terranes of Cadomian (520-600 Ma) age, stitched together along sutures decorated by Paleozoic and Mesozoic ophiolites. Here we present the current understanding of the Mesozoic (and rare Cenozoic) ophiolites of Iran for the international geoscientific audience. We summarize field, chemical and geochronological data from the literature and our own unpublished data. Mesozoic ophiolites of Iran are mostly Cretaceous in age and are related to the Neotethys and associated backarc basins on the S flank of Eurasia. These ophiolites can be subdivided into five belts: 1. Late Cretaceous Zagros outer belt ophiolites (ZOB) along the Main Zagros Thrust including Late Cretaceous-Early Paleocene Maku-Khoy-Salmas ophiolites in NW Iran as well as Kermanshah-Kurdistan, Neyriz and Esfandagheh (Haji Abad) ophiolites, also Late Cretaceous-Eocene ophiolites along the Iraq-Iran border; 2. Late Cretaceous Zagros inner belt ophiolites (ZIB) including Nain, Dehshir, Shahr-e-Babak and Balvard-Baft ophiolites along the southern periphery of the Central Iranian block and bending north into it; 3. Late Cretaceous-Early Paleocene Sabzevar-Torbat-e-Heydarieh ophiolites of NE Iran; 4. Early to Late Cretaceous Birjand-Nehbandan-Tchehel-Kureh ophiolites in eastern Iran between the Lut and Afghan blocks; and 5. Late Jurassic-Cretaceous Makran ophiolites of SE Iran including Kahnuj ophiolites. Most Mesozoic ophiolites of Iran show supra-subduction zone (SSZ) geochemical signatures, indicating that SW Asia was a site of plate convergence during Late Mesozoic time, but also include a significant proportion showing ocean-island basalt affinities, perhaps indicating the involvement of subcontinental lithospheric mantle.

  12. A new international tectonic map of the Arctic (TeMAr) at 1:5 M scale and geodynamic evolution in the Arctic region

    NASA Astrophysics Data System (ADS)

    Petrov, Oleg; Smelror, Morten; Shokalsky, Sergey; Morozov, Andrey; Kashubin, Sergey; Grikurov, Garrik; Sobolev, Nikolay; Petrov, Evgeny


    A new tectonic map of the Arctic (TeMAr) at 1:5 M scale is a part of the international Atlas of Geological Maps of the Circumpolar Arctic, which is being compiled under the aegis of the Commission for the Geological Map of the World (CGMW). Compilation of the TeMAr was initiated in 2009 after the publication of base maps of the Atlas - geological map (geological survey of Canada) and magnetic and gravity maps (geological survey of Norway) - with the use of a wide range of bathymetric, geophysical, geological, isotope and geochronological data, including new dated seabed samples and new bedrock samples obtained during recent field studies on the Arctic territory. Making use of these data in the map legend employing tectonic settings enabled correlation of various onshore and offshore fragments of the map. The map reflects Arctic regions' tectonic structure, which consists principally of orogenic belts of the Neoproterozoic to the Late Mesozoic age, platform and basin sediments that overlie them and rift structures formed in part as a consequence of seafloor spreading in the North East Atlantic. Furthermore, many structures are traced from the land throughout shelf regions and into deepwater parts of the Arctic Ocean and show a tendency to become younger northwards toward the Canada Basin. For example, collisional structures of South Ural were formed in the Late Carboniferous, those in the Middle Urals in the Permian, and those of Polar Ural, Pay-Khoy and Novaya Zemlya in the Late Permian and Triassic. The Triassic traps of Eastern and Western Siberia were followed by Cretaceous basalts of the High Arctic large igneous province (HALIP). Cenozoic rifting and subsequent spreading (ca. 56 Ma) was caused by the propagation of sea-floor spreading in the North East Atlantic penetration into the Central Arctic along the Gakkel Ridge

  13. Magmatic complexes of the Urals as suspect parts of Large Igneous Provinces

    NASA Astrophysics Data System (ADS)

    Puchkov, Victor


    the Paleouralian ocean. The second Paleozoic episode was marked by an eruption of trachytes and carbonatites and is dated between 435 and 455 Ma. The younger complex is Devonian in age and is traced along the western slope of the Urals to Pay-Khoy and Novaya Zemlya. They belong to the LIP called Kola-Dnieper. The last but not the least are the Lower Triassic flood basalts and dykes traced from the easternmost parts of the Southern and Middle Urals to the western margin of the Polar Urals.

  14. Hydrogeochemistry of seasonal variation of Urmia Salt Lake, Iran

    PubMed Central

    Alipour, Samad


    Urmia Lake has been designated as an international park by the United Nations. The lake occupies a 5700 km2 depression in northwestern Iran. Thirteen permanent rivers flow into the lake. Water level in the lake has been decreased 3.5 m in the last decade due to a shortage of precipitation and progressively dry climate. Geologically the lake basin is considered to be a graben of tectonic origin. Na, K, Ca, Li and Mg are the main cations with Cl, SO4, and HCO3 as the main anions. F & Br are the other main elements in the lake. A causeway crossing the lake is under construction, which may affect the lake's annual geochemistry. The main object of this project is mainly to consider the potential of K-mineral production along with ongoing salt production. Seven hundred and four samples were taken and partially analyzed for the main cations and anions. Surface water (0.5 m. depth) was analyzed for Na, K, Mg, Ca, Br and Li, and averaged 87.118 g/lit, 1.48 g/lit, 4.82 g/lit, 4.54 g/lit, 1.19 ppm and 12.7 ppm respectively for the western half of the lake. Sodium ranged between 84 to 91.2 g/lit, and showed higher concentrations in the south than in the north. This unexpected result may be caused by shallower depth in the south and a higher net evaporation effect. Calcium ranged between 4.2 to 5 g/lit, apparently slightly higher in the north. K is higher in the south, possibly due to rivers entering from south that may carry slightly higher K in solution. In the middle-range samples (0.5–5 m.), K averaged 1.43 g/lit and ranged from 1.40 to 1.46 g/lit. At this intermediate depth the distribution of K is clearly higher to the south of the causeway that is currently under construction. It is not clear whether this increase is the effect of the causeway or the effect of the salty Aji-Chay River to the east, and the Khoy salt domes to the north of the lake. At depth (5 m–10 m), K averaged 1.48 g/lit and ranged from 1.4 to 1.49 g/lit, differing only in the second decimal from

  15. Recognition of Intermediate Crust (IC), its construction and its distinctive epeirogenic behaviour: an exciting new tool for plate kinematic analysis (PKA) of the Arctic margins and western Siberia

    NASA Astrophysics Data System (ADS)

    Osmaston, M. F.


    blocking the hydrothermal cooling, this must inhibit magnetic anomaly formation and prolong magmagenesis to give a thicker-than-oceanic mafic crust, which I have called Intermediate Crust (IC) [8, 9], to distinguish it from Mature Continental Crust (MCC). Seismologically, IC basement must look deceptively like that assigned to stretched MCC. For thermodynamic reasons [8, 9] the hydrous content of deep MCC and of deeply subducted UHP crustal slices gives them a big thermal epeirogenic sensitivity which IC lacks. The NE Atlantic offers an example of this distinction. Structurally, the MCC of Greenland and Norway must have been intimately juxtaposed by the Scandian collision, so it was concluded [9] that the crust of the Greenland-Norway continental shelves must mostly be IC of post-Scandian (early Devonian?) age, a character confirmed by their lack of epeirogenic response to laterally conducted heat from the opening N Atlantic, although drainage systems in Norway proper clearly show it. Geometrically, this separation appears to have changed direction sharply, the second and bigger stage also involving separation of Svalbard from near Tromsø, where it had provided northward continuation of a complete Caledonian transect, so it has an IC implication for much of the Barents Sea area (bar the Bjørnøya block). Moving quickly round to the NE side of Baltica, we can begin to trace the separative motions of the Novaya Zemlya - Pay Khoy (NZPK) strip of less-mature MCC, transverse to the Timanian belt, and the associated evolution of the Pechora basin system. In places, faulted IC/MCC epeirogenic contrasts seem to define the size and direction of the IC-generating separation with remarkable precision. A crucial opening-up of this analysis is provided by realizing that the Polar Ural stretch is not MCC, but is merely the huge 585 Ma Voykar-Synya ophiolite, with its metamorphics, resting on a now-crumpled boundary between IC of very different ages. For further understanding we need