نتایج جستجو برای: cimmerian
تعداد نتایج: 51 فیلتر نتایج به سال:
Amphibolites are one of the major rock units in the Posht-e-Badam ophiolite that are formed by metamorphism of basalts. There are tow types of amphibolite in the Posht -e- Badam ophiolite: 1) amphibolites with intermediate plagioclase (first type), amphibole, plagioclase, quartz, sphene, ilmenite, apatite, sericite and epidote, 2) amphibolites with high content of anorthite (second type), amphi...
The Mashhad ophiolitic and metamorphic complex was intruded by Mashhad granitoids during different episodes of magmatisms. Dehnow pluton with diorite-granodiorite composition was intruded at earliest stage of magmatism during Late Triassic (Norian, 215± 4My). This pluton is cut by the NW-SE trending ductile shear zones which are dominated by an intense ductile deformation. The rocks of Dehnow p...
The Duna Pb-Ba-(Ag) mine is located ca. 155 km north of Tehran in the central Alborz structural zone, northern Iran. ore mineralization occurs as stratabound, epigenetic, E-W and WSWENE trending veins veinlets fracture-controlled well massive open-space filling textures within a Permian dolomitic limestone host rock. Field observations mineralogical petrographic studies show dolomitization, sil...
three granitoid bodies, shirkuh batholith, kaffe abad and ader bolandan are exposed in nw yazd, cutting across the naiband formation (upper triassic), and overlain by cretaceous formations. shirkuh batholith is most likely of jurassic age. it seems to be the first and the most significant episode of magmatism in studied area which occurred in middle jurassic (late cimmerian) time. on the other ...
The Siyahmansour area is located between longitude 370 46َ 07" to 370 50َ 19" N and latitude 470 53ً 13" to 470 58َ 22" E in northeastern town of Miyaneh Exposure of different igneous rocks in the studied area including Eocene to Miocene volcanic rocks, granitoids and diorites. The granitoids are different including muscovite granites and granite-granodiorite. The muscovite granites are intruded in...
The study area is located in northeastern Iran (south of Mashhad). Paleo-Tethys Ocean opened during Silurian time and subduction under Turan plate was started in Late Devonian. By Late Triassic (225 Ma) there was no Paleo-Tethys left on an Iranian transect, therefore Turan plate obducted over Iran Plate. Two stages of low grade regional metamorphism are exposed, that are related to Hercynian (L...
W. Altermann writes: In their discussion of palaeotectonics and palaeogeography of Malay Peninsula, Harbury et al. propose an alternative interpretation to Sengor’s (1984) model of Triassic or early Jurassic collision of the Cimmerian (Sibumasu) block with the Indochina block in the east. Their interpretation depicts Malay Peninsula as part of Triassic and lower Jurassic Australian Gondwana. ...
introduction in the east and northeast of sanandaj in the qorveh-bijar-takab axis, there are series of basaltic composition volcanoes with quaternary age. the study area is part of the sanandaj-sirjan zone and is located between 47°52' and 47°57' e longitudes and 35°26 and '35°30' n latitudes. due to the location of the volcanic cone on pliocene clastic sediments and quaternary travertine, the ...
introduction the occurrence of blueschist metamorphic facies is believed to mark the existence of former subduction zones. this facies is represented in the main constituents of subduction-accretion complexes, where it occurs in separate tectonic sheets, imbricated slices, lenses, or exotic blocks within a serpentinite mélange (volkova et al., 2011). the evidence of the presence and maturity of...
سازند سیلیسی آواری آبحاجی به سن ژوراسیک پیشین در شرق ایران مرکزی بر روی بلوک¬های یزد، طبس و لوت گسترش دارد. جهت مطالعه این سازند هفت برش در کوه راهدار (منتهی الیه لبه غربی بلوک طبس یا بلوک کلمرد)، سیمین سپاهان، معدن پروده (شمال و شرق بلوک طبس)، کوه شیسویی (غرب بلوک لوت)، راور-دره آبکوه، زرند-دره چناروئیه و زرند-معدن اشکلی (جنوب بلوک طبس) و همچنین سه چاه اکتشافی a، b و c در محدوده معدن زغالسنگ پ...
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