نتایج جستجو برای: metamorphism and igneous

تعداد نتایج: 16828157  

ایزدی کیان, لیلی, سپاهی, علی‌ اصغر, کردی, فریبا,

The study area is located in Hamedan Province adjacent to Alvand plutonic body in the Sanandaj-Sirjan zone. Various contact and regional metamorphic rocks, from low to high grade exist in contact of Alvand plutonic body including schists, hornfelses and migmatites. Kyanite-bearing rocks volumetrically are not widespread but occur as various outcrops (in migmatite, hornfels and quartz-kyanite ve...

رنجبر مقدم, فرشته, همام, سید مسعود,

Detailed microstructural analysis has been conducted in the Ghandab metamorphic Complex, which is one of the most important high temperature – low pressure regional contact metamorphism studied areas in Iran. Textural evidence suggests the sequence of growth of minerals with increasing metamorphic grade and during development of a crenulation foliation. The sequence of mineral growth is conside...

2007
Georg Zellmer David Pyle

Introduction MAG2007 was the first international workshop devoted to bringing together igneous and gas geochemists working on volcanology-related topics. It was held at the Institute of Earth Sciences, Academia Sinica, and at Taiwan’s East Coast, from 22 to 27 April 2007, and hosted an international group of some 45 leading experts and students of volcanology and igneous and gas geochemistry. T...

Journal: :Geological Magazine 1895

2002
J. W. Goodge P. Myrow I. S. Williams S. A. Bowring

New U-Pb ages for detrital and igneous zircons constrain the depositional age and sedimentary provenance of the Beardmore Group, a siliciclastic succession that records transformation of the East Antarctic margin during Rodinia breakup and subsequent Gondwana amalgamation. We divide rocks previously mapped as the Beardmore Group into (1) an inboard late Neoproterozoic assemblage (probably ≤670 ...

Journal: :زمین شناسی اقتصادی 0
فریماه آیتی سعید مهدوری

sakhtehesar mountain is located in urumieh-dokhtar magmatic belt and is composed of volcanic and subvolcanic rocks (pliocene andesite to dacite) which intruded the volcanics and pyroclastics of paleocene age. three alteration zones including potassic, phyllic and propylitic are recognized in the area. in this paper, the mineral chemistry of magmatic and primary biotite and the mineral chemistry...

Bagheri, , Bahramnejad, , Zahedi, ,

The Deh-Salm Metamorphic Complex (DMC) is composed of metapelite, metabasite, metaperidotite, and calc-silicate rocks and is one of the few outcrops of the Lut block’s basement which emerged near to the Sistan suture zone. In the eastern part of the Deh-Salm metamorphic complex, the calc-silicate and marble appeared in the form of elongated tectonic lenses that have been metamorphosed in simila...

Journal: :Highlights of Astronomy 1971

خلیلی, محمود , مکی‌زاده, محمدعلی ,

The calc-silicate xenoliths, within the Shir-Kuh batholith are characterized by melilite, garnet, vesuvianite, and wollastonite mineral assemblage. On the basis of  paragenetic relations, prograde and retrograde metamorphism are involved in the formation of these minerals. Melilite, wollastonite and diopside formed during progressive metamorphism which was accompanied by thermal peak shocking a...

2007

TEM and XRD techniques were used to study crystal growth characteristics of the fabric-forming phyllosilicates which developed in response to low-grade metamorphism and tectonic imbrication in part of the Southern Uplands thrust terrane. Prograde regional metamorphism, ranging from late diagenesis through the anchizone to the epizone, was accompanied by the development of a slaty cleavage which...

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