نتایج جستجو برای: dacite

تعداد نتایج: 251  

ژورنال: بلورشناسی و کانی شناسی ایران 2009
آلیانی, فرهاد, عباسلو, زهرا, علیرضایی, علی , مرادیان, عباس ,

The study area is located in Central Iranian volcano-plutonic copper belt (Dehaj-Sarduiyeh belt) about 42 Km northeast of Shahrbabak in Kerman Province. Based on petrographic studies, extrusive rocks have the composition from trachyandesite, andesite basaltic and andesite to dacite with Eocene age. Mineralogically, the rocks contain plagioclase, amphibole, biotite and quartz. Chlorite, calcite,...

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ژورنال: بلورشناسی و کانی شناسی ایران 2002
اعتمادی, بیژن, جعفری, یاسمن, کرمی, بهروز,

The Zonuz irregular lens shaped kaolin deposit located in Marand, Azarbaygan, is exploited as an openpit. Andesite, Trachyandesite and dacite igneous rocks are located in south, west and east parts of the deposit, respectively. The Ore was analysed by XRD, SEM and NAA. Assemblage of major minerals including Quartz, Kaolinite, Illite and Calcite, and minor minerals of Dolomite, Montmorillo...

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ژورنال: بلورشناسی و کانی شناسی ایران 2011
کنعانیان, علی , حسن‌پور, شهره, سرجوقیان, فاطمه, معانی‌جو, محمد, یداللٌهی, روح الله ,

Eocene- Oligocene volcanic and subvolcanic bodies of Masjed-Daghi Located in 35 km East of Jolfa close of Aras River. On the base of structural geology the study area is a part of the West Alborz-Azarbayejan zone. Volcanic rocks are rhyolite, dacite to trachyandesite and subvolcanic rocks are porphyritic monzonite to diorite. The Formation of these rocks related to  subduction zone in an active...

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ژورنال: بلورشناسی و کانی شناسی ایران 2011
نصیری بزنجانی, رسول, شهریاری, شاهین, قربانی, محمدرضا,

The tectonic settings for the Urumieh-Dokhtar volcanic-plutonic belt provided by different reaserchers including active continental margin rift and post collisional settings. Geochemical and tectonic studies indicate that this belt belongs to the active continental margin. Basaltic andesite, andesite, trachy andesite, trachy dacite and dacitic rocks in NE Naragh, of the Urumieh-Dokhtar magmatic...

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Journal: :British journal of environmental studies 2023

The exposure of Mesozoic rocks in the Mangilu area, both as a result tectonic deformation form mélange, low-high degree metamorphism and deep-sea sediments (flysch, radiolarian cherts, sediment flow olistostrome), which formed subduction zone indicates complex accretionary rocks. purpose this study is to identify trace era. method used was field observation, including collection geological data...

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پایان نامه :وزارت علوم، تحقیقات و فناوری - پژوهشکده علوم زمین سازمان زمین شناسی و اکتشافات مع 1390
پروانه کونانی, مرتضی خلعت بری جعفری, سید جعفر عمرانی,

the neogene intrusion masses in the noudeh-enghelab area located to the north of sabzevar ophiolite have cut the late cretaceous ophiolitic rocks, sedimentary- volcanic and eocene volcanic rocks and have been covered by pliocene and quaternary deposits. the margin is of lava with basalt, phyric andesite-basalt and andesite and the central parts (dome shaped) composed of phyric andesite-trachyan...

Journal: :International Geology Review 2023

A small tonalite – dacite body has been discovered in the Nakanogawa Group, Hidaka Belt, northern Japan, which is a Palaeogene subduction complex formed palaeo-Japan trench along northeastern margin of Eurasia. The tonalites are characterized by extremely low K2O (0.2–0.3 wt.%) and relatively flat chondrite-normalized rare earth element patterns (La/Yb[N] ~2.3), similar to plagiogranites ophiol...

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Journal: :Geochimica et Cosmochimica Acta 2016

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Journal: :GEOCHEMICAL JOURNAL 1995

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ژورنال: بلورشناسی و کانی شناسی ایران 2021
Alavi, , Yadegari, ,

Arazgoni Kaolin deposit is located in East Azarbaijan Province, about 18 km south of Qara Aghaj, the center of Charoymaq city. The area under investigation, in the geological zoning of Iran, is a part of the Urmia-Dokhtar volcanic-plutonic belt. Most of the study area is composed of volcanic rocks with Oligo-Miocene dacite-andesitic composition which have been strongly altered by hydrothermal a...

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