Mineral composition and geothermobarometry of Mata basaltic rocks (SouthKerman): An indicator of magma type and tectonic setting

نویسنده

  • Badrzadeh, Zahra
چکیده مقاله:

Basaltic volcanic rocks with pillow structures are exposed at the southeasternmost extremity of the Sanandaj-Sirjan zone.They belong to volcanic-sedimentary complexes that formed in a general northwest-southeast to north-south trend. In this research, the mineral chemistry of clinopyroxene and plagioclases are employed to study physicochemical conditions and paleo-tectonic setting during generation of basaltic rock. Basalts with plagioclase and clinopyroxene, as the major constituents, have porphyritic texture, which groundmass marked by fine grained plagioclase, clinopyroxene, apatite, opaque minerals and chloritized glass with intergranular to intersertal textures. Electron probe micro-analyzer (EMPA) data indicate most of the feldspars are calcic plagioclase with bytownite composition and clinopyroxenes are augite. High Al and low- Ti and Fe3+contents in clinopyroxenes show the major role of Tschermak’s components, specially CaAlAlSiO6 and minor presence of acmite component. Low TiO2 and Na2O and high SiO2 content indicate their tholeiitic affinity. Based on thermobarometric approaches Mata clinopyroxenes were formed at temperatures of about 1150-1200 ˚C and pressures in the range of 5–6 kbars, which approximately corresponds to a crystallization depth of 15-18 km. Clinopyroxenes have geochemical characteristics similar to ones generated in an extensional environment related to back-arc basin setting.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Petrology, tectonic setting and ore mineralization potential of basic rocks in north of Alvand complex, using amphibole and plagioclase composition

The Alvand complex (Hamedan province) comprises several bodies ranging from acidic to intermediate and basic compositions intruded in the regional metamorphic sequence of the area (the Hamedan phyllites) during various magmatic episodes in Jurassic. In northern part of the complex (the Cheshmeh-ghasaban area) there are some outcrops of hornblende gabbro and olivine gabbronorite. The olivine-gab...

متن کامل

Magma Composition and Igneous Rocks

Introduction In the following chapters we will find that nearly all of the varied aspects of volcanism are either directly or indirectly controlled by the chemical composition of magma and the rate at which it cools and solidifies. If you are to understand and appreciate subsequent discussions of volcanoes and related volcanic phenomena, it is essential that you have a good grasp of the basic c...

متن کامل

Mineral chemistry of clinopyroxenes of basalts from south-west of Khoy, NW Iran: determination of tectonic environment and formation conditions of basaltic rocks

The exposed volcanic rocks in south west of the Khoy area consist of basalts with minor amounts of plagioclase-phyric basalts. These rocks are composed of clinopyroxene plus plagioclase and plagioclase phenocrysts, respectively. The basaltic rocks are highly altered and contains high amounts of secondary minerals mainly chlorite and epidote. According to mineral chemistry, the composition of cl...

متن کامل

محیط زمین‎ساختی و ویژگی‌های خاستگاه سنگ‌های آذرین سازند ابرسج (اردوویسین فوقانی)، البرز شرقی، شمال شاهرود

Outcrops of the Upper Ordovician igneous rocks, as basaltic lava and microgabbroic dyke and sill, present within the Abarsej and Ghelli formations in north and southwest of Shahrood. These rocks have basaltic, trachybasaltic and basaltic trachyandesitic composition with alkaline nature. Their parallel patterns on the primitive mantle and chondrite normalized spider diagrams indicate the common ...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


عنوان ژورنال

دوره 29  شماره 2

صفحات  361- 374

تاریخ انتشار 2021-06

با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.

کلمات کلیدی

کلمات کلیدی برای این مقاله ارائه نشده است

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023