بررسی بافت و دمای تبلور سنگ‎های سینو‎گرانیتی نوع S جنوب قره‎‎‎زاغ (شمال‎غرب ایران)

نوع مقاله : مقاله پژوهشی

نویسنده

گروه زمین شناسی، دانشگاه پیام نور، صندوق پستی 4697-19395 تهران، ایران

چکیده

توده نفوذی جنوب قره‎‎‎زاغ در شمال‎غرب مجموعه دگرگونی سورسات برونزد دارد که از نظر ساختاری بخشی از پهنه سنندج-سیرجان است. بخش‎های همگن و یکنواختی از توده نفوذی جنوب قره‎‎‎زاغ در پهنه برشی قرار دارند و میلونیتی شده­اند. بلورهای زیرکن در توده نفوذی و میلونیتی جنوب قره‎ زاغ از نظر ریخت‎شناسی شامل منشورهای {110} و هرم‎های {211} گسترش یافته بوده که گویای تبلور آن­ها از ماگماهای با خاستگاه نوع S هستند. در بخش‎های توده‎ای و میلونیتی توده جنوب قره‎‎‎زاغ، کمترین دمای تبلور براساس ریخت‎شناسی زیرکن، دماسنجی اشباع زیرکن و زمین­شیمی سنگ کل 698 تا oC 770 محاسبه شده است. همچنین بر پایه دما فشارسنجی کانی بیوتیت نیز دما oC 677 و فشار 8/0 کیلوبار به دست آمده است. شواهد بافتی و بررسی دگرشکلی‎ها نشان می‎دهد که تغییرات شیمیایی و بافتی به صورت تدریجی همراه با پیشرفت دگرشکلی در میلونیت‎ها رخ داده است. در اثر تغییرات بافتی، دانه‎های کوارتز بازتبلور یافته­اند و مهاجرت مرز دانه‎ای در بازتبلور مشخص بوده که گویای دگرشکلی در رخساره دگرگونی شیست‎سبز است.     

کلیدواژه‌ها

عنوان مقاله [English]

The Study Petrofabric and Thermometry of South-Gharezagh S-type Syenogranite rocks (NW Iran)

نویسنده [English]

  • Mahboobeh Jamshidibadr
Associate Professor, Geology Department, Payame Noor University, 19395-4697 Tehran, IRAN.
چکیده [English]

The South-Gharezagh intrusive exposed in northwest of the Sorsat metamorphic complex, which is structurally a part of the Sanandaj-Sirjan zone. Intrusive of South-Gharezagh is located in the shear zone and are mylonitized. Morphologically, the crystallization of zircon in the intrusive and mylonitic mass of South-Gharezagh includes {110} prisms and {211} pyramids, which indicates their crystallization from S-type magmas. The crystallization temperature is calculated to be 698 to 770 ◦C, based on the morphology of zircon, in the massive and mylonitic parts of the South-Gharezagh massif, zircon saturation thermometry and geochemistry of the whole rock. In addition, the thermobarometric chemistry of biotite mineral has been calculated at a temperature of 677 ◦C and a pressure of 0.8 kbar. The petrofabric evidence shows that chemical and petrofabric changes have been gradually occurred along with the deformation progress in mylonites. As a result of petrofabric, the recrystallized quartz grains and the migration of the grain boundary in the recrystallization is clear, which indicates a change in the facies of the green schist metamorphism.

کلیدواژه‌ها [English]

  • zircon morphology
  • Mineral chemistry
  • thermometry
  • Sanandaj-Sirjan Zone

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  • تاریخ دریافت: 02 اردیبهشت 1402
  • تاریخ بازنگری: 26 تیر 1402
  • تاریخ پذیرش: 03 مرداد 1402

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