ژئوشیمی و پترولوژی ریولیتهای قرهداش شاهیندژ- شمالغرب ایران: بررسی خصوصیات ژئوشیمیایی ولکانیسم پس از برخوردی
الموضوعات :معصومه آهنگری 1 , معصومه نظری 2 , محسن موذن 3
1 - دانشگاه ارومیه
2 - دانشگاه تبریز
3 - دانشگاه تبریز
الکلمات المفتاحية: ریولیت, ژئوشیمی, پرآلومینوس, محیط تکتونیکی پس از برخوردی, شاهیندژ, ایران مرکزی. ,
ملخص المقالة :
ریولیتهای قرهداش شاهیندژ از نوع ریولیتهای پرآلومینوس با مقدار SiO2 و K2O بالا هستند. این سنگها از درشت بلورهای کوارتز، فلدسپار پتاسیم به همراه مقادیر اندک پلاژیوکلاز در زمینهای ریزدانه و غنی از فلدسپارهای پتاسیم تشکیل یافتهاند. از لحاظ ژئوشیمیایی این سنگها از LREEها و LILEها غنی شده هستند و در مقابل مقدار HREEها و HFSEها تهیشدگی نشان میدهد. بررسی روابط صحرایی، بافتی و سنگشناسی به همراه ویژگیهای ژئوشیمیایی سنگ کل نشان میدهند ماگمای بهوجود آورنده ریولیتهای قرهداش دارای منشأ پوستهای است که بواسطه تفریق بلوری (پلاژیوکلاز و تیتانومگنتیت) ترکیب آن دستخوش تغییر شده است. آنومالی منفی Eu، Sr و Ti در نمودارهای چند عنصری بیانگر تفریق بلوری است. ویژگیهای ژئوشیمیایی ریولیتهای قرهداش مانند مقادیر نسبتهای Rb/Nb، K/Rb، Rb/Sr، Rb/Ba و Ga/Al مشابه با گرانیتها/ ریولیتهای A-Type در محیطهای پس از برخوردی هستند. با در نظر گرفتن سن پرکامبرین برای این توده، به احتمال زیاد فازهای کششی بعد از بسته شدن اقیانوس پروتوتتیس عامل تشکیل این توده بوده است.
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