سنگ نگاری، شیمی‌کانی ها و ژئوشیمی سنگ های آتشفشانی پسا افیولیتی در منطقه راتوک (جنوب گزیک، شرق ایران)

زمین شناسی اقتصادی

مقاله 9، دوره 9، شماره 2 - شماره پیاپی 17، آبان 1396، صفحه 439-461   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v9i2.53558

نویسندگان

زهرا واحدی طبس؛ سید سعید محمدی^* ؛ محمد حسین زرین کوب

بیرجند

چکیده

در 60 کیلومتری جنوب گزیک در شرق استان خراسان جنوبی و در بخش شمالی زمین درز سیستان، برون زدهایی از سنگ های آتشفشانی با ترکیب حدواسط (الیگومیوسن) و بازیک (پلیوکواترنر) بر روی واحدهای مجموعه افیولیتی وجود دارد. بر اساس نتایج تجزیه ریزکاو الکترونی، ترکیب کلینوپیروکسن موجود در الیوین بازالت از نوع دیوپسید و الیوین از نوع کریزولیت باMg# بین 81 تا 82 درصد تعیین شد. داده های ژئو‌شیمیایی نمونه های سنگ کل بیانگر کالک آلکالن بودن آندزیت ها و ماهیت آلکالن گدازه های بازالتی است. الگوی عناصر کمیاب گدازه ها به ویژه برای آندزیت ها، غنی شدگی عناصر Ba، K، Cs،Sr وTh ، تهی شدگی عناصر P، Nb، Ti و غنی شدگی LREE نسبت به HREE را نشان می دهد. همچنین نتایج آنالیز نقطه ای کانی کلینوپیروکسن در واحد سنگی الیوین بازالت، دسته ماگمایی آلکالن و محیط زمین‌ساختی درون صفحه ای را برای این سنگ ها تأیید می‌کند. دما- فشارسنجی کلینوپیروکسن در الیوین بازالت ها، دمای حدود 1200 درجه سانتی گراد را برای فشار 6 تا 10 کیلوبار مشخص کرده است.

کلیدواژه‌ها

کلینوپیروکسن؛ آندزیت؛ آلکالی بازالت؛ راتوک، زمین درز سیستان

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