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زهرا واحدی طبس سید سعید محمدی محمد حسین زرین کوب

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.

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ارجاع به مقاله
واحدی طبس ز., محمدی س. س., & زرین کوب م. ح. (2017). سنگ نگاری، شیمی‌کانی ها و ژئوشیمی سنگ های آتشفشانی پسا افیولیتی در منطقه راتوک (جنوب گزیک، شرق ایران). زمین‌شناسی اقتصادی, 9(2), 439-461. https://doi.org/10.22067/econg.v9i2.53558
نوع مقاله
علمی- پژوهشی