دگرگونی پریدوتیت‌های منطقه کال‌کافی (استان اصفهان، ایران مرکزی)

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین شناسی، دانشگاه اصفهان، اصفهان، ایران

چکیده

منطقه کال‌کافی در 65 کیلومتری شمال شرق شهر انارک (استان اصفهان) قرار دارند. متاپریدوتیت‌های این منطقه همراه با متاسدیمنت‌های پالئوزوئیک انارک و در همبری با توده نفوذی ائوسن کال‌کافی دیده می‌شوند. متاپریدوتیت‌ها با سن احتمالی پالئوزوئیک، باقیمانده پوسته اقیانوسی پالئوتتیس محسوب می شوند. مطالعه پتروگرافی نشان می‌دهد که این سنگ‌ها شامل کانی‌های دگرگونی الیوین (فورستریت-کریزولیت) (CaO با توجه به مطالعات صحرایی، شواهد پتروگرافی، شیمی کانی‌ها و نتایج ترمومتری این سنگ‌ها، می‌توان گفت متاپریدوتیت‌های منطقه کال‌کافی به همراه متاسدیمنت‌های انارک، در زمان پالئوزوئیک دچار دگرگونی ناحیه‌ای در حد رخساره شیست سبز شده،‌ سپس در زمان ائوسن در اثر نفوذ فازهای مختلف توده نفوذی کال‌کافی دچار دگرگونی مجاورتی پیشرونده در دمای 680 تا 770 درجه سانتی‌گراد و فشار 5/0 کیلوبار شده‌اند. چنین دما و فشار بیانگر دگرگونی در حد رخساره پیروکسن هورنفلس می‌باشد. سرپانتینی شدن بخشی از الیوین‌ها و ارتوپیروکسن‌ها، و جایگزینی حاشیه برخی از ترمولیت‌ها توسط کلریت، بیانگر رخداد دگرگونی برگشتی پس از دگرگونی پیش رونده در این سنگ‌ها می‌باشد.

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