بررسی زمین شناسی، سنگ نگاری، شیمی‌ کانی ها و سیالات درگیر اسکارن آهن کلاته‌ شب (شرق سربیشه، خراسان جنوبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌ شناسی، دانشکده علوم، دانشگاه بیرجند، بیرجند، ایران

2 گروه زمین‌شناسی، دانشکده علوم، دانشگاه بیرجند، بیرجند، ایران

چکیده

اسکارن آهن کلاته‌شب در 105 کیلومتری شرق سربیشه (جنوب‌شرق بیرجند) در استان خراسان جنوبی، در شرق ایران واقع‌شده است. یک ماگما با ترکیب حدواسط به درون سنگ­ های آهکی با سن پالئوسن-‌ائوسن نفوذ کرده و باعث تشکیل اسکارن آهن کلاته‌شب شده است. سنگ­ های نفوذی و نیمه ­نفوذی مولد اسکارن شامل: دیوریت، کوارتز دیوریت، کوارتز دیوریت پورفیری و دیوریت پورفیری هستند. اسکارن آهن کلاته‌شب به‌صورت اگزواسکارن رخ‌داده و کانی­ های پیروکسن، گارنت، ایدوکراز، اپیدوت و مگنتیت را تشکیل‌داده است. بر اساس آنالیزهای الکترون مایکروپروب1 و پراش پرتو مجهول2، پیروکسن­ ها از نوع دیوپسید و گارنت ­ها از نوع آندرادیت هستند. بررسی­ های ژئوترمومتری بر مبنای بررسی‌های سیالات درگیر در محدوده اسکارن، بیانگر رخداد واکنش­ های دگرگونی در حضور سیالی با دمای 171 تا 286 درجه سانتی ­گراد و شوری (معادل NaCl) 81/11 تا 77/14 درصد وزنی است.

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