بررسی کانی‌شناسی و زمین‌شیمی معدن بنتونیت چاه گلستان سرایان، خراسان جنوبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس ارشد زمین شناسی اقتصادی دانشگاه تهران

2 استادیار زمین شناسی اقتصادی دانشگاه تهران

3 استادیار رسوب شناسی دانشگاه تهران

چکیده

      معدن بنتونیت چاه گلستان در شهرستان سرایان خراسان جنوبی قرار دارد. در این پژوهش با استفاده از مطالعات کانی­شناسی و زمین­شیمیایی شرایط تشکیل و زایش این معدن مورد بررسی قرار گرفت. روشهای تجزیه ای شامل تجزیه پراش پرتو X (XRD ) و تجزیه شیمیایی (XRF و ICP- MS) بنتونیتها و سنگ دورنگیرشان می شود. کانی اصلی بنتونیت در این معدن، مونت­موریلونیت سدیمی است. همچنین کانیهایی مانند آلبیت، کریستوبالیت، کلسیت، کوارتز، هالیت و ارتوکلاز نیز حضور دارند. بر اساس داده های زمین­شیمیایی ماگمای مادر ریولیتی، سری ماگمایی به وجود آورنده بنتونیتها، آهکی _ قلیایی و محیط زمین ساختی کمان آتشفشانی همزمان با برخورد صفحات است. این معدن در یک فرآیند دیاژنتیکی بوسیله دگرسانی شیشه آتشفشانی در یک لاگون بوجود آمده است. برخی از شواهد موجود شامل چینه کران بودن کانیها، مقدار بالای مونت­موریلونیت، حضور لایه های ژیپس که به صورت بین لایه ایی با بنتونیت وجود دارند، فقدان دگرسانی هیدروترمال و .... می شود.
 

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