دوره 27، شماره 2 - ( 4-1398 )
جلد 27 شماره 2 صفحات 400-385 |
برگشت به فهرست نسخه ها
1- دانشگاه آزاد اسلامی
چکیده: (2576 مشاهده)
ناحیه ملاطالب در شمال شهرستان الیگودرز و در پهنه دگرگونه سنندج-سیرجان قرار دارد. قدیمی‌ترین نهشته‌های موجود شامل توالی نسبتاً یکنواخت اسلیت و شیست با رگه و رگچه‌های سیلیسی به همراه هورنفلس‌های سیاه رنگ و ماسه‌سنگ‌های دگرگون‌شده است. پیدایش و نفوذ توده‌های گرانیتوئیدی ناحیه الیگودرز در زمان ژوراسیک میانی در درون شیست‌ها مهمترین رخداد زمین‌شناسی در این ناحیه است. تجزیه به روش ریزپردازش الکترونی (نقطه‌ای) از تورمالینهای موجود در پگماتیت‌ها، رگه‌های آپلیتی-پگماتیتی تورمالین‌دار، تورمالینهای گرهکی و رگه‌های کوارتز-تورمالین نشان می‌دهد که همه تورمالینها در گستره بین شورل-فوئیتیت با تمرکز بیشتر در منطقه شورلیت قرار گرفته‌اند. رخدادهای متعدد و فراوان تورمالین در واحد گرانیتی، خودشکلی و عدم وجود پهنه‌بندی شیمیائی، بالا بودن مقدار Al و Fe/Fe+Mg، و همچنین تهیجای X در تورمالینها قابل مشاهده بوده و بیانگر ماگمایی بودن آنهاست. بنابراین تورمالینهای مورد بررسی وابسته به محیط‌های گرانیتی بوده و بوسیله یک سیال گرمابی با خاستگاه ماگمایی بوجود آمده‌اند.
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