عوامل کنترل‌ کننده تبلور تورمالین‌ توده گرانیت- گنایس میلونیتی شمال‌ شرق معدن ژان (استان لرستان)

زمین شناسی اقتصادی

مقاله 3، دوره 8، شماره 2 - شماره پیاپی 15، بهمن 1395، صفحه 343-358   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v8i2.45459

نویسندگان

آرزو مرادی^* ؛ ناهید شبانیان بروجنی؛ علیرضا داودیان دهکردی

شهرکرد

چکیده

نتایج آنالیز به روش LA-ICP-MS تورمالین های موجود در توده گرانیت- گنایس میلونیتی A-type شمال شرق معدن ژان در پهنه سنندج- سیرجان به سن انتهای پرکامبرین، بیان‌کننده تبلور کانی تورمالین از این مذاب گرانیتی با پیشرفت روند تفریق است. از طرفی، در نمودار عنکبوتی به‌هنجار شده نسبت به میانگین ترکیب گرانیت- گنایس میلونیتی شامل تورمالین های مورد بررسی هم ناهنجاری مثبت و هم ناهنجاری منفی در Eu را می‌بینیم که بیانگر آن است که دانه های تورمالین غالباً توسط دانه های کوارتز و فلدسپار احاطه شده اند. با توجه به شواهد پتروگرافی، هرجا تورمالین در خمیره غالب وجود دارد، بیوتیت و آلانیت به‌صورت محدود هستند و یا اصلاً وجود ندارند. با استفاده از نمودارهای فاز ترکیبی (بیوتیت، تورمالین و مسکویت)، مشخص شد هم‌پوشانی بین تورمالین و بیوتیت های موجود در این گرانیت- گنایس میلونیتی وجود ندارد، که نشان دهنده واکنش ناسازگار بین بیوتیت و تورمالین در این سیستم گرانیت-گنایس میلونیتی است.

کلیدواژه‌ها

تورمالین؛ روند تفریق؛ نمودار فاز؛ معدن ژان؛ زون سنندج- سیرجان

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