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Jafari A, Karimpour M H, Mazaheri S A, Malekzadeh Shafaroudi A, Ren M. Mineral chemistry and thermometry of chlorites in mineralization zones and metamorphic rocks from Golgohar iron ore deposit (No. 1), Sirjan, Kerman. www.ijcm.ir 2019; 26 (4) :799-812
URL: http://ijcm.ir/article-1-1189-fa.html
URL: http://ijcm.ir/article-1-1189-fa.html
جعفری افسانه، کریم‌پور محمدحسن، مظاهری سید احمد، ملک‌زاده شفارودی آزاده، رن مینغوآ. شیمی و دماسنجی کلریت در پهنه‌های کانیسازی و سنگ‌های دگرگونی معدن سنگ آهن گل‌گهر (شماره 1)، سیرجان، کرمان. مجله بلورشناسی و کانی شناسی ایران. 1397; 26 (4) :799-812
1- دانشگاه فردوسی مشهد
2- دانشگاه نوادا
2- دانشگاه نوادا
چکیده: (4402 مشاهده)
مجموعه معدنی گل‌گهر در 55 کیلومتری جنوب‌غرب سیرجان در پهنه دگرگونی سنندج- سیرجان واقع است. بر اساس مجموعه کانی‌های همراه با مگنتیت، 5 پهنه کانیسازی تشخیص داده شد. کانی‌های باطله شامل پیریت، پیروتیت، کالکوپیریت، سیدریت، آپاتیت، سرپنتین، طلق، کلریت، آمفیبول، کلسیت، دولومیت و کوارتز است. همه کلریت‌ها از نوع سههشتوجهی (کلینوکلر- شاموزیت) هستند. کلریت‌های پهنه مگنتیت+پیریت+پیروتیت+کالکوپیریت (MPPC) و پهنه مگنتیت+تالک+کلریت+آمفیبول (MTCA) به‌ترتیب پننین و پننین- کلینوکلر هستند. کلریت‌های موجود درکلریت شیست‌ها گستره ترکیبی گستردهتری از پننین، کلینوکلر، پیکنوکلریت تا رپیدولیت را نشان می‌دهند. کلریت در میکا شیست‌ها و آمفیبولیت از نوع رپیدولیت هستند. کلریت‌هایی که مستقیم از سیال کانه‌ساز تشکیل می‌شوند بیشترین مقدار Mg را دارند. با کاهش نسبت سیال به سنگ، Mg کاهش و Fe و AlIV افزایش می‌یابند. افزایش نسبت Mg/(Mg+Fe) از سنگ‌های میزبان به سمت پهنه کانیسازی متفاوت با کلریت سازند آهن است. مقدار عناصر فرعی در ساختار کلریت به ترکیب سیال، سایر کانی‌های متبلور شده از سیال، نسبت واکنش سنگ/آب و ترکیب سنگ میزبان وابسته است. گستره دمایی تشکیل کلریت از °C245 تا °C415 متغیر است (گستره دمایی شیست سبز). پهنه کانیسازی MPPC با دمای متوسط °C301 کمترین دمای تشکیل را داراست، بنابراین کلریت های غنی از منیزیم در دمای کمتری نسبت به کلریت‌های غنی از آهن تشکیل شده‌اند.
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