دوره 28، شماره 4 - ( 10-1399 )
جلد 28 شماره 4 صفحات 920-907 |
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Zirjanizadeh, Samiee. Evidences of epithermal mineralization at Bidook gold vein deposit (east of Iran), based on geology, alteration, mineralization, geochemistry and thermometery data.. www.ijcm.ir 2020; 28 (4) :907-920
URL: http://ijcm.ir/article-1-1557-fa.html
URL: http://ijcm.ir/article-1-1557-fa.html
زیرجانی زاده صدیقه، سمیعی سمیه. شواهد کانی‌زایی اپیترمال درکانسار طلای رگه‌ای بیدوک (شرق ایران) بر اساس یافته‌های زمین‌شناسی، دگرسانی، کانیسازی، زمین شیمی و دماسنجی. مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (4) :907-920
1- مجتمع آموزش عالی گناباد
چکیده: (1753 مشاهده)
کانسار بیدوک در 10کیلومتری جنوب شرق بجستان، خراسانرضوی و در بخش شمالی پهنه ساختاری قطعه لوت قرار دارد. رخنمونهای سنگی منطقه شامل آندزیت و واحدهای آذرآواری است. دگرسانی در این واحدها شامل پروپیلیتی، سیلیسی و آرژیلی هستند. کانیسازی بصورت رگههای کوارتز - سولفید در سنگهای آندزیتی و آذرآواری تشکیل شدهاند. این رگهها دارای بافت تودهای هستند و پیریت کانی اولیه سولفیدی اصلی بوده که اغلب به اکسیدهای آهن هوازده شده و ظاهری نارنجی تا زرد به رگهها داده است. بررسیهای زمین شیمی سنگی در نواحی دگرسانی و رگههای کانیسازی، ناهنجاری از عناصر طلا ( بین 3 تا 201 میلی گرم در تن و در یک نمونه 1173 میلیگرم در تن ) را نشان داد. بر اساس سیال های موجود در کانی کوارتز، در رگههای کوارتز- سولفید یک نوع سیال درگیر اولیه غنی از مایع شناسایی شد. دماسنجی بر سیال های درگیر اولیه دوفازی (L+V) غنی از مایع در رگه کوارتز- اکسید آهنی، بیانگر تشکیل این نوع کانیسازی در دمای حدود 202 تا 273 درجه سانتیگراد و شوری حدود 76/15 تا 99/19درصد معادل وزنی نمک طعام است. ترکیب سنگ میزبان، کانیشناسی، دمای تشکیل، انواع دگرسانیها و دادههای زمینشیمی منطقه بیدوک مشابه کانسارهای اپیترمال است.
واژه‌های کلیدی: رگههای سیلیسی، طلا، کانسار بیدوک، بجستان.
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