کانسار اپی ترمال سولفیداسیون حدواسط مس±طلا رشت آباد (شمال زنجان): شواهد کانه‌زایی، میانبارهای سیال و ایزوتوپ‌های پایدار C-O

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان

چکیده

کانسار مس±طلا رشت‌آباد (شمال زنجان) بخشی از کمربند فلززایی طارم- هشتجین در پهنه البرزغربی- آذربایجان است. واحدهای رخنمون­یافته شامل سنگ­های آتشفشانی و نیمه­عمیق ائوسن با سرشت آهکی-قلیایی تا شوشونیتی هستند که در گستره کمان آتشفشانی قرار دارند. مهمترین دگرسانی‌های در ارتباط با کانه­زایی شامل دگرسانی­های کم دمای سیلیسی و سریسیتی هستند. کانه­­سازی در رگه­های کوارتز-سولفید شامل مجموعه­­‌های اکسیدی (هماتیت)، سولفیدی (کالکوپیریت، کوولیت، بورنیت و گالن)، سولفاتی (باریت) و کربناتی (مالاکیت و آزوریت)، است. داده‌های میانبارهای سیال برای میانبارهای دوفازی مایع+بخار (L+V) اولیه، دمای 138 تا C°320 (متوسطC°229) و شوری 49/2 تا 41/9 (متوسط 95/5) درصد وزنی معادل نمک طعام، نشانگر پدیده آمیختگی هم دما و رقیق­شدگی سیال کانه­ساز هستند. همچنین مقادیر C13δ (21/9-تا ‰ 81/6-) و δ18O (14-تا ‰ 15-) نیز بیانگر عملکرد سیال جوی در شکل­گیری رگه­های کربناتی مرحله تأخیری است. ویژگی‌های اصلی کانسار رشت آباد گویای شباهت این ذخیره با کانسارهای اپی­ترمال سولفیداسیون حدواسط است.    

کلیدواژه‌ها

عنوان مقاله [English]

Intermediate sulfidation epithermal Cu±Au deposit of Rasht‌‌Abad (North of Zanjan): evidence of mineralization, fluid inclusions and C-O stable isotope

نویسندگان [English]

  • Ajalli
  • Torkian
  • Tale Fazel
1Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
چکیده [English]

Rasht Abad Cu±Au deposit is a part of the Tarom-Hashtjin metallogenic belt in the western Alborz-Azerbaijan zone. The exposed units in the area include volcanic, sub-volcanic calc-alkaline to shoshonitic rocks with Upper Eocene age and belongs to magmatic arcs setting. The most important alterations related to mineralization include low temperature silicification and sericitic alterations. Mineralization with quartz-sulfide veins in the area consist of a series of oxide (hematite), sulfide (chalcopyrite, galena, bornite, covelite), sulfate (barite) and carbonate (malachite, azurite). Fluid inclusions measurements on primary two-phase L+V inclusions determined homogenization temperatures between 138 to 320°C (229°C) and salinity between 2.49 to 9.41wt% (9.41) NaCl eq, evidence of isothermal mixing and dilution. The δ13C (-9.21to -6.81‰) and δ18O (-14 to -15‰) also show the influence of meteoric waters in late carbonate veins. The results of this study show that the high similarity between Rasht Abad and intermediate sulfidation epithermal deposits.

کلیدواژه‌ها [English]

  • Dilution
  • polymetallic mineralization
  • fluid Inclusion
  • Tarom-Hashtjin metallogenic belt

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مجله بلورشناسی و کانی شناسی ایران
دوره 29، شماره 1 - شماره پیاپی 81
فروردین 1400
صفحه 207-220

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  • تاریخ دریافت: 24 اسفند 1398
  • تاریخ بازنگری: 02 خرداد 1399
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