زمین‌شناسی، کانی‌سازی، زمین‌شیمی و بررسی سیال‌های درگیر در رخداد معدنی مس کیمیا، شمال‌غرب بردسکن، استان خراسان رضوی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی و گروه پژوهشی اکتشاف ذخایر معدنی شرق ایران، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

2 گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی‌مشهد، مشهد، ایران

چکیده

منطقه مس کیمیا در مجموعه آتشفشانی-رسوبی ائوسن شمال‌غرب بردسکن در استان خراسان‌رضوی قرار دارد. زمین‌شناسی منطقه شامل سنگ­های آتشفشانی با ترکیب آندزیتی-بازالتی، کنگلومرا با قطعه­های آندزیتی، سنگ­آهک نومولیت‌دار و ماسه­سنگ توفی است. کانی‌سازی در واحدهای آندزیتی و کنگلومرا و همچنین در مرز بین این واحدها به شکل رگچه، پرکننده حفره­ها، و جانشینی و پراکنده دیده می‌شود. کانی‌های اولیه کالکوزیت، پیریت و کانی‌های ثانویه مالاکیت، کوولیت و اکسیدآهن هستند. گسل‌های منطقه در دو راستای شمال‌شرقی-جنوب غربی و شمال‌غربی-جنوب‌شرقی با شیب 45 درجه قرار دارند. رگچه‌های اصلی در منطقه کلسیت-کوارتز-پیریت، کلسیت-کالکوزیت و کلسیت-باریت-پیریت هستند. دگرسانی‌های در ارتباط با رگچه، سیلیسی و کربناتی و مربوط به واحدهای آذرین، پروپلیتی، کربناتی و کلریتی هستند. مقدار عنصر مس در منطقه بین 6950 و 47935 گرم بر تن است و سایر عناصر مقدار کمی دارند. براساس بررسی­های سیال­های درگیر، کمترین دمای تشکیل بین 228 تا 368 درجه سانتی­گراد و درجه‌شوری بین 4/10 تا 9/16درصد است. براساس شواهد سنگ میزبان، ساخت و بافت‌ها، کانی‌‌سازی و دگرسانی‌های موجود، کانی‌سازی مس در منطقه مس کیمیا از نوع مانتو است.    

کلیدواژه‌ها

عنوان مقاله [English]

Geology, mineralization, geochemistry and fluid inclusion studies in Kimia copper mineralization, northwest of Bardeskan, Razavi Khorasan Province

نویسندگان [English]

  • Azadeh Malekzadeh Shafaroudi 1
  • Hamed Amini Zahan 2
  • Mohammad Hassan Karimpour 1
1 Research Center for Ore Deposits of Eastern Iran, Ferdowsi University of Mashhad, Iran
2 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

The Kimia copper area is located in the Eocene volcano-sedimentary complex northwest of Bardskan in Razavi Khorasan Province. The geology of the area includes volcanic rocks with andesite-basalt composition, conglomerate with andesite fragments, nummulitic limestone and tuffaceous sandstone. Mineralization is found in andesite and conglomerate units as well as at the border between these units in the form of vein-veinlets, disseminated, replacement and open space filling. Primary minerals are chalcocite, pyrite, and secondary minerals are malachite, caveolite, and iron oxide. The faults in this region are formed in two directions, northeast-southwest and northwest-southeast, with a slope of 45 degrees. The main veins in this zone are calcite-quartz-pyrite, calcite-chalcocite and calcite-barite-pyrite. Alterations related to veins are siliceous and carbonate and are related to igneous, propylitic, carbonate and chloritic units. The amount of copper element ranges between 6950 and 47935 ppm and other elements have low values. Based on fluid inclusion study, the minimum formation temperature ranges between 228 and 368 °C and the salinity is between 10.4 and 16.9 percent. Based on the evidence of the host rock, structure, textures and existing alterations, copper mineralization in Kimia area is Manto type.

کلیدواژه‌ها [English]

  • mineralogy
  • Geochemistry
  • fluid Inclusion
  • Eocene
  • Manto copper

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  • تاریخ دریافت: 02 آذر 1401
  • تاریخ بازنگری: 26 دی 1401
  • تاریخ پذیرش: 01 بهمن 1401

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