زمین‌شناسی، زمین شیمی و کانی‌شناسی در پهنه‌‌های دگرسانی و ماده معدنی در منطقه اکتشافی مس کلاته برق، شمال غرب بردسکن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

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

3 گروه زمین‌شناسی، دانشگاه پیام نور مشهد، مشهد، ایران

چکیده

منطقه اکتشافی مس کلاته برق در شمال‌غربی بردسکن، استان خراسان رضوی واقع است. واحدهای سنگی در منطقه مورد بررسی شامل توالی از سنگ­های آتشفشانی ائوسن با طیف ترکیبی بازالت و سپس تراکی آندزیت و آندزیت است. روی این مجموعه، واحد کنگلومرایی قرار دارد که قطعه­های آن بیشتر از سنگ­های آتشفشانی تشکیل شده­اند. تخلخل بالای کنگلومرا به عنوان سنگ میزبان محیط مناسبی برای تشکیل کانسارهای مس مانتو را در این پنجره فراهم کرده و کانی­سازی در افق ویژه­ای واحد کنگلومرایی رخ داده است. کانی­شناسی ماده معدنی شامل کانی‌های اولیه کالکوزیت و کمی بورنیت است و کانی‌های ثانویه نیز مالاکیت و کوولیت هستند که از این میان، کالکوزیت مهمترین کانی سولفیدی در منطقه به حساب می­آید. ساخت و بافت ماده معدنی بصورت رگچه‌ای، پرکننده­، پراکنده و جانشینی است. کانی­شناسی دگرسانی در ارتباط با کانه­زایی کلریت و کلسیت است. بی‌هنجاری زمین شیمی مس در نمونه‌های سطحی 4/1 درصد است. وجود کالکوزیت، نبود یا مقدار کم کانی­های سولفیدی آهن­دار، حضور کلریت و کلسیت به عنوان کانی باطله اصلی و نبود کوارتز نشان دهنده یک محلول کانه‌دار احیایی و فقیر از آهن و سیلیس است. شواهد سنگ­شناسی، دگرسانی، کانی­شناسی و زمین­شیمی منطقه اکتشافی کلاته برق شبیه به ذخایر مس مانتو است.

کلیدواژه‌ها

عنوان مقاله [English]

Geology, geochemistry and mineralogy of alteration zone and mineral occurrence in Kalateh Bargh copper prospect area, northwest of Bardaskan

نویسندگان [English]

  • mohadese Ebrahimi 1
  • , Mohammad Hassan Karimpour 2
  • Alireza Mazloumi Bejstani3 3
1 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
2 Department of Geology and Research Center for Ore Deposit of Eastern Iran, Faculty of Science, Ferdowsi University of Mashhad, Mashhad
3 Department of Geology, Payam Noor University of Mashhad, Mashhad, Iran
چکیده [English]

The Kalateh Bargh prospect area is located NW of Bardaskan, Khorasan Razavi province. Geology of the erea includes sequence of Eocene volcanic rocks with basalt composition and trachyandesite and andesite. On this sequence, there is a conglomerate unit that its fragments are mainly composed of volcanic rocks. The high porosity of the conglomerate as the host rock provided a suitable space for the formation of Manto copper deposits. Mineralization has formed in conglomerate unit as a particular horizon in the Kalate Barq area. Primary minerals include chalcocite and minor bornite and secondary minerals consist of malachite and covellite. Structure and texture of mineralization are veinlet, open-space filling, disseminated and replacement. Mineralogy of alteration zones is related to mineralization and consist of chlorite and calcite. The average copper geochemical anomaly in surface samples is 1.4 %. The presence of chalcocite and absence or low amount of iron sulfide minerals, the presence of chlorite and calcite as the main gangue minerals and lack of quartz indicate that ore solution is reduced and poor of iron and silica. Based on lithology, alteration, mineralogy and geochemistry of Kalateh Bargh prospect area is similar to manto-type copper deposits.

کلیدواژه‌ها [English]

  • mineralogy
  • Chalcocite
  • conglomerate
  • Geochemistry
  • stratabound
  • manto-type copper
  • Bardaskan

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  • تاریخ دریافت: 28 مرداد 1402
  • تاریخ بازنگری: 16 مهر 1402
  • تاریخ پذیرش: 15 آبان 1402

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