کانی شناسی، زمین شیمی و الگوی تشکیل ذخیره مس پرداد با نگرشی ویژه بر بررسی‌های ایزوتوپی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

چکیده

ذخیره مس پرداد به عنوان بخشی از نوار ماگمایی ائوسن داورزن - عباس آباد، در لبه شمال شرقی پهنه ساختاری ایران مرکزی واقع است. کانی­سازی مس در منطقه به صورت رگه-رگچه­ای، پرکننده فضاهای خالی، دانه پراکنده، جانشینی و به حالت داربستی (برش­های گرمابی)، بیشتر در سنگ­های آتشفشانی شامل بورنیت، کالکوسیت، کالکوپیریت، کوولیت، مالاکیت، آزوریت و مس طبیعی (به مقدار کم) صورت گرفته است. سنگ میزبان از مناطق قوس­های آتشفشانی با ترکیب آهکی قلیایی بوده و با غنی­شدگی از عناصر سنگ دوست درشت یون (LILE: Cs, Rb, K, Sr)، نسبت به عناصر با شدت میدان بالا (HFSE: Nb, Ti, Y, Ce, Zr)، و عناصر خاکی نادر سبک (LREE) نسبت به عناصر خاکی نادر سنگین (HREE) مشخص می­شود. مقادیر منفی 34S δ (بین 1/10- تا 7/12- در هزار) نمونه­های کالکوسیت، بیانگر فرآیند احیایی باکتریایی است. ایزوتوپ­های کربن 13Cδ اندازه­گیری شده در کلسیت­های همراه با کانه­زایی دارای مقادیر منفی 06/9- تا 57/9- هستند. ذخیره مس پرداد براساس ویژگی­های کانی­شناسی، سنگ­شناسی، ساخت و بافت ماده معدنی، همبرزادی کانیایی و داده­های برآمده از بررسی ایزوتوپ پایدار، شبیه ذخایر نوع مانتو در شیلی در نظر گرفته می­شود.    

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy, geochemistry and genetic model of Pardad copper deposit constrains on isotopic studies

نویسندگان [English]

  • Saeid Moshtagh
  • kamal Siahcheshm
  • Mohammad Reza Hosseinzadeh
Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
چکیده [English]

The Pardad copper deposit is situated within the Eocene Davarzan-Abbassabad magmatic belt, along the northeastern margin of the Central Iran structural zone. Copper mineralization occurs as veinlets, open space fillings, disseminations, replacements and stockwork (hydrothermal breccia), primarily in volcanic rocks, including bornite, chalcocite, chalcopyrite, covellite, malachite, azurite, and native copper (minor). The host rocks belong to calc-alkaline volcanic arcs and are characterized by enrichment in large-ion lithophile elements (LILE: Cs, Rb, K, Sr), relative to high-field strength elements (HFSE: Nb, Ti, Y, Ce, Zr), and light rare earth elements (LREE) relative to heavy rare earth elements (HREE). Negative δ34S values (-1.10‰ to -7.12‰) of chalcocite samples indicate a bacterial reduction process. Measured δ13C values of calcite associated with mineralization ranges from -9.06‰ to -57.9‰. Based on mineralogical, lithological, structural, and textural characteristics of the ore material, mineral paragenesis, and stable isotope data, the Pardad copper deposit is classified as a Manto-type deposit similar to those in Chile.

کلیدواژه‌ها [English]

  • Pardad copper deposit
  • Davarzan-Abbassabad magmatic belt
  • Manto-type deposit
  • δ34S
  • δ13C
  • bacterial reduction
  • LILE
  • HFSE
  • genetic model

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  • تاریخ دریافت: 23 خرداد 1403
  • تاریخ بازنگری: 14 تیر 1403
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