کانی‌شناسی، شیمی کانه‌ها و بررسی سیال‌های درگیر در کانسار سرب و روی گوشفیل، ناحیه معدنی ایرانکوه، جنوب غرب اصفهان

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه فردوسی مشهد

چکیده

کانسار گوشفیل در جنوب غرب اصفهان و در پهنه فلززایی ملایر- اصفهان واقع شده است. کانی­سازی به شکل دیرزادی در مرز شیل­های ژوراسیک و دولومیت کرتاسه تشکیل شده است و کنترل ساختاری دارد. همبرزایی کانیایی شامل اسفالریت، گالن و پیریت است که با کانی­های باطله­ دولومیت، کوارتز، مواد آلی و کمتر باریت همراهی می­شود. این کانی­ها در قالب بافت­های برشی، رگچه­ای، پرکننده فضای خالی و پراکنده دیده می­شوند. دولومیتی­شدن و سیلیسی­شدن مهمترین دگرسانی­ها هستند. شیمی کانه­ها نشان می­دهد که گالن­ها غنی از نقره و آنتیموان و فقیر از بیسموت هستند. نسبت Sb/Bi در کانی گالن بیش از 14 است که شاخصه کانسارهای دما پایین است. اسفالریت­ها غنی از آهن و کادمیوم هستند. برپایه بررسی سیالات درگیر، دمای تشکیل کانسار گوشفیل بین 223 تا 302 درجه سانتیگراد بوده و از محلولی شامل نمک­های CaCl2 و NaCl با درجه شوری بین 5/9 تا 7/16 درصد به وجود آمده است. نوع سنگ میزبان، چینه­کران و دیرزاد بودن کامل کانسار و کنترل کانی­سازی توسط گسل­های پس از رسوبگذاری، بافت، نوع کانه­ها و باطله­های همراه و عدم وجود فعالیت­های آذرین در منطقه نشان می­دهد که کانسار گوشفیل شباهت زیادی با ذخایر نوع دره می سی سی پی (MVT) دارد؛ اما دمای محلول کانه­دار نسبت به ذخایر معمولی دنیا بالاتر است.    

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy, ore chemistry, and fluid inclusion studies in Gushfil Pb-Zn deposit, Irankuh mining district, SW Isfahan

نویسندگان [English]

  • Monir Saboori
  • mohammad hasan Karimpour
  • Azadeh Malekzadeh Shafaroudi
Ferdowsi University of Mashhad
چکیده [English]

Gushfil deposit is located SW Isfahan within Malayer-Isfahan Metallogenic Zone. Mineralization occurs at contact of Jurassic shale and Cretaceous dolomite as epigenetic with structural control. Paragenetic minerals are sphalerite, galena, and pyrite associated with dolomite, quartz, organic matter, and minor barite as gangue minerals. These minerals show berrecia, veinlets, open space filling, and dessiminated textures. Dolomitization and silicification are the most important alteration zones. Ore chemistry indicates galena is Ag and Sb-rich and Bi-poor. Sb/Bi ratio in galena is up to 14, which is indicator of low temperature deposits. Sphalerites are Fe and Cd-rich type. Based on fluid inclusion studies, formation temperature of Gushfil deposit is 223 to 302ºC. It is formed by NaCl and CaCl2-bearing fluid with 9.5 to 16.7 wt. % salinity. Host rock type, stratabound and epigenetic mineralization, post- sedimentary fault controlling, texture, ore types and gangue minerals, and no associated with igneous activity indicate Gushfil deposit is similar to MVT deposits, but ore-fluid temperature is higher than typical mineralization in the world.   

کلیدواژه‌ها [English]

  • mineralogy
  • Mineral chemistry
  • fluid Inclusion
  • MVT type
  • Gushfil
  • Irankuh

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  • تاریخ دریافت: 22 اردیبهشت 1396
  • تاریخ بازنگری: 07 بهمن 1396
  • تاریخ پذیرش: 20 اسفند 1396

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