شیمی کانی مگنتیت و مشخصه‌های میانبارهای سیال در کانسار آهن کوه‌بابا، جنوب هشترود، شمال غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه ارومیه

2 دانشگاه صنعتی ارومیه

3 دانشگاه تبریز

چکیده

کانسار آهن کوه­بابا در 70 کیلومتری جنوب شهر هشترود، استان آذربایجان شرقی، شمال غرب ایران واقع است. این کانسار، از نظر زایشی وابسته به توده­های نفوذی گابرویی تا دیوریتی است. گابرو- نوریت و پیروکسن هورنبلند گابرو- نوریت سنگ میزبان اصلی کانی­سازی آهن هستند. دگرسانی­های گسترده همراه با کانی­سازی شامل پهنه­های اکتینولیتی، کلریتی و اپیدوتی است. کانه عمده مگنتیت همراه با مقادیر اندک آپاتیت بوده که به صورت بافت­های توده­ای، رگه-رگچه­ای، جانشینی، برشی و­ پراکنده است. نتایج تجزیه ریزپردازش الکترونی (EPMA) برای 28 نقطه از بلورهای مگنتیت نشان از مقادیر نسبتاً بالای عناصری چون Al، Mn، Ti و V  دارد. مقادیر اجزایی مثل TiO2، V2O3، NiO و MgO در مگنتیت­های با بافت توده­ای بالاتر از مگنتیت­های با بافت پراکنده و رگچه­ای است. بررسی میانبارهای سیال اولیه در بلورهای کوارتز همزمان با کانی­سازی با مگنتیت نشان می­دهد که میانبارهای سیال به طور عمده از نوع دو فازی (L+V) و گاهی تک­ فاز گازی هستند. دمای همگن­شدگی سیال­های دو فازی (L+V) در گستره 436 تا 544 (میانگین 505) درجه سانتی­گراد است. بر پایه دماهای نقطه ذوب­نهایی یخ، متوسط شوری 82/15 درصد وزنی معادل نمک طعام به دست آمد. با توجه به پارامترهای اندازه­گیری شده چون دمای همگن­شدگی، شوری، چگالی و فشار میانبارهای سیال، عمق کانه­سازی مگنتیت در گستره 3/1 تا 7/2 (میانگین 3/2) کیلومتر (بر پایه فشار همه جانبه) برآورد شد. بر اساس یافته­های EPMA و میانبارهای سیال، کانسنگ­های آهن کوه­بابا را می­توان کانسارهای آهن نوع کایرونا و در زیر رده اکسید آهن- آپاتیت ضعیف رده­بندی کرد و خاستگاه مگنتیت را می­توان  ماگمایی- گرمابی دما بالا در نظر گرفت.    

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry of magnetite and fluid inclusions studies in the Kuh-Baba iron deposit, south of Hashtroud, NW Iran

نویسندگان [English]

  • Majid Hafez Darbani 1
  • Ali Abedini 1
  • Farhang Aliyari 2
  • AliAsghar Calagari 3
1 Urmia University
2 Urmia University of Technology
3 University of Tabriz
چکیده [English]

The Kuh-Baba iron ore deposit is located about 70 km south of Hashtroud, East-Azarbaidjan Province, NW Iran. The deposit is genetically affiliated with intrusive bodies of gabbroic to dioritic composition. The principal host rocks for the Fe mineralization include units of gabbro-norite and pyroxene hornblende gabbro-norite. The widespread alteration zones which are accompanied with Fe-mineralization are actinolitization, chloritization and epidotization. The principal ore mineral is magnetite with subordinate apatite showing massive, vein/veinlet, replacement, brecciated, and disseminated textures. The results of electron probe micro-analysis (EPMA) on 28 points of magnetite crystals show relatively high amounts of elements such as Al, Mn, Ti, and V. The values of components such as TiO2, V2O3, NiO and MgO in massive magnetites are higher than those present in disseminated and veinlet-type magnetites. Studies of primary fluid inclusions in quartz crystals coexisting with magnetite mineralization show that they are mainly liquid-rich 2-phase (L+V) and occasionally monophase-vapor (V). The homogenization temperatures of liquid-rich 2-phase inclusions range from 436ºC to 544ºC (average of 505ºC). Based on temperatures of the last melting point of ice (TM), the obtained average salinity is 15.82 wt% NaCl equ. Considering the measured parameters such as homogenization temperature, salinity, density, and pressure of the fluid inclusion, the depths of magnetite mineralization were estimated to be within the range of 1.3-2.7 (average of 2.3) km (based on the lithostatic pressure). According to the EPMA and fluid inclusion data, the Kuh-Baba iron ores deposit can be classified as a ‘Kiruna-type’ and subtype Iron-Oxide apatite-poor deposits and the origin of magnetite can be conceived as both magmatic and high-temperature hydrothermal.  

کلیدواژه‌ها [English]

  • Mineral chemistry of magnetite
  • study of fluid inclusions
  • Kuh-Baba
  • Hashtroud
  • Iran

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  • تاریخ دریافت: 20 آبان 1397
  • تاریخ بازنگری: 03 بهمن 1397
  • تاریخ پذیرش: 04 اسفند 1397

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