شیمی مگنتیت: شاهدی بر کانه‌زایی اسکارن آهن در رشته کوه آهنگران، شرق ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد

2 گروه زمین شناسی و مهندسی نفت، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران

چکیده

منطقه معدنی مورد بررسی در شمال شرق قطعه لوت و در رشته کوه آهنگران واقع است. واحدهای سنگی منطقه اغلب شامل واحدهای آهکی و سنگ‌های کربناتی دگرگون شده هستند که توده‌های نفوذی با ترکیب دیوریت، مونزودیوریت، گرانودیوریت و گرانیت در آنها نفوذ نموده‌اند. بر اساس کنترل ساختاری پهنه کانی‌سازی و تشکیل جانشینی دگرنهادی با حضور کانی‌های آبدار دما پایین چون کلریت و اپیدوت همراه با مگنتیت، می‌توان کانه‌زایی آهن منطقه را از نوع اسکارن دما پایین دانست. شیمی کانی مگنتیت و مقادیر Ca، Ti، Al، V، Cr، Ni و Mn نیز شاهدی بر شکل‌گیری ذخایر اسکارن در منطقه هستند. بررسی­های صحرایی نشان دارند که خاستگاه کانی‌سازی آهن منطقه معدنی، توده نفوذی جوانتر دیگری در عمق است. براساس تحلیل مؤلفه‌های محاسبه شده بر پایه عناصر خاکی نادر (REE)، محلول کانه‌دار با خاستگاه ماگمایی از طریق گسل‌ها به بالا راه یافته و پس از آمیختگی با سیال­های جوی، در نتیجه واکنش با سنگ‌های کربناتی، کانسنگ آهن را ایجاد نموده است.    

کلیدواژه‌ها

عنوان مقاله [English]

Magnetite Chemistry: Evidence of Skarn Fe Mineralization in the Ahangaran Range, Eastern Iran

نویسندگان [English]

  • Maryam Sadat Mazhari 1
  • Saeed Saadat 2
  • Seyed Ahmad Mazaheri 1
  • Seyed Masoud Homam 1
1 Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
2 Department of Petroleum Engineering and Geology, Mashhad Branch, Islamic Azad University, Mashhad, Iran
چکیده [English]

The studied mining area is located in the northeast of the Lut block, within the Ahangaran mountain range. The rock units in the region generally include limestone and metamorphosed carbonate rocks that are penetrated by intrusive masses with the composition of diorite, monzodiorite, granodiorite and granite. Based on the structural control of the mineralization zone and the formation of metasomatism succession with the presence of low-temperature hydrous minerals such as chlorite and epidote along with magnetite, the iron mineralization of the area can be considered as a low-temperature skarn type. The mineral chemistry of magnetite and the amounts of Ca, Ti, Al, V, Cr, Ni and Mn are also similar to skarn deposits. Field studies indicate that another younger intrusive mass at depth is the origin of the iron mineralization of the ore zone. Based on analysis of components, calculated on the basis of REE, the ore solution with magmatic origin has moved upward along the faults and after mixing with atmospheric fluids, as a result, it has created a reaction with the carbonate rocks of the iron ore.

کلیدواژه‌ها [English]

  • magnetite chemistry
  • Iron mineralization
  • low temperature skarn
  • Ahangaran
  • Lut

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  • تاریخ دریافت: 14 آذر 1401
  • تاریخ بازنگری: 09 دی 1401
  • تاریخ پذیرش: 12 بهمن 1401

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