بررسی زمین‌شیمی و کانه‌زایی آهن و آپاتیت برای شناخت عناصر خاکی نادر در کانسار گزستان منطقه بافق (استان یزد)

نویسندگان

دانشگاه یزد

چکیده

کانسار گزستان در 185 کیلومتری یزد در کمربند فلززایی بافق – پشت بادام  از سنگ‌های کربناتی، شیل، توف، ماسه‌سنگ و سنگ‌های آتشفشانی مربوط به دوره اینفراکامبرین تشکیل شده است. سنگ‌های سبز با ترکیب اسیدی تا بازی (ریولیت، داسیت تا بازالت) میزبان کانی‌سازی آهن - فسفات هستند. دگرسانی در سنگ‌های آتشفشانی، شدید و شامل دگرسانی‌های اکتینولیت، کلریتی، سیلیسی و آرژیلی است. همچنین سنگ میزبان شدیدتر دچار دگرسانی شده است. کانی‌سازی شامل اکسیدهای آهن – آپاتیت است که با کمی کوارتز، پیریت و کلسیت همراهی می‌شود. کانه‌زایی مگنتیت و آپاتیت به شکل‌های مگنتیت – آپاتیت در سنگ میزبان دگرسان شده، مگنتیت – آپاتیت پیریت‌دار، مگنتیت سیلیس‌دار، هماتیت و مگنتیت هماتیتی شده قابل تفکیک است. همچنین نسبت بالای عناصر خاکی نادر سبک به سنگین (LREE/HREE) همراه با ناهنجاری منفیEu  می‌تواند نشانگر خاستگاه ماگمایی این الگو باشد.  کانسار آهن گزستان مشابه با کانسار کایرونای سوئد است.     

کلیدواژه‌ها

عنوان مقاله [English]

Study of apatite and iron geochemistry and mineralization for identification of the rare earth elements deposit, Gazestan in Bafgh region (Yazd Province)

نویسندگان [English]

  • AliAkbar Dehganzadeh Bafghi
  • AmirHosain Kohsary
  • Farhad Mohhamad Torab
Yazd University
چکیده [English]

Gazestan deposit is located about 185 km of Yazd, in the Bafgh – Posht e Badam Metallogenic belt, consists of Infracambrian carbonate, shale, tuff, sandstone and volcanic rocks. Acid to basic green rocks (rhyolite, dacite and basalt) are host for iron and phosphate mineralization. The alteration process is more intence in the volcanic rocks including, actinolite, chloritization, silicification and argilic. Also the host rocks altered strongly. Mineralization contains iron oxides and apatite associated with a minor amount of quartz, pyrite and calcite. The form of magnetite - apatite in the altered host rocks, magnetite - pyrite apatite, silica bearing magnetite, hematite and hematite magnetite ores. Also high LREE / HREE ratio and Eu negative anomaly could be indicative of a magmatic source. Therefore, origin of the Gazestan iron ore deposit is similar to Sweden Kiruna type.

کلیدواژه‌ها [English]

  • iron and apatite
  • rare earth elements
  • Bafgh Gazestan
  • Bafgh – Posht e Badam metallogenic belt

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  • تاریخ دریافت: 11 تیر 1404
  • تاریخ بازنگری: 15 بهمن 1404
  • تاریخ پذیرش: 11 تیر 1404

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