کانی‌شناسی و شیمی مگنتیت در کانسار آهن شهرک، ناحیه فلززایی تکاب: گستره‌های کورکورا 2 و شهرک 2

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه ژئوشیمی، دانشکده علوم زمین، دانشگاه خوارزمی، ایران

2 مرکز تحقیقات فراوری مواد معدنی ایران

چکیده

کانسار آهن کورکورا 2 و شهرک 2 از کانسارهای گستره اسکارنی شهرک هستند که در پهنه تکاب قرار دارند. جایگیری توده‌های نفوذی دیوریتی تا گرانودیوریتی و کوارتزدیوریتی در سنگ‌های آتشفشانی و کربناتی، موجب دگرگونی همبری و اسکارن‌زایی آهن شده است. مگنتیت توده‌ای کانه اکسیدی غالب در اسکارن آهن کورکورا 2 و شهرک 2 است. کانی‌های باطله اسکارنی به ترتیب فراوانی، شامل فلوگوپیت، کلسیت، کانی­های رسی، اکتینولیت و کلریت هستند. پیریت و به مقدار کمتر پیروتیت کانه‌های سولفیدی اصلی در کانسارهای مورد بررسی را تشکیل می‌دهند. بررسی شیمی کانی مگنتیت در کانسارهای کورکورا 2 و شهرک 2 نشان داد که این مگنتیت­ها در گستره گرمابی و اسکارن قرار دارند. این بررسی همچنین، نقش فرآیندهای گرمابی و نسبت بالای سیال/سنگ در کانه‌زایی مگنتیت کورکورا 2 و شهرک 2 را در مقایسه با کورکورا 1 و سراب 3 نشان می‌دهد. شواهد کانی‌شناسی و زمین شیمیایی کانسنگ، گویای خاستگاه اسکارنی کانه‌زایی آهن در کانسار کورکورا 2 و شهرک 2 هستند.

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy and magnetite chemistry of Shahrak iron deposit, Tekab metallogenic area: Kurkora 2 and Shahrak 2 districts

نویسندگان [English]

  • Majid Ghasemi Siani 1
  • Amir Panahi 1
  • Hamed Ebrahimi Fard 1
  • Behrouz Karimi Shahraki 2
1 Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University, Iran
2 Iranian Mineral Processing Research Center, Karaj, Iran
چکیده [English]

Kurkora 2 and Shahrak 2 iron deposits are among the deposits of the Shahrak skarn area, which is located in the Takab zone. The emplacement of dioritic to granodioritic and quartzdioritic intrusive bodies in volcanic and carbonate rocks has caused contact metamorphism and iron skarnification. Massive magnetite is the dominant oxide ore in Kurkora 2 and Shahrak 2 iron skarn. The gangue skarn minerals, in order of abundance, include phlogopite, calcite, clay minerals, actinolite, and chlorite. Pyrite and to a lesser extent pyrrhotite are the principal sulfide minerals in the studied deposits. Mineral chemistry studies of magnetite in Kurkora 2 and Shahrak 2 deposits showed that these magnetites are located in the range of hydrothermal and skarn. Magnetite chemistry studies show the role of hydrothermal processes and high fluid/rock ratio in the magnetite mineralization of Kurkora 2 and Shahrak 2 compared to Kurkora 1 and Sarab 3. The mineralogy and geochemical evidences of the ore is proof of the skarn origin of iron ore formation in Kurkora 2 and Shahrak 2 deposits.

کلیدواژه‌ها [English]

  • Mineral chemistry
  • Mineralization
  • Skarn
  • magnetite
  • Shahrak
  • Kurkora
  • Tekab zone

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  • تاریخ دریافت: 09 تیر 1403
  • تاریخ بازنگری: 12 خرداد 1403
  • تاریخ پذیرش: 15 مرداد 1403

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