زمین‌شیمی مگنتیت رهیافتی برای تعیین شرایط فیزیکوشیمیایی تشکیل اسکارن آهن علم‎کندی، غرب ماهنشان، استان زنجان

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه تبریز

چکیده

اسکارن علم‎کندی در محل تماس استوک گرانودیوریتی با آهک و دولومیت‎های سازند سلطانیه و با جایگزینی سیلیکات آهکی بدون آب مرحله پیشرونده اسکارنی (گارنت، دیوپسید، ولاستونیت) با مجموعه‌ کانی­های سیلیکات‌های آبدار (سرپانتین، اپیدوت، ترمولیت-اکتینولیت) بهمراه کوارتز و کلسیت پدید آمده است. این رویداد باعث ایجاد عدسی­های مگنتیتی (±هماتیتی و پیریتی) با بافت توده‌ای، نواری، دانه پراکنده و رگه‌ای در لبه توده­ی نفوذی و پهنه برخورد شده است. براساس یافته­های این پژوهش؛ زمین­شیمی عناصر کمیاب مگنتیت، در اثر مراحل پیشرونده و پسرونده اسکارن­زایی و ترکیب سنگ دیواره، متغیر است ولی بخوبی با شاخص­های تشکیل مگنتیت در محیط اسکارن (منیزیمی) همخوانی دارد. از جمله آن شاخص­ها می­توان به 1) غلظت بالای Mg  (1 تا 1/5 درصد‌وزنی)، مقادیر پایین Cr (کمتر از ppm 10) و Ti (کمتر از 01/0 درصد) و مقدار ناچیز عناصر ناسازگار چون Ag (کمتر از ppm 5/1)، Rb (کمتر از ppm 1)، Sb (کمتر از ppm 1) و Na (کمتر از 1/0 درصد) در مگنتیت و 2) همبستگی مثبت معنی­دار بین Ti و V و موقعیت نمونه­ها در نمودارهای Ti+V نسبت به Ca+Al+Mn و Ni/(Cr+Mn)  اشاره کرد. مگنتیت­های رگچه­ای دما بالای مرحله پیشرونده، کبالت بیشتری نسبت به مگنتیت­های جانشینی همزمان با ته­نشینی سولفیدها (مرحله پسرونده) دارند و این نشان می­دهد که در سامانه‌ اسکارنی علم کندی، تغلیظ کبالت در مگنتیت در کنترل فراوانی نهشت کانی­های سولفیدی است.    

کلیدواژه‌ها

عنوان مقاله [English]

Magnetite geochemistry an approach to determining the physicochemical conditions of Alam- Kandy iron skarn formation, West Mahneshan, Zanjan province

نویسندگان [English]

  • Ameneh Amirian
  • Kamal Siahcheshm
چکیده [English]

Alam-Kandy iron skarn lies at the contact margin of a granodiorite stock with limestone and dolomites of Soltanieh Formation. Anhydrous prograde calc-silicate assemblages (garnet, diopside, wollastonite) were replaced by a series of hydrous calc-silicates (serpentine, epidote, tremolite-actinolite) and/or quartz, calcite, magnetite, hematite, and pyrite. During this event, magnetite lenses (±hematite and pyrite) are formed with various textures such as massive, banded, scattered grains and veins at the vicinity of the intrusion body and the contact zones. According to this study, The geochemistry of trace elements of magnetite is variable under the influence of progressive and regressive stages of skarn formation and wall rock composition, and consistant with the indicators of magnetite formation in the (magnesium) skarn environment. These include factors such as: 1) high concentration of Mg (1 to 1.5 %), low values of Cr (<10 ppm), Ti (<0.01%) and insignificant incompatible elements such as Ag (0.5 ppm) 1 <), Rb (ppm 1 <), Sb (ppm 1 <) and Na (less than 0.1%) in magnetite; 2) significant positive correlation between Ti and V and the position of the samples in the Ti+V versus Ca+Al+Mn and Ni/(Cr + Mn) diagrams. High temperature vein-veinlet magnetites have more cobalt content than the replacement magnetites syn-deposited by sulfide minerals (retrograde stage), indicating that in the Alam Kennedy skarn system, the concentration of cobalt in the magnetite is controlled by the abundance of sulfide mineral deposits.

 

کلیدواژه‌ها [English]

  • iron skarn
  • prograde
  • retrograde
  • geochemistry of magnetite
  • Alam-Kandy

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  • تاریخ دریافت: 11 اسفند 1400
  • تاریخ بازنگری: 27 اردیبهشت 1401
  • تاریخ پذیرش: 04 خرداد 1401

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