کاربرد شیمی کروم‌اسپینل در مطالعه سنگ‌زایی و محیط زمین‌ساختی پریدوتیت‌های مجموعه افیولیتی شمال‌ شرق کامیاران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه زنجان

2 دانشگاه پیام نور

چکیده

مجموعه افیولیتی شمال شرق کامیاران بیشتر متشکل از هارزبورژیت­ است و بخش­های لرزولیتی با گسترش محدود در این مجموعه وجود دارند. هارزبورژیت­ها به شدت به سرپانتینیت تبدیل شده­اند و در بخش­های هارزبورژیتی، عدسی­های کوچک از کانه­زایی کرومیت دیده می­شوند. کانی‌های تشکیل­ دهنده هارزبورژیت­ها و لرزولیت­ها شامل الیوین، ارتوپیروکسن، کلینوپیروکسن و کانی فرعی اسپینل هستند. بر اساس نتایج تجزیه ریزپردازشی روی بلورهای اسپینل، این کانی از نوع کروم و آلومینیم‌دار بوده (کروم‌اسپینل) و دارای مقادیر  بسیار بالای  Mg# (9/71-2/55) و Cr# (5/45-3/34) و مقادیر پایینTiO2  (میانگین 06/0 درصد وزنی) است. مقدار Fe3+ در کروم ‌اسپینل­های سنگ‌های مورد بررسی بالاست (میانگین 8/0 درصد وزنی) که نشان­­دهنده تبلور در شرایط گریزندگی بالای اکسیژن است. با توجه به داده­های تجزیه نقطه­ای، مقدار MgO در الیوین­ها بین 04/50 تا 99/52 درصد وزنی بوده و ترکیب آن­ها از نوع فورستریت (42/91-68/90Fo) است. براساس شیمی کانی اسپینل، پریدوتیت‌های مجموعه افیولیت شمال­شرق کامیاران از نوع پریدوتیت­های تهی­شده و پسماندی است و در محیط زمین­ساختی پشته­های میان اقیانوسی (مورب) تشکیل شده­اند.     

کلیدواژه‌ها

عنوان مقاله [English]

Application of Cr-spinel mineral chemistry in petrogenetic evolution and tectonic setting of NE Kamyaran ophiolitic complex

نویسندگان [English]

  • ayoub Veisinia 1
  • Mohammad Ebrahimi 1
  • Mirali Mokhtari 1
  • Jamshid Ahmadian 2
  • Amirmorteza Azimzadeh 1
1 University of Zanjan
2 Payame Noor University
چکیده [English]

Northeast Kamyaran ophiolitic complex is mainly composed of harzburgite along with small outcrops of lherzolite. Harzburgites are extensively altered to serpentinite. Small lenses of chromite mineralization are observed in harzburgites. The mineral assemblage present in the study harzburgite and lherzolite are olivine, orthopyroxene and clinopyroxene along with minor amount of spinel. Microprobe studies on the spinel indicate that it is Cr and Al bearing spinel (Cr-spinel) with very high Mg# (55.2-71.9) and Cr# (34.3-45.5) values and low values of TiO2 (with average value of 0.6 wt%). Fe3+ content of the Cr-spinel in the study rocks is high (with average value of 0.8 wt %) indicating that the crystallization occurred at high oxygen fugacity. According to the microprobe data, MgO content of olivine varies between 50.04 and 52.99 wt% and its composition is forsterite (Fo90.68-91.42). Based on the mineral chemistry of spinel, peridotites of Northeast Kamyaran ophiolitic complex belong to residual depleted peridotites which have formed in mid ocean ridge tectonic setting.

کلیدواژه‌ها [English]

  • Mineral chemistry
  • Cr-spinel
  • Mantle peridotite
  • ophiolite
  • Kamyaran

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  • تاریخ دریافت: 14 مرداد 1396
  • تاریخ بازنگری: 08 آبان 1396
  • تاریخ پذیرش: 20 آذر 1396

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