بررسی شیمی کانی کلینوپیروکسن در آمفیبولیت‌های مجموعه برافزایشی مکران (جنوب‌شرق ایران)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه لرستان، خرم آباد، ایران

2 موسسه زمین‌شناسی و زمین‌فیزیک، انجمن علوم چین

3 گروه زمین‌شناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران

چکیده

آمفیبولیت‌های مورد بررسی در نزدیکی دهستان هشت‌بندی از توابع شهرستان میناب قرار دارند. این آمفیبولیت‌ها بخشی از سنگ‌های دگرگونی کمربند افیولیتی مکران ‌شمالی را تشکیل می‌دهند که به دو صورت جهت‌یافته و توده‌ای یافت می‌شوند. بر اساس کانی‌های شاخص، این سنگ‌ها شامل آمفیبولیت، اپیدوت-گارنت- پیروکسن آمفیبولیت و گارنت-پیروکسن آمفیبولیت هستند. کانی‌های اصلی تشکیل‌دهنده آن‌ها آمفیبول، گارنت، پلاژیوکلاز، پیروکسن، اپیدوت، کوارتز و اسفن هستند. بر اساس شیمی کانی، کلینوپیروکسن در اپیدوت-گارنت- پیروکسن آمفیبولیت‌ها و گارنت-پیروکسن آمفیبولیت‌ها از نوع کلسیمی است و بیشتر در گستره دیوپسید قرار می گیرد. این پیروکسن‌ها ماهیت ماگمایی  و دگرگونی دارند و از Si غنی هستند و در زمینه سنگ‌های نیمه قلیایی (تولئیتی و آهکی قلیایی) قرار دارند. کلینوپیروکسن‌های مورد بررسی محیط‌های در ارتباط با کمان آتشفشانی را نشان می‌دهند و بر اساس دما -فشارسنجی، در گستره‌ی دمایی 1070 تا 1130درجه سانتی‌گراد و فشار 5 تا 10 کیلوبار تشکیل شده‌اند که گویای تشکیل این کانی‌ها در دمای بالا و فشار متوسط-بالاست. همچنین مقدار آهن سه ظرفیتی در کلینوپیروکسن‌ها نشان دهنده‌ی گریزندگی پایین اکسیژن در محل تشکیل آن‌هاست.

کلیدواژه‌ها


عنوان مقاله [English]

The study of clinopyroxene mineral chemistry in the amphibolites from the Makran accretionary complex (southeast of Iran)

نویسندگان [English]

  • Maryam Souri 1
  • Ahmad Ahmadi Khalaji 1
  • Jiamin Wang 2
  • Rasoul Esmaeili 3
  • Mohammad Ebrahimi 3
1 Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran
2 Institute of Geology and Geophysics, Academy of Sciences, Beijing, China
3 Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
چکیده [English]

The studied amphibolites are located in Hashtbandi Village, east of Minab. The Makran amphibolites form as a part of the metamorphic rocks of northern Makran ophiolitic belt, which are found in massive and orientated forms. Based on the indicator minerals, these rocks are amphibolite, epidote-garnet amphibolite and garnet-pyroxene amphibolite. Their main minerals include amphibole, garnet, plagioclase, pyroxene, epidote, quartz and sphene. Based on mineral chemistry, clinopyroxene in the epidote-garnet amphibolite and garnet-pyroxene amphibolite is calcic type and mostly in the diopside range. The studied pyroxenes are mostly magmatic and enriched in Si and are placed in the context of sub-alkaline rocks (tholeiitic and calc-alkaline). These clinopyroxenes are related to volcanic arc and based on the temperature-pressure calculations of pyroxenes, the temperature ranges between 1070 to 1130 C and the pressure is 5 to 10 kbar, which indicates the crystallization of these minerals have taken place at high temperature and medium-high pressure. Also, based on the amount of ferric ion in clinopyroxenes, they formed in the low oxygen fugacity environment.

کلیدواژه‌ها [English]

  • clinopyroxene
  • geothermobarometry
  • Mineral chemistry
  • amphibolite
  • Makran
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