نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

شیمی کانی آمفیبول در آمفیبولیت‌های مجموعه برافزایشی مکران (جنوب‌شرق ایران)

نویسندگان
1 دانشگاه لرستان
2 آکادمی علوم چین
3 دانشگاه زنجان
چکیده
آمفیبولیت‌ها بخشی از سنگ‌های دگرگونی کمربند افیولیتی مکران ‌شمالی را تشکیل می‌دهند که به دو صورت جهت‌یافته و توده‌ای یافت می‌شوند. براساس کانی‌های شاخص، این سنگ‌ها شامل آمفیبولیت، گارنت-پیروکسن آمفیبولیت و اپیدوت-گارنت آمفیبولیت هستند. کانی‌های اصلی تشکیل‌دهنده آنها شامل آمفیبول، گارنت، پلاژیوکلاز، پیروکسن، اپیدوت، کوارتز و اسفن می‌باشد. براساس شیمی کانی، آمفیبول‌ در این سنگ‌ها از نوع کلسیک بوده و عمدتا ترکیبی در محدوده‌ی مگنزیو تا فروهورنبلند دارد. محاسبات تعیین دما -فشار آمفیبول‌ها، فشار kbar7 (kbar 4-6) و گستره دمایی 800-750 درجه سانتی‌گراد را نشان می‌دهند. بدین ترتیب بررسی‌های زمین دما - فشارسنجی این کانی نشان می‌دهد که آمفیبولیت‌های مکران در رخساره‌های دگرگونی دمای بالا و فشار کم تا متوسط (دگرگونی نوع آبوکوما) دگرگون شده‌اند.
کلیدواژه‌ها

عنوان مقاله English

Amphibole mineral chemistry of 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 Lorestan University
2 University of Chinese Academy of Sciences
3 University of Zanjan
چکیده English

Amphibolites are a major component of the northern Makran ophiolite belts. They include both foliated and massive types. They are diverse in mineralogy and include amphibolite, garnet-pyroxene amphibolite, and epidote-garnet amphibolite. In addition to plagioclase and amphibole, which are the main constituent phases, other minerals such as zircon, sphene and quartz are also found in amphibolites. According to mineral chemistry, the amphiboles in these rocks are calcic type, and compositionally range from magnesian to ferrohornblende. Geothermobarometry of the amphiboles indicates a pressure ≤ 7 kbar (4-6 kbar) and a temperature range of 750-800°C. Thus, geothermobarometry of amphiboles shows that the Makran amphibolites were metamorphosed at high-temperature and low to medium pressure metamorphic facies (Abukuma-type metamorphism).

کلیدواژه‌ها English

Amphibole
Geothermobarometry
Mineral chemistry
Amphibolite
Makran
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