سنگ‌شناسی و شیمی‌سنگ کل آمفیبولیت‌های مجموعه برافزایشی مکران، جنوب شرق ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه لرستان

2 دانشگاه زنجان

چکیده

آمفیبولیت­های مکران در موقعیت­های مختلف کمربند افیولیتی مکران شمالی رخنمون دارند. براساس بررسی­های سنگ­شناسی و کانی­شناسی، سنگ­های این منطقه شامل آمفیبولیت معمولی (جهت یافته و توده­ای)، گارنت-پیروکسن آمفیبولیت، اپیدوت-گارنت آمفیبولیت و مرمر هستند. کانی­های آمفیبولیت­های معمولی (جهت­یافته و توده­ای) شامل آمفیبول، پلاژیوکلاز، آپاتیت، زیرکن، کوارتز و اسفن هستند. افزون بر این کانی­ها، در گارنت-پیروکسن آمفیبولیت­ها، گارنت و پیروکسن و در اپیدوت-گارنت آمفیبولیت­ها، اپیدوت، گارنت و پیروکسن نیز دیده می­شود. مرمرها نیز دارای کلسیت با رخ مشخص، کوارتز و آمفیبول هستند. زمین شیمی آمفیبولیت­ها نشان می­دهد که این سنگ­ها دارای خاستگاه آذرین با سنگ مادر بازالتی هستند که از یک گوشته غنی شده شکل گرفته­اند. همچنین نمونه­های مورد بررسی در گستره سری تولئیتی تا انتقالی قرار دارند و براساس نمودارهای تغییرات عناصر خاکی نادر بهنجار شده به کندریت و بازالت پشته­های میان اقیانوسی نوع مورب عادی (N-MORB) دارای الگوهای به نسبت شبیه بوده و از نظر ویژگی­های زمین شیمیایی، مشابه بازالت­های مورب و درون صفحه اقیانوسی هستند.

کلیدواژه‌ها

عنوان مقاله [English]

Petrology and geochemistry of the amphibolites from Makran accretionary complex, Southeast of Iran

نویسندگان [English]

  • Maryam Souri 1
  • Ahmad Ahmadikhalaji 1
  • Mohammad Ebrahimi 2
  • Rasoul Esmaeili 2
1 University of Lorestan
2 University of Zanjan
چکیده [English]

   Makran amphibolites are exposed in different locations in the northern Makran ophiolitic belt. Based on lithological studies and mineral assemblages in these rocks, they are containing ordinary amphibolite (oriented and massive), garnet-pyroxene amphibolite, epidote-garnet amphibolite and marble. The minerals that made up ordinary amphibolites (oriented and massive) include amphibole, plagioclase, zircon apatite, quartz and sphene. In addition to these minerals, garnet and pyroxene are found in garnet-pyroxene amphibolites. In addition, epidote, garnet and pyroxene are found in epidote-garnet amphibolites. Also, marbles are containing calcite with a distinct cleavage, quartz and amphibole. Geochemistry of amphibolites shows that these amphibolites are of igneous origin with basaltic protolith that originate from an enriched mantle. Amphibolite samples of the region have relatively similar composition based on the diagrams of changes of normalized rare earth elements to chondrite and N-MORB and are also similar to mid-oceanic ridge basalts (MORB) as well as within plate volcanic zone (WPVZ) basalts in terms of geochemical properties.

کلیدواژه‌ها [English]

  • lithology
  • whole rock chemistry
  • amphibolite
  • enriched mantle
  • Makran

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  • تاریخ دریافت: 04 اردیبهشت 1401
  • تاریخ بازنگری: 27 تیر 1401
  • تاریخ پذیرش: 24 مرداد 1401

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