سنگ‌نگاری، شیمی سنگ کل و شرایط تشکیل آمفیبولیت‌های شرق سلماس، شمال غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه تبریز

چکیده

آمفیبولیت­های شرق سلماس به­عنوان یکی از گسترده­ترین واحدهای مجموعه دگرگونی، در شمال غرب پهنه سنندج – سیرجان واقع بوده که براساس بررسی­های صحرایی، بیشتر از نوع آمفیبولیت­های جهت­یافته و دارای برگوارگی هستند. بر پایه بررسی های میکروسکوپی، آمفیبولیت­ها شامل آمفیبولیت­ها، بیوتیت – آمفیبولیت­ها، اپیدوت – آمفیبولیت­ها، بیوتیت - اپیدوت – آمفیبولیت­ها، ترمولیت - اکتینولیت – آمفیبولیت­ها و بیوتیت - کلینوپیروکسن- آمفیبولیت­ها هستند. نمونه­های آمفیبولیتی منطقه براساس نمودارهای تغییرات عناصر خاکی نادر بهنجار شده به کندریت، بازالت­های پشته­های میان اقیانوسی غنی شده، EMORB و گوشته اولیه دارای بیشترین الگوی موازی بوده و از نظر ویژگی­های زمین شیمیایی مشابه بازالت­های درون صفحه­ای هستند. با توجه به نتایج شیمی سنگ کل، آمفیبولیت­های مورد بررسی بیشتر از نوع اورتوآمفیبولیت با سنگ مادر از نوع بازالت و از نوع سری ماگمایی ساب آلکالن هستند که در جایگاه زمین­ساختی درون صفحه­ای قرار دارند.

کلیدواژه‌ها

عنوان مقاله [English]

Petrography, whole rock chemistry and study of formation condition of amphibolites in east of Salmas, northwest of Iran

نویسندگان [English]

  • Saeidi
  • Hajialioghli
  • Moazzen
چکیده [English]

The amphibolites of east Salmas, as one of the widest units of the metamorphic complex, are located in the northwest of Sanandaj-Sirjan zone, which according to field studies are mainly oriented and foliated amphibolites. Based on microscopic studies, amphibolites include amphibolites, biotite-amphibolites, epidote-amphibolite, biotite-epidote-amphibolite, tremolite-actinolite-amphibolite, and biotite-clinopyroxene-amphibolite. Amphibolite specimens of the region have maximum parallel pattern based on the variation diagrams of rare earth elements normalized to chondrite, EMORB and primary mantle and are similar to intra-plate basalts in terms of geochemical properties. According to the results of whole rock chemistry, the study amphibolites are mainly ortho-amphibolites with a basaltic protolith and calc-alkaline magmatic series, which are located in the intra-plate tectonic position.

کلیدواژه‌ها [English]

  • petrography
  • whole rock chemistry
  • amphibolites
  • Salmas
  • Iran

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سابقه مقاله

  • تاریخ دریافت: 09 اسفند 1399
  • تاریخ بازنگری: 23 فروردین 1400
  • تاریخ پذیرش: 13 اردیبهشت 1400

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