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فروغ ملک محمودی علیرضا داودیان دهکردی ناهید شبانیان بروجنی حسین عزیزی

چکیده

اکلوژیت­‌های مورد بررسی بخشی از کمپلکس دگرگونی شمال شهرکرد هستند که به پهنه­ ساختاری سنندج-سیرجان تعلق دارند. این اکلوژیت­‌ها با ترکیب کانی شناسی غالب آمفیبول، گارنت، زوئیزیت و پیروکسن (امفاسیت) به‌صورت عدسی­‌هایی همراه پاراگنایس­‌های نئوپروتروزوئیک مشاهده می­‌شوند. مجموعه کانیایی این سنگ­ها نشان‌دهنده دگرگونی آنها در فشار بالا‌ست. با در‌نظر‌گرفتن سیستم نسبتاً بسته در تعادلات شیمیايی این سنگ‌ها در طی فرایندهای دگرگونی می‌­توان محیط تشکیل سنگ مادر این سنگ­‌ها را مورد بررسی قرار داد. نمودار عناصر نادر خاکی بهنجار‌شده به کندریت، غنی­‌شدگی جزئی از عناصر نادر خاکی سبک نسبت به عناصر نادر خاکی سنگین را نشان می­‌دهد و نسبت La/Yb)cn) در این نمونه‌ها بین 7/1 تا 7/2 متغیر است. نمودار عناصر نادر بهنجار‌شده به گوشته­ اولیه آنومالی منفی Ti ،Nb ،P و Y را نشان می­‌دهد. نمودارهای ژئوشیمیایی نشان‌دهنده تمایل زیاد این سنگ‌ها با بازالت­‌های تولئیتی است که در محیط­‌های کششی پشت‌کمان شکل گرفته‌­اند. بررسی‌های ایزوتوپی Sr-Nd نشان‌دهنده­ ماگمای اولیه این سنگ‌ها با ترکیب گوشته­ غنی‌­شده  بالای زون فرورانش است. با توجه به الگوی پراگندگی عناصر و نسبت‌­های ایزوتوپی اولیه می­‌توان تشکیل سنگ مادر اکلوژیت‌های منطقه را ناشی از کشش­‌های پشت‌کمان در پهنه سنندج-سیرجان در اواخر پروتروزوئیک پایانی (ادياكاران) دانست.

جزئیات مقاله

کلمات کلیدی

اکلوژیت, گوشته غنی‌ شده, نسبت های ایزوتوپی Nd-Sr, شمال شهرکرد, پهنه سنندج-سیرجان

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ارجاع به مقاله
ملک محمودیف., داودیان دهکردیع., شبانیان بروجنین., & عزیزیح. (2019). ويژگی های ژئوشیمیایی و ایزوتوپی پروتوليت اکلوژیت های شمال شهرکرد: شاهدی بر تكوين حوضه پشت‌ کمان نئوپروتروزوئیک در پهنه سنندج-سیرجان. زمین‌شناسی اقتصادی, 11(3), 439-456. https://doi.org/10.22067/econg.v11i3.68644
نوع مقاله
علمی- پژوهشی