دوره 26، شماره 4 - ( 10-1397 )
جلد 26 شماره 4 صفحات 914-901 |
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Karimi A, Ahmadi A, Partabian A. Effect of hydrothermal alteration processes on the chemical composition of the extrusive section of the Marivan-Palangan ophiolite complex, Zagros, West of Iran. www.ijcm.ir 2019; 26 (4) :901-914
URL: http://ijcm.ir/article-1-1199-fa.html
URL: http://ijcm.ir/article-1-1199-fa.html
کریمی آزاد، احمدی علی، پرتابیان عبدالرضا. تأثیر فرآیندهای دگرسانی گرمابی بر ترکیب شیمیایی بخش خروجی مجموعه افیولیتی مریوان-پالنگان، زاگرس، غرب ایران. مجله بلورشناسی و کانی شناسی ایران. 1397; 26 (4) :901-914
آزاد کریمی* 
1، علی احمدی1 ، عبدالرضا پرتابیان1
1، علی احمدی1 ، عبدالرضا پرتابیان1
1- دانشگاه سیستان و بلوچستان
چکیده: (3118 مشاهده)
یکی از شاخص‌ترین موارد تاثیر فرآیندهای دگرسانی بر زمینشیمی مورد افیولیت‌هاست. مجموعه افیولیتی مریوان–پالنگان بخشی از افیولیت‌های نئوتتیس در رشته‌کوه زاگرس است که در غرب ایران و در استان کردستان واقع شده‌است. نمونه‌های مورد بررسی شامل کانی‌های ثانویه چون کانی‌های گروه اپیدوت، کلریت، زئولیت‌ها و به مقدار کمتر کلسیت و هیدروکسیدهای آهن به صورت رگه، حفره و شکستگی‌های پر شونده و فازهای جانشینی هستند. تغییرات تراکم عناصر نسبت به مقدار مواد فرار (LOI)، بهنجارسازی نمونه‌ها نسبت به نمونه سالم در منطقه مورد بررسی و نمونه استاندارد، و مدل‌سازی عناصر پایستار نشان می‌دهد که تغییرات تراکم عناصر بسته به شدت دگرسانی متفاوت است، به گونه‌ای که تراکم عناصر سنگدوست بزرگ یون (LILE) مانند K، Cs، Rb و Ba و نیز Na افزایش قابل توجهی نشان داده‌است. اکسیدهای CaO و FeO نسبتاً تهی شده‌اند. عناصر خاکی نادر سبک (LREE) غنی‌شدگی ناچیزی نشان می‌دهند، در حالیکه عناصر خاکی نادر میانه (MREE) و عناصر خاکی نادر سنگین (HREE) تقریباً ثابت مانده‌اند. بنابراین در ارزیابی ویژگی‌های زمینشیمیایی بخش خروجی مجموعه افیولیتی مریوان–پالنگان، تأثیر دگرسانی بر تغییرات تراکم عناصر به ویژه LILEها، CaO، FeO و نیز LREEها را باید در نظر گرفت.
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