دوره 28، شماره 4 - ( 10-1399 )                   جلد 28 شماره 4 صفحات 921-932 | برگشت به فهرست نسخه ها


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Karimi, Ahmadi, Partabian. Mineral chemistry and thermobarometry of Kurdistan ophiolitic peridotites, Zagros, western Iran. www.ijcm.ir. 2020; 28 (4) :921-932
URL: http://ijcm.ir/article-1-1558-fa.html
کریمی آزاد، احمدی علی، پرتابیان عبدالرضا. ترکیب شیمیایی کانی‌ها و دما-فشارسنجی پریدوتیت‌های افیولیت‌های کردستان، زاگرس، غرب ایران. مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (4) :921-932

URL: http://ijcm.ir/article-1-1558-fa.html


1- دانشگاه سیستان و بلوچستان زاهدان
چکیده:   (260 مشاهده)
کانی‌شناسی و زمین‌دما-فشارسنجی پریدوتیت‌ها در مجموعه افیولیتی مریوان – کامیاران به عنوان بخشی از افیولیت‌های نئوتتیس در رشته‌کوه زاگرس، غرب ایران، بررسی شد. نمونه‌های مورد بررسی شامل انواع پریدوتیت‌های گوشته‌ای ‌و پوسته‌ای هستند. نتایج ریزپردازش الکترونی پریدوتیت‌ها نشان می­دهد که الیوین از نوع فورستریت (Fo88 - Fo92)، کلینوپیروکسن از نوع اوژیت دیوپسیدی (En48-56 Fs3-6 Wo39-49) و ارتوپیروکسن از نوع انستاتیت (En90-91). عدد کرم (Cr#) و عدد آلومینیم (Al#) در اسپینل‌های پریدوتیت‌های گوشته‌ای به ترتیب 33-59 و 41-67 هستند. Cr# و Al# در اسپینل‌های پریدوتیت‌های پوسته‌ای نیز بترتیب 67-98 و 2-32 هستند. محاسبات زمین‌دما-فشارسنجی برای پریدوتیت‌های گوشته‌ای دمای متوسط 1100 درجه سانتی‌گراد و فشار متوسط 14 کیلوبار را نشان می‌دهد. پریدوتیت‌های پوسته‌ای در دمای900 درجه سانتی‌گراد و فشار 7 کیلوبار تشکیل شده‌اند. دو ترکیب شیمیایی متمایز برای کانی‌های پریدوتیت‌های گوشته‌ای افزون بر تأکید بر وجود دو نوع پریدوتیت گوشته‌ای در منطقه، بیانگر احتمال اثر برهمکنش مذاب-سنگ بر پریدوتیت‌های گوشته‌ای منطقه است.    
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نوع مقاله: پژوهشي | موضوع مقاله: تخصصي

فهرست منابع
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