دوره 26، شماره 1 - ( 1-1397 )
جلد 26 شماره 1 صفحات 178-161 |
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The use of textural and mineralogical evidence for determination of melt-rock reaction, partial melting and origin of Kermanshah peridotites. www.ijcm.ir 2018; 26 (1) :161-178
URL: http://ijcm.ir/article-1-1058-fa.html
URL: http://ijcm.ir/article-1-1058-fa.html
مرادپور علی، زارعی سهامیه رضا، احمدی خلجی احمد، ساریخانی رامین. بررسی واکنش گدازه/سنگ، ذوببخشی و خاستگاه پریدوتیت‌های کرمانشاه به کمک شواهد بافتی و شیمی کانی. مجله بلورشناسی و کانی شناسی ایران. 1397; 26 (1) :161-178
1- دانشگاه لرستان
چکیده: (3683 مشاهده)
افیولیت کرمانشاه واقع در کمربند افیولیتی بیرونی زاگرس با اجزاء مختلف گوشتهای و پوستهای، بازماندهای از شاخه جنوبی اقیانوس نئوتتیس در ایران به شمار میآید. نمودارهای تقسیمبندی کانیها بیانگر ترکیب فورستریتی الیوین در دونیت، هارزبورژیت و لرزولیتها و ترکیب کریزولیتی الیوین در ورلیتها و نیز برای ارتوپیروکسن و کلینوپیروکسنها به ترتیب نشان دهنده ترکیب انستانیتی و دیوپسید تا اوژیتی هستند. شواهد بافتی چون تیغههای جدایشی کلینوپیروکسن در ارتوپیروکسن و دانههای زنجیر مانند اسپینل در کانیهای موجود در سنگهای فامافیک منطقههای صحنه، هرسین- نورآباد و میانراهان شواهدی از سرد شدن همراه با کاهش فشار، گدازهبخشی و واکنش مذاب/سنگ را نشان میدهند. مودال بسیار پایین کلینوپیروکسن، الیوین غنی از منیزیم و مقدار بالای Cr# و نسبت Cr/Alدر اسپینلهای مناطق مورد بررسی همگی نشاندهنده نرخ ذوببخشی بالا برای هارزبورژیت و دونیتها هستند. مقادیر Al2O3، TiO2 و FeO/MgO محاسبه شده در گدازه مولد اسپینلها و همه نمودارهای تعیین کننده محیط زمینساختیماگمایی نشان میدهند که پریدوتیت منطقههای مورد بررسی از ماگماهای بونینیتی جلوی قوس (مانند پیکریتها و تولئیتهای جزایر قوسی) در موقعیت SSZ شکل گرفتهاند.
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https://doi.org/10.1130/0091-7613(2002)030<0899:BVITOO>2.0.CO;2 [DOI:10.1130/0091-7613(2002)0302.0.CO;2]
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