بررسی واکنش گدازه/سنگ، ذوب‌بخشی و خاستگاه پریدوتیت‌های کرمانشاه به کمک شواهد بافتی و شیمی کانی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه لرستان

چکیده

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.     

کلیدواژه‌ها

عنوان مقاله [English]

The use of textural and mineralogical evidence for determination of melt-rock reaction, partial melting and origin of Kermanshah peridotites

چکیده [English]

The Kermanshah ophiolite complex is located in outer Zagros ophiolitic belt and consists of both mantle and crustal suites as remnants of southern branch of the Neo-Tethys Ocean in Iran. Chemical composition determinative diagram of minerals indicates that olivine in dunite, harzburgite and lherzolites has forsteritic composition and in wherlitic rocks is chrysolite in composition likewise orthopyroxene and clinopyroxene in these rocks are enstatitic and diopside to augitic composition respectively. Textural evidence such as exsolution lamellae of clinopyroxene in orthopyroxene and  chain-like grains of spinel in minerals of ultramafic rocks of Sahneh, Harsin-Nourabad and Myanrahan region displaying clear evidence of cooling with decompression, partial melting and melt-rock reactions. Very low modal of clinopyroxene, Mg rich olivines and high Cr# content and Cr/Al ratio of chromian spinel from ultramafic cumulates indicate that dunites and harzburgitic rocks have formed by high degrees of partial melting. Calculated TiO2, Al2O3 and FeO/MgO ratio in the parental melt that was in equilibrium with chromian spinels and also all of used discrimination diagrams are compatible with a forearc boninitic magma (such as  picrites or island arc tholeiites) in supra-subduction zone setting.

کلیدواژه‌ها [English]

  • Mantle peridotite
  • boninite
  • arc
  • melt-rock reaction
  • Kermanshah ophiolite

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مجله بلورشناسی و کانی شناسی ایران
دوره 26، شماره 1 - شماره پیاپی 69
فروردین 1397
صفحه 161-178

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  • تاریخ دریافت: 03 اسفند 1395
  • تاریخ بازنگری: 08 خرداد 1396
  • تاریخ پذیرش: 26 تیر 1396

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