زمین دما-فشارسنجی سنگ‌های فرامافیک‌ صحنه، هرسین- نورآباد (شمال شرق کرمانشاه)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان کرمانشاه

2 دانشگاه لرستان

چکیده

افیولیت­های صحنه، هرسین – نورآباد (استان کرمانشاه) واقع در کمربند افیولیتی بیرونی زاگرس، بخشی از نوار افیولیتی کرتاسه هستند که به عنوان بازمانده­­های شاخه جنوبی اقیانوس از عمان تا شمال غرب سوریه، قبرس و آنتالیا بر سپر عربی- تائوریک فرا­رانده شده­اند. محاسبه ضریب جدایش نسبت  Fe/Mgبرای کانی الیوین بیانگر خاستگاه گوشته­ای این کانی است. شواهد بافتی موجود در سنگ­های فرامافیک نشان از سرد شدن همزمان با کاهش فشار، ذوب بخشی و واکنش مذاب/سنگ دارند. نمودار­های تعیین کننده محیط زمین­ساختی ماگمایی افزون بر نمایش نمونه­ها در میدان آرایش گوشته­ای الیوین- اسپینل بیانگر قرارگیری آن­ها در میدان پریدوتیت­های منطقه ابر فرورانش (SSZ) است. بر اساس محاسبات انجام شده با واسنجی­های مختلف، دما و فشار تبلور سنگ­های هارزبورژیتی و لرزولیتی 1100 تا 1500 درجه سانتیگراد و 12 تا 18 کیلوبار و برای نمونه ورلیتی 1200 تا 1500 سانتیگراد و 21 تا 23 کیلوبار است که با محیط تشکیل SSZ همخوانی دارد.    

کلیدواژه‌ها

عنوان مقاله [English]

Geothermobarometry of Sahneh, Harsin-Nourabad ultramafic rocks (NE-Kermanshah)

نویسندگان [English]

  • Moradpour 1
  • Ahmadi Khalaji 2
  • Zarei Sahamieh 2
  • Sarikhani 2
  • Emami Meybodi 2
1
2
چکیده [English]

Sahneh, Harsin-Nourabad ophiolits (Kermanshah Provience) located in outer Zagros ophiolitic zone and are parts of the Cretaceous ophiolitic belt, as remnants of southern branch of the Neo-Tethys Ocean obducted over the Arabic–Tauric platform from Oman to northwestern Syria, Cyprus and Antalya. Calculation of Fe/Mg separation coefficient of olivine indicates the mantle origin of this mineral. Textural evidence of ultramafic rocks displays clear evidence of cooling with decompression, partial melting and melt-rock reactions. Tectonomagmatic discrimination diagrams show that peridotite samples are located in olivine- spinel mantle array and SSZ peridotite field. Based on geothermobarometry calibration the temperature and pressure of crystallization of harzburgite and lherzolite rocks were 1100 to 1500 ° C and 12 to 18 Kbar and the wehrlite sample was 1200 to 1500 ° C and 21 to 23 Kbar, which corresponds to the SSZ tectonic environment.

کلیدواژه‌ها [English]

  • ultramafic
  • SSZ
  • geothermobarometry
  • ophiolite
  • Kermanshah

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  • تاریخ دریافت: 20 اسفند 1399
  • تاریخ بازنگری: 22 فروردین 1400
  • تاریخ پذیرش: 25 اردیبهشت 1400

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