آمیزه افیولیتی دومک، غرب زاهدان (کوهزاد شرق ایران): نگاهی ویژه بر مشخصه‌های سنگ‌نگاری و زمین‌شیمیایی گدازه‌های بالشی و دایک‌های ورقه‌ا‌ی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران

2 گروه زمین شناسی، دانشکده علوم پایه، دانشگاه سیستان و بلوچستان، زاهدان، ایران

چکیده

آمیزه افیولیتی دومک در منطقه بلوچستان تقریباً همه اجزاء یک افیولیت کامل را در بر دارد و در بخش میانی کرانه غربی رشته کوه­های شرق ایران واقع شده ­است. بررسی­های صحرایی نشانگر حضور حجم عظیمی از گدازه­های بالشی در بخش­های مختلف آمیزه افیولیتی دومک است. رخنمون دایک­های ورقه­ای مربوط به آمیزه دومک محدود به منطقه شورو است. این دایک­ها در زیر گدازه­های بالشی و رسوب­های لجه­ای کرتاسه ظاهر شده­اند. ترکیب سنگ­شناسی اغلب گدازه­های بالشی و دایک­های ورقه­ای مورد بررسی بازالت است. تغییرات SiO2 نسبت به‌ FeOt/MgO در گدازه‌های بالشی‌ و دایک­های ورقه­ای مورد بررسی بیانگر روند تولئیتی‌‌ برای ماگمای سازنده آنهاست. الگوی عناصر خاکی نادر و نسبت N(La/Sm) برای این سنگ­ها شبیه بازالت­های پشته های میان اقیانوسی نوع مورب غنی شده (E-MORB) است. بررسی گدازه­های بالشی و دایک­های ورقه­ای آمیزه افیولیتی دومک نشان می­دهد که بدنه افیولیتی بازالت­های پشته­های میان اقیانوسی نوع مورب غنی شده (MORB) در دومک به تدریج و در ادامه دگرگونی­های خود در شرایط یک پهنه ابرفرورانشی و آغاز فرورانش درون اقیانوسی واقع است. شواهد ساختاری منطقه نشان می­دهد که پس از اضافه گردیدن افیولیت دومک به قطعه لوت با تداوم حرکت زمین­ساختی مربوط به خمش اروکلاینی، آمیزه جدیدی با حضور قطعه­های کربناتی ائوسن شکل گرفته است.    

کلیدواژه‌ها

عنوان مقاله [English]

Dumak ophiolitic mélange, west of Zahedan (Eastern Iranian Range) Special focus on petrographic and geochemical properties of pillow lavas and sheeted dikes

نویسندگان [English]

  • Elham Bahramnejad 1
  • Sasan Bagheri 2
  • Mortaza Sharifi 1
  • Ghodrat Torabi 1
  • Mousa Noghreyan 1
1 Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
2 Department of Geology, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran
چکیده [English]

The Dumak ophiolitic mélange in the Baluchistan region is one of the ophiolitic mélanges that contains all of the components of a complete ophiolite, located in the middle parts of the western margin of the Eastern Iranian range. Field studies indicate the presence of a large volume of pillow lavas in different parts of the Dumak mélange. The outcrop of sheeted dikes associated with the Dumak mélange is limited to the Shuru region. These dikes present below the pillow lava and Cretaceous pelagic sediments. Compositionaly, most of pillow lavas and sheeted dikes are basalt. Variations in SiO2 to FeOt/MgO in the pillow lavas and sheeted dikes indicates a tholeiitic trend for their productive magma. The pattern of REE elements and amounts of (La/Sm)N in these rocks are similar to E-MORB. The study of pillow lavas and sheeted dykes of Dumak ophiolitic mélange shows that the MORB ophiolitic body in Dumak has been gradually and continuously evolved in a supra-subduction zone environment and beginning of intra-oceanic subduction. Considering structural evidence of the region, after adding the Dumak ophiolite to the Lut block, during the continuation of tectonic movements related to orocline bending, a new mélange has formed with the presence of Eocene carbonate blocks.

کلیدواژه‌ها [English]

  • Dumak
  • Neo-Tethys
  • ophiolite
  • eastern Iran

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  • تاریخ دریافت: 14 تیر 1401
  • تاریخ بازنگری: 26 مهر 1401
  • تاریخ پذیرش: 02 آبان 1401

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