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جلد 31 شماره 2 صفحات 228-209 |
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Bahramnejad E, Bagheri S, Sharifi M, Torabi G, Noghreyan M. Dumak ophiolitic mélange, west of Zahedan (Eastern Iranian Range) Special focus on petrographic and geochemical properties of pillow lavas and sheeted dikes. www.ijcm.ir 2023; 31 (2) :209-228
URL: http://ijcm.ir/article-1-1757-fa.html
URL: http://ijcm.ir/article-1-1757-fa.html
بهرام نژاد الهام، باقری ساسان، شریفی مرتضی، ترابی قدرت، نقره ئیان موسی. آمیزه افیولیتی دومک، غرب زاهدان (کوهزاد شرق ایران): نگاهی ویژه بر مشخصه‌های سنگ‌نگاری و زمین‌شیمیایی گدازههای بالشی و دایکهای ورقهای. مجله بلورشناسی و کانی شناسی ایران. 1402; 31 (2) :209-228
الهام بهرام نژاد1 
، ساسان باقری* 2، مرتضی شریفی1 ، قدرت ترابی1 ، موسی نقره ئیان1
، ساسان باقری* 2، مرتضی شریفی1 ، قدرت ترابی1 ، موسی نقره ئیان1
1- گروه زمین‌شناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران
2- گروه زمین شناسی، دانشکده علوم پایه، دانشگاه سیستان و بلوچستان، زاهدان، ایران
2- گروه زمین شناسی، دانشکده علوم پایه، دانشگاه سیستان و بلوچستان، زاهدان، ایران
چکیده: (734 مشاهده)
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.
واژه‌های کلیدی: دومک، نئوتتیس، افیولیت، شرق ایران.
فهرست منابع
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