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Ansari Z, Poosti M, Ghadami G, Fadaeian M. Mineral chemistry, thermobarometry and petrogenesis of ultramafic rocks of Sahraroud, northeast of Bandar Abbas, Iran. www.ijcm.ir 2024; 32 (4) :795-812
URL: http://ijcm.ir/article-1-1929-fa.html
URL: http://ijcm.ir/article-1-1929-fa.html
انصاری ذبیح اله، پوستی محمد، قدمی غلامرضا، فدائیان محمد. شیمی کانی، دما-فشار سنجی و سنگ‌زایی سنگ‌های فرامافیک صحرارود، شمال شرق بندرعباس، ایران. مجله بلورشناسی و کانی شناسی ایران. 1403; 32 (4) :795-812
ذبیح اله انصاری1 
، محمد پوستی*1 ، غلامرضا قدمی1 ، محمد فدائیان2
، محمد پوستی*1 ، غلامرضا قدمی1 ، محمد فدائیان2
1- گروه زمین شناسی، دانشگاه هرمزگان، بندرعباس، ایران.
2- گروه زمین شناسی، دانشگاه پیام نور، تهران، ایران.
2- گروه زمین شناسی، دانشگاه پیام نور، تهران، ایران.
چکیده: (255 مشاهده)
منطقه مورد بررسی در شمال شرقی استان هرمزگان واقع است. این منطقه در تقسیمهای ساختاری بین پهنههای زاگرس و مکران در کمربند افیولیتی کهنوج -رودان - میناب قرار دارد و شامل سنگ‌های فرامافیک چون هارزبورژیت، لرزولیت، دونیت است. کانیهای اصلی این سنگها بیشتر شامل الیوین، ارتوپیروکسن، کلینوپیروکسن، سرپانتینیت، کروم اسپینل هستند. براساس شیمی کانی‌ها، بلورهای الیوین ترکیب کریزولیت- فورستریت (Fo85 تا Fo89) دارند. ارتوپیروکسن‌ها ترکیب برونزیت- انستاتیت و کلینوپیروکسنها ترکیب دیوپسیدی را نشان می‌دهند. کلینوپیروکسنها در دمای بین 1037 تا 1207 و فشار بالا حدود 6 تا 10 کیلوبار متبلور شدهاند. کانی کروم اسپینل بیشتر ترکیب یکنواخت دارد و با غنی‌شدگی از Al2O3 و TiO2 و ماهیت گوشته‌ای، دارای کمترین مقدار تهی‌شدگی است و تا 14 درصد ذوببخشی را نشان میدهد. سنگ‌های فرامافیک این منطقه در گستره نوع آلپی قرار دارند. پایین بودن مقدار Al2O3 و بالا بودن مقدار #Mg در ارتوپیروکسن‌ها و ترکیب فورستریتی (Fo85 تا Fo89) الیوین‌ها با مقدار پایین CaO در آنها نشان میدهد که ذوببخشی مهم‌ترین رخداد در تشکیل سنگ‌های فرامافیک این منطقه است و شکل‌گیری این سنگها از نظر زمینساختی با محیط فرورانشی مورب سازگار است.
واژه‌های کلیدی: افیولیت، سنگ‌های فرامافیک، هارزبورژیت، لرزولیت، صحرارود.
فهرست منابع
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