دوره 28، شماره 4 - ( 10-1399 )
جلد 28 شماره 4 صفحات 1008-993 |
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Nazari, Tahmasbi, Ahmadi Khalaji. Petrology, geochemistry and minearal chemistry of volcanic rocks in the north of Kaboudarahang (Hamedan). www.ijcm.ir 2020; 28 (4) :993-1008
URL: http://ijcm.ir/article-1-1563-fa.html
URL: http://ijcm.ir/article-1-1563-fa.html
نظری طاهره، طهماسبی زهرا، احمدی خلجی احمد. سنگ‌شناسی، زمین‌شیمی و شیمی‌کانی سنگهای آتشفشانی شمال کبودرآهنگ (همدان). مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (4) :993-1008
طاهره نظری1 
، زهرا طهماسبی*1 ، احمد احمدی خلجی1
، زهرا طهماسبی*1 ، احمد احمدی خلجی1
1- دانشگاه لرستان
چکیده: (1882 مشاهده)
سنگهای آتشفشانی شمال کبودرآهنگ با ترکیب آندزیت و تراکی آندزیت به سن ائوسن در پهنه ارومیه-دختر بصورت ستونهای منشوری عمودی رخنمون یافتهاند. این سنگها دارای درشت بلورهایی از آمفیبول و پلاژیوکلاز با بافت پورفیری، گلومروپورفیری و ریزسنگی هستند. شواهد زمین شیمیایی نشان میدهد که این سنگها از سری ماگمایی آهکی قلیایی هستند و از نظر محیط زمینساختی در کرانههای فعال قارهای وابسته به قوس تشکیل شدهاند که میتواند با فروررانش اقیانوس نئوتتیس به زیر ایران مرکزی مربوط باشد. همچنین، الگوی عناصر خاکی نادر و نمودارهای عنکبوتی بهنجار شده، غنیشدگی از عناصر خاکی نادر سبک (LREE) و عناصر سنگ دوست بزرگ یون (LILE) در مقایسه با عناصر با شدت میدان بالا (HFSE) و عناصر خاکی نادر سنگین (HREE) را نشان میدهند که از شواهد محیطهای فرورانشی است. بر اساس نتایج به دست آمده از شیمی کانی آمفیبولها مشخص شد که این کانیها در گسترهی آمفیبولهای کلسیمی و از نوع منیزیوهورنبلند تا چرماکیت بوده و وابسته به کرانههای فعال قارهای هستند که با نتایج سنگ میزبان همخوانی دارد. براساس محاسبات دما فشارسنجی، این آمفیبولها در دمای تعادلی 5/815 درجه سانتیگراد و فشار 35/6 کیلوبار تشکیل شدهاند. گریزندگی بالای به دست آمده برای این سنگها نشان دهنده شرایط اکسایشی در پیدایش این سنگها و گواهی بر پیدایش آنها در مرز صفحههای همگراست.
واژه‌های کلیدی: آمفیبول، دما فشارسنجی، آندزیت، ائوسن، قوس آتشفشانی، کبودرآهنگ.
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