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رضوان مهوری مرتضی شریفی

چکیده

در منطقه علی­ آباد (شمال­ غرب نايين) سنگ­ های آتشفشانی با ترکيب آندزيت، تراکی­ آندزيت، داسيت و ريوليت به همراه سنگ­ های آذرآواری (توف) وجود دارند. از لحاظ کانی ­شناسی، اين سنگ­ ها از فنوکريست­ های پلاژيوکلاز، کلينوپيروکسن، سانيدين، بيوتيت، کوارتز و کانی­ های اوپک در زمين ه­ای از ميکروليت­ های پلاژيوکلاز، شيشه و کانی­ های اوپک تشکيل شده­ اند. کلينوپيروکسن اين سنگ­ ها از نوع اوژيت با ترکيب (En43-45, Wo 38-42, Fs 14-18) است. ترکيب شيميايی کلينوپيروکسن نشان می ­دهد که اين کانی در فشارهای کم تا متوسط تشکيل‌شده و بیانگر تبلور آنها در طی صعود ماگما و در عمق­ های مختلف است. توزيع Al و ميزان Fe+3 در ساختار کلينوپيروکسن بيانگر تبلور آن از يک ماگمای آبدار با فشار بخار آب 10 درصد و با فوگاسيته بالای اکسيژن است. بر اساس محاسبات زمين دما-­فشارسنجی، کلينوپيروکسن­ ها در محدوده دمايی 1009 تا 1200 درجه سانتی­ گراد، محدوده فشار حدود 5/2 تا 7 کيلوبار و عمق 9 تا 18 کيلومتری متبلور شده ­اند.

جزئیات مقاله

کلمات کلیدی

کلينوپيروکسن, دما-فشارسنجی, اروميه-دختر, علی آباد

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ارجاع به مقاله
مهوریر., & شریفیم. (2020). کاربرد شيمی‌ کانی کلينوپيروکسن در بررسی شرايط فيزيکی صعود ماگما، مطالعه موردی سنگ های آتشفشانی علی آباد، شمال غرب نايين. زمین‌شناسی اقتصادی, 11(4), 629-643. https://doi.org/10.22067/econg.v13i4.71157
نوع مقاله
علمی- پژوهشی