پترولوژی و ژئو‌شیمی سنگ‌های آتشفشانی جنوب ماهین در پهنه ماگمایی طارم – هشتجین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی دانشگاه آزاد اسلامی واحد طبس

2 شرکت صنایع مس طارم

10.22055/aag.2022.39529.2264

چکیده

روستای ماهین در پهنه‌ی البرز- آذربایجان و زیر پهنه‌ی ماگمایی - فلززایی طارم - هشتجین قراردارد. بر اساس مطالعات سنگ‌نگاری، در محدوده جنوب ماهین رخنمون سنگ‌های محدوده شامل آندزیت، تراکی‌آندزیت، آندزیت‌ ‌بازالتی، پیروکسن آندزیت، آذرآواری و گابروی پورفیری است که متأثر از فرایند دگرسانی هستند. در مطالعات ژئو‌شیمیایی، سنگ‌های آتشفشانی در محدوده‌های بازالت، آلکالی بازالت، آندزیت، آندزیت بازالتی واقع می‌شوند و در سری‌های ماگمایی کالـک آلکـالن، کالک آلکالن پتاسیم بالا تا شوشونیت قرار می‌گیرند؛ بنابراین ماگمای اولیه دارای ماهیت قلیایی بوده، آمفیبول و به‌طور عمده فلوگوپیت در منشأ مذاب اولیه وجود داشته است. بر این اساس، ماگمای اولیه احتمالاً در اعماق حدود 70 کیلومتری تشکیل‌شده است. ماهیت کالک‌آلکالن پتاسیم بالا تا شوشونیتی‌، کاهش میزان عناصر HFSE بویژه Zr ‌، نسبت‌های بالای Nb/U، ‌Th/U،Ba/Nb، Nb/Th و پایین بودن نسبت Ce/Pb و نتایج حاصل از نمودار‌های مطالعه شده‌، وجود کمان قاره‌ای فعال را تائید می‌کنند. شواهد جزایر قوسی در بعضی از نمودارها و نیز همراهی و هم‌زمانی سنگ‌های آذرین با توفیت‌ سبز و سنگ‌های رسوبی در محدود‌ه و مجاور آن‌، بر وجود حوضه پشت‌کمانی قاره‌ای صحه می‌گذارند. با توجه به شواهد موجود احتمالاً در منطقه به‌طور هم‌زمان کمان قاره‌ای نرمال فعال و حوضه پشت‌کمانی قاره‌ای وجود داشته است.

کلیدواژه‌ها

موضوعات


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