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محمد سیاری مرتضی شریفی جمشید احمدیان

چکیده

سنگهای آتشفشانی مورد مطالعه در بخش میانی کمان ماگمایی ارومیه- دختر قرار گرفته و بخشی از ایالت ماگمایی واقع در شمال زمیندرز بیتلیس- زاگرس، محسوب می گردند. این سنگها متشکل از درشت‌بلورهای آمفیبول، پلاژیوکلاز و بیوتیت می‌باشند که در زمینه‌ای از فلدسپار، کوارتز، کانیهای اوپاک، شیشه و میکرولیت قرار دارند و عمدتاً دارای بافت پورفیریتیک هستند و در محدوده داسیت تا آندزیت قرار می‌گیرند. کانیها عمدتاً سالم هستند و آثار دگرسانی محدود به کلریتی‌شدن ضعیف برخی آمفیبول ها و سوسوریتی‌شدن حاشیه برخی پلاژیوکلازهااست. بیوتیت های مورد آنالیز در سنگهای آتشفشانی میوسن- پلیوسن شرق کامو، همگی از نوع بیوتیت های غنی از منیزیوم بوده و بر اساس تقسیم‌بندی جامع میکاها به 6 عضو پایانی کلی، به‌طور متوسط از 45/55 درصد فلوگوپیت، 90/15 درصد تالک، 72/12 درصد تیتان- فلوگوپیت، 44/11 درصد ایستونیت، 71/3 درصد فری ایستونیت و 78/0 درصد موسکیت، تشکیل شده اند. ترکیب بیوتیت ها، سری کالک‌آلکالن را برای ماگمای مادر نشان می‌دهد. برآورد فوگاسیته اکسیژن ماگما بر اساس ترکیب و محتوای +3Fe بیوتیت، نشان می‌دهد که فوگاسیته اکسیژن در زمان تبلور بیوتیت ها به‌صورت کیفی در حد بافر FMQ و به‌صورت کمی حدود 15-10 بار بوده است. این تخمین با فوگاسیته اکسیژن سنگهای آتشفشانی حدواسط تا اسیدی مطابقت نشان‌ می‌دهد.

جزئیات مقاله

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ارجاع به مقاله
سیاریم., شریفیم., & احمدیانج. (۱۳۹۳-۰۵-۱۰). تعیین سری ماگمایی و فوگاسیته اکسیژن سنگهای آتشفشانی میوسن- پلیوسن شرق کامو (شمال اصفهان) بر اساس شیمی بیوتیت. زمین‌شناسی اقتصادی, 6(1), 149-161. https://doi.org/10.22067/econg.v6i1.21362
نوع مقاله
علمی- پژوهشی