تعیین سری ماگمایی و فوگاسیته اکسیژن سنگهای آتشفشانی میوسن- پلیوسن شرق کامو (شمال اصفهان) بر اساس شیمی بیوتیت

زمین شناسی اقتصادی

مقاله 5، دوره 6، شماره 1 - شماره پیاپی 10، مرداد 1393، صفحه 149-161   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v6i1.21362

نویسندگان

محمد سیاری^{* 1}؛ مرتضی شریفی¹؛ جمشید احمدیان²

¹اصفهان

²پیام نور واحد اصفهان

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.

کلیدواژه‌ها

بیوتیت؛ فوگاسیته اکسیژن؛ سنگهای آتشفشانی؛ ارومیه- دختر؛ کامو

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