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آرزو مرادی ناهید شبانیان بروجنی علیرضا داودیان دهکردی

چکیده

توده گرانیت- گنایس میلونیتی شمال شرق معدن ژان، جزئی از مجموعه ماگمایی- دگرگونی شمال غرب شهرستان ازنا در استان لرستان و در پهنه ساختاری سنندج- سیرجان واقع شده است. این مجموعه ماگمایی- دگرگونی شامل گرانیت- گنایس ، آمفیبولیت ، مرمر و شیست است. گرانیت‌- گنایس مورد بررسی، دارای بافت اصلی لپیدوگرانوبلاستیک و کانی‌های اصلی کوارتز، آلکالی فلدسپار (میکروکلین پرتیتی)، پلاژیوکلاز، کانی‌های فرعی مسکویت فنژیتی، اپیدوت (ماگمایی)، آلانیت، تورمالین، زیرکن، اسفن و کانی متداول بیوتیت است. این توده گرانیتوئیدی از نظر ژئوشیمیایی پرآلومین تا کمی متاآلومین، کالک آلکالن تا حدودی آلکالن بوده و در موقعیت زمین‌ساختی پس از برخورد در حاشیه فعال قاره واقع شده است. در نمودار SNX در برابر SNY در دو محدوده هم‌زمان با دگرشکلی و مراحل پایانی دگرشکلی هم‌پوشانی دارند و از نوع آلکالن- کلسیک هستند. این توده گرانیتوئیدی دارای ماهیت A-type است و در زیرگروه A2 قرار می‌گیرد.

جزئیات مقاله

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ارجاع به مقاله
مرادی آ., شبانیان بروجنی ن., & داودیان دهکردی ع. (2017). ژئوشیمی توده گرانیت- گنایس میلونیتی تورمالین‌ دار شمال شرق معدن ژان، استان لرستان. زمین‌شناسی اقتصادی, 9(1), 141-158. https://doi.org/10.22067/econg.v9i1.37117
نوع مقاله
علمی- پژوهشی