شیمی کانی و زمین دما-‌فشارسنجی متابازیت های مجموعه آذرین-‌دگرگونی ماجراد (جنوب شرق شاهرود)

زمین شناسی اقتصادی

مقاله 6، دوره 11، شماره 4 - شماره پیاپی 23، 1398، صفحه 665-684   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v11i4.73682

نویسندگان

مرضیه ویس کرمی^{* 1}؛ محمود صادقیان¹؛ حبیب الله قاسمی¹؛ مینگو جای²

¹دانشگاه صنعتی شاهرود

²مؤسسه زمین شناسی و ژئوفیزیک آکادمی علوم چین

چکیده

مجموعه دگرگونی-‌آذرین ماجراد به سن نئوپروتروزوئیک ­پسین، در جنوب­شرق شاهرود و شمال پهنه ساختاری ایران­ مرکزی رخنمون دارد که طیف وسیعی از سنگ­ های آذرین و دگرگونی را شامل می ­شود. متابازیت ­های این مجموعه متشکل از آکتینولیت­شیست، آمفیبولیت و گارنت­آمفیبولیت هستند. آمفیبول، پلاژیوکلاز و گارنت کانی­ های اصلی این سنگ­ ها هستند. آمفیبول­ های متابازیت­ های این مجموعه به گروه­ کلسیم­ دار تعلق دارند. ترکیب آمفیبول­ در آکتینولیت­شیست­ ها آکتینولیت و منیزیوهورنبلند و در آمفیبولیت­ ها منیزیو‌هورنبلند و چرماکیت است. پلاژیوکلازها اغلب دارای ترکیب الیگوکلاز، لابرادوریت تا بیتونیت هستند. با استفاده از دما‌-‌فشارسنجی زوج هورنبلند‌-‌پلاژیوکلاز، دمای تعادلی 450 تا 690 درجه سانتی­ گراد و فشار 4 تا 11 کیلوبار برای آمفیبولیت ­های مجموعه آذرین‌-‌دگرگونی ماجراد برآورد شده است. این شرایط دما‌-‌فشار با شرایط رخساره آمفیبولیت در رژیم دگرگونی نوع بارروین متعارف مطابقت می­ کند.

کلیدواژه‌ها

: متابازیت؛ نئوپروتروزوئیک پایانی؛ آمفیبول؛ پلاژیوکلاز؛ شاهرود

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