دوره 28، شماره 1 - ( 1-1399 )                   جلد 28 شماره 1 صفحات 199-216 | برگشت به فهرست نسخه ها


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Fazilat A, Sadeghian M. Investigation of mineralogical and microstructural changes of Chah Zard granites (East of Jandagh) during mylonitization: using anisotropy of magnetic susceptibility method (AMS). www.ijcm.ir. 2020; 28 (1) :199-216
URL: http://ijcm.ir/article-1-1428-fa.html
فضیلت آسیه، صادقیان محمود. بررسی تغییرات کانی‌شناسی و ریزساختی گرانیت‌های چاه‌زرد (شرق‌جندق) طی میلونیت‌زایی براساس روش ناهمسانگردی پذیرفتاری مغناطیسی (AMS). مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (1) :199-216

URL: http://ijcm.ir/article-1-1428-fa.html


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چکیده:   (241 مشاهده)
توده گرانیتی چاه­زرد با سن 2/3± 4/535 میلیون­سال (تعیین شده به روش  U-Pbبر روی زیرکن) به­ درون مجموعه دگرگونی جندق - عروسان نفوذ کرده و طی رخدادهای ­بعدی به­شدت میلونیتی­شده­است. این توده گرانیتی، برای نخستین بار براساس روش ناهمسانگردی پذیرفتاری مغناطیسی (AMS) بررسی شده است. مقدار میانگین پذیرفتاری مغناطیسی (Km) بیوتیت­گرانیت­ها (سازنده اصلی پیکره توده گرانیتی چاه زرد) µSI 112 است. بیوتیت مهمترین حامل ­مغناطیسی در بیوتیت­گرانیت­هاست. طی میلونیت­زایی، حجم قابل­توجهی از بیوتیت­ها به مسکوویت تحوّل پیدا کرده و در نتیجه، مقادیر Km سنگ­های دربرگیرنده آنها به شدت کاهش یافته است. خطواره­ها و برگواره­های مغناطیسی این توده گرانیتی به ترتیب، بیشتر دارای میل و شیب بسیار کمی هستند، شواهد صحرایی نیز این امر را تأیید می­کند. خطواره­های مغناطیسی، بیشتر به­سمت شمال­غرب آرایش یافته­اند. از آن­جا که شدت میلونیتی­شدن بسیار زیاد است، ریزساخت­های دستخوش تنش­های زمین­ساختی، بر ریزساخت­های ماگمایی غلبه پیدا کرده و آن­ها را به طور کامل مخدوش کرده­اند.
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نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي
دریافت: 1399/2/24 | پذیرش: 1399/2/24 | انتشار: 1399/2/24

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