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Pourmohammad, Ahmadi Khalaji, Homam, Ebrahimi, Esmaeili, Tahmasebi. Mineral chemistry and geothermobarometry of the metapelites of Geysour metamorphic complex, east of Gonabad. www.ijcm.ir 2020; 28 (3) :557-576
URL: http://ijcm.ir/article-1-1513-fa.html
URL: http://ijcm.ir/article-1-1513-fa.html
پورمحمد عبدالصمد، احمدی‌خلجی احمد، همام سید مسعود، ابراهیمی محمد، اسمعیلی رسول، طهماسبی زهرا. شیمی کانی و زمین دما-فشارسنجی سنگهای رسی دگرگون شده مجموعه دگرگونی گیسور، شرق گناباد. مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (3) :557-576
عبدالصمد پورمحمد1 
، احمد احمدی‌خلجی* 1، سید مسعود همام2 ، محمد ابراهیمی3 ، رسول اسمعیلی4 ، زهرا طهماسبی1
، احمد احمدی‌خلجی* 1، سید مسعود همام2 ، محمد ابراهیمی3 ، رسول اسمعیلی4 ، زهرا طهماسبی1
1- دانشگاه لرستان
2- دانشگاه فردوسی مشهد
3- دانشگاه زنجان
4- آکادمی علوم
2- دانشگاه فردوسی مشهد
3- دانشگاه زنجان
4- آکادمی علوم
چکیده: (2008 مشاهده)
منطقه گیسور در شرق شهرستان گناباد، بخشی از شمال قطعه لوت محسوب میشود. سنگهای این منطقه شامل سنگهای گرانیتوئیدی و مجموعه دگرگونی هستند. در سنگهای متاپلیتی (رسی دگرگونه) این منطقه وجود شیستوارگی S1 و کانی کلریتوئید شاخص دگرگونی ناحیهای است و به عنوان شواهد دگرگونی مجاورتی میتوان به وجود بافتهای تصادفی در کانیهای آندالوزیت، استارولیت، مسکوویت؛ گارنتِ پس از زمین ساخت و رشد سیلیمانیت منشوری به درون لبه آندالوزیت اشاره کرد. گارنت دارای دو مرحله رشد بوده و بیشتر دارای اعضای پایانی آلماندین، گروسولار و اسپسارتین است. کلریتوئید و استارولیت از نوع آهندار هستند. مسکوویت کمی جایگزینی از نوع پاراگونیت دارد. کلریتی شدن بیوتیت و گارنت، سریسیتی شدن آندالوزیت و بروز ریزترکهای شعاعی در گارنت همه نشان دهنده یک دگرگونی پسرونده و بالاآمدگی هستند. براساس روشهای زمین دما-فشارسنجی مرسوم، دما و فشار این مجموعه دگرگونی در گسترههای oC 608 – 550 و kbar 5/4 - 8/3 برآورد شدند. وجود ریزترکهای شعاعی پیرامون میانبارهای کوارتز در گارنت ناشی از یک مؤلفه بزرگ کاهش فشار همدماست.
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