دوره 28، شماره 3 - ( 7-1399 )                   جلد 28 شماره 3 صفحات 576-557 | برگشت به فهرست نسخه ها


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1- دانشگاه لرستان
2- دانشگاه فردوسی مشهد
3- دانشگاه زنجان
4- آکادمی علوم
چکیده:   (1786 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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نوع مقاله: پژوهشي | موضوع مقاله: تخصصي

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