دوره 26، شماره 3 - ( 7-1397 )                   جلد 26 شماره 3 صفحات 733-750 | برگشت به فهرست نسخه ها


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Hajighorbani, Nasrabady M, Jamshidibadr M, Davoudi Z. Mineralogy, geochemistry and tectonic setting of amphibolites from Mahmoudabad metamorphic complex (SE Shahindezh). www.ijcm.ir. 2018; 26 (3) :733-750
URL: http://ijcm.ir/article-1-1155-fa.html
حاجی‌قربانی شبنم، نصرآبادی محسن، جمشیدی‌بدر محبوبه، داودی زینب. کانی‌شناسی، زمین‌شیمی و جایگاه زمین‌ساختی آمفیبولیت‌های مجموعه دگرگونی محمودآباد (جنوب‌شرق شاهین‌دژ). مجله بلورشناسی و کانی شناسی ایران. 1397; 26 (3) :733-750

URL: http://ijcm.ir/article-1-1155-fa.html


دانشگاه بین‌المللی امام خمینی(ره)
چکیده:   (195 مشاهده)
مجموعه دگرگونی محمودآباد بخشی از پهنه دگرگونی سنندج- سیرجان است که در جنوب­شرق شاهین­دژ برون­زد دارد. سنگ­های دگرگونی مجموعه محمودآباد اغلب متاپلیت بوده و برون­زدهای محدودی از متابازیت­های توده­ای و برگواره­دار در این مجموعه حضور دارند، که در این پژوهش متابازیت­های این مجموعه بررسی شده­اند. متابازیت­ها کانی­شناسی آمفیبول و پلاژیوکلاز را نشان می­دهند که معرف رخساره آمفیبولیت هستند. ترکیب شیمی پلاژیوکلاز از نوع آندزین و لابرادوریت و آمفیبول از نوع منیزیوهورنبلند و ترمولیت است. نتایج دما- فشارسنجی محاسبه شده به روش­های مختلف، دمای 430 تا 750 درجه سانتی­گراد و فشار 6 تا 13 کیلوبار را نشان می­دهند که تقریباً معادل شیب زمین­گرمایی 20 تا 25 درجه سانتی­گراد بر کیلومتر است. برپایه داده­های زمین­شیمیایی سنگ کل، آمفیبولیت­های مجموعه محمودآباد از نوع ارتوآمفیبولیت بوده و بیشتر ترکیب بازالتی دارند. شاخص­های زمین­شیمیایی این آمفیبولیت­ها با جایگاه زمین­ساختی پشت قوس قاره­ای همخوانی دارد. احتمالاً آمفیبولیت­های مجموعه محمودآباد، معرف فعالیت ماگمایی مافیک جایگاه پشت قوس قاره­ای ناشی از فرورانش حوضه اقیانوسی نئوتتیس به زیر سنگ­کره قاره­ای سنندج- سیرجان است که دستخوش دگرگونی کرانه فعال قاره­ای یا برخورد شده­اند.     
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نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي
دریافت: ۱۳۹۷/۷/۳ | پذیرش: ۱۳۹۷/۷/۳ | انتشار: ۱۳۹۷/۷/۳

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