دوره 26، شماره 3 - ( 7-1397 )                   جلد 26 شماره 3 صفحات 635-650 | برگشت به فهرست نسخه ها


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Aliani F, Daraeezadeh Z. Mineral chemistry of isotropic gabbros from the Kermanshah ophiolite: Evidence for it's tectonic setting. www.ijcm.ir. 2018; 26 (3) :635-650
URL: http://ijcm.ir/article-1-1147-fa.html
آلیانی فرهاد، دارایی‌زاده زینب. شیمی کانی گابروهای همسانگرد افیولیت کرمانشاه، شواهدی بر خاستگاه زمین‌ساختی. مجله بلورشناسی و کانی شناسی ایران. 1397; 26 (3) :635-650

URL: http://ijcm.ir/article-1-1147-fa.html


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چکیده:   (60 مشاهده)
 گابروهای همسانگرد افیولیت کرمانشاه شامل طیفی از گابرو، الیوین گابرو، گابرو نوریت، الیوین گابرو نوریت و تروکتولیت هستند که بیشتر متوسط­بلور هستند و از کلینوپیروکسن، پلاژیوکلاز، ارتوپیروکسن، الیوین و به مقادیر کم آمفیبول تشکیل شده­اند. کلینوپیروکسن­ها با ترکیب اوژیت ـ دیوپسید ((91/50-79/45)En، (409/7-638/3) Fsو (47/48-81/43)) Woغنی از کلسیم و فقیر از سدیم (Na2O کمتر از 54/0 درصد وزنی)، با مقدار نسبتاً بالای Mg# (62/85 تا 35/89) و اندک Ti (TiO2 کمتر از 28/0 درصد وزنی) مشخص می­شوند. پلاژیوکلازها بیشتر از نوع بیتونیتی هستند و ترکیب آنها از آنورتیت غنی است ((15/90-51/70) An، (02/29-62/9) Ab و (63/0-00/0)Or). مؤلفه فورستریتی الیوین­ها در گستره 82/84-07/80 تغییر می­کند. اغلب ارتوپیروکسن­ها ترکیب انستاتیتی دارند و گستره ترکیبی آنها ( (94/84-27/78) En، (07/20-0/13) Fs و (36/3-43/1)Wo) است. آمفیبول­ها از منیزیم غنی هستند (ترمولیت، اکتینولیت و منیزیوهورنبلند) و Mg# آنها در گستره 35/64 تا 86/84 تغییر می­کند. وجود الیوین­ها و پیروکسن­های با منیزیم بالا، پلاژیوکلازهای کلسیک و نیز وجود کانی آمفیبول در گابروها نشان دهنده تشکیل آنها در محیط زمین­ساختی مربوط به فرورانش است. نمودارهای تعیین خاستگاه زمین­ساختی کلینوپیروکسن­ها، ویژگی­های شاخص جزایر کمانی خاستگاه ماگما را نشان می­دهند. براساس نتایج، افیولیت کرمانشاه در محیط پهنه ابرفرورانشی در شاخه جنوبی نئوتتیس تشکیل شده است.      
متن کامل [PDF 5411 kb]   (32 دریافت)    
نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي
دریافت: ۱۳۹۷/۷/۲ | پذیرش: ۱۳۹۷/۷/۲ | انتشار: ۱۳۹۷/۷/۲

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