دوره 25، شماره 4 - ( 10-1396 )                   جلد 25 شماره 4 صفحات 697-710 | برگشت به فهرست نسخه ها


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Ahangari M. Origin of tourmaline and garnet in west Qushchi mylonite granite (NW Iran); constrains on petrogenesis of parental rock . www.ijcm.ir. 2018; 25 (4) :697-710
URL: http://ijcm.ir/article-1-989-fa.html
آهنگری معصومه. بررسی خاستگاه تورمالین و گارنت در میلونیت‌گرانیت‌های غرب قوشچی- شمال‌غرب ایران؛ تعیین سنگ‌زایی سنگ اولیه. مجله بلورشناسی و کانی شناسی ایران. 1396; 25 (4) :697-710

URL: http://ijcm.ir/article-1-989-fa.html


دانشگاه ارومیه
چکیده:   (669 مشاهده)
میلونیت­گرانیت­های مورد بررسی در پژوهش حاضر به صورت توده­های کوچکی در منطقه غرب قوشچی واقع در استان آذربایجان­غربی رخنمون یافته­اند. ارتوکلاز، میکروکلین، پلاژیوکلاز، مسکویت­های ماهی­شکل، تورمالین ± گارنت پورفیروکلاست­های این سنگ­ها را تشکیل می­دهند. کوارتزهای باز تبلور یافته، مسکویت­های ریزدانه به همراه اندکی اپیدوت کانی­های موجود در زمینه را تشکیل می­دهند. بررسی سنگ­شناسی، تصاویر BSE و شیمی­کانی­های تورمالین و گارنت بیانگر وجود منطقه­بندی ترکیبی در این کانی­ها است. مطالعه شیمی­کانی قسمت مرکزی این کانی­ها نشاندهنده خاستگاه ماگمایی برای آن­ها است. در حالیکه کناره­ها به­ویژه در گارنت دارای خصوصیات دگرگونی است. حضور مجموعه کانیایی تورمالین + مسکویت ± گارنت غنی از منگنز در میلونیت­گرانیت­های غرب قوشچی و نیز رخنمون این سنگ­ها به صورت توده­های کم حجم درون سنگ­های رسوبی دگرگون شده بیانگر تشکیل این مجموعه در اثر جدایش مقدار اندک گدازه در طی ذوب بخشی درجه پایین سنگ­های دگرگونی است. بر اساس مجموعه کانیایی موجود در سنگ­های مورد بررسی بنظر می­رسد که این سنگ­ها از نوع لویکوگرانیت­های پرآلومینوس با مقادیر اندک منیزیم هستند.     
متن کامل [PDF 6937 kb]   (157 دریافت)    
نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي
دریافت: ۱۳۹۶/۹/۴ | پذیرش: ۱۳۹۶/۹/۴ | انتشار: ۱۳۹۶/۹/۴

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