نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

2 دانشیار، گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

3 استاد، گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

چکیده

میگماتیت‌های قره‌ناز در نتیجه ذوب بخشی آمفیبولیت‌ها تحت شرایط رخساره گرانولیت تشکیل شده‌اند. شواهد ساختی، بافتی، کانی شناسی و ژئوشیمیایی در میگماتیت‌های منطقه بیانگر تشکیل میگماتیت‌ها در طی ذوب بخشی می‌باشد. میگماتیت‌های مورد مطالعه دارای انواع متنوعی از ساختارها شامل لکه‌ای، شولن، افتالمیتیک، استروماتیک، دیکتیونیتیک، پتیگماتیت، فلبیتیک، شلیرن، پگماتیتوییدی و نبولیتیک می‌باشند. وجود پلاژیوکلازهای شکل‌دار و کوارتزهای بی‌شکل به صورت بین دانه‌ای به همراه تشکیل بافت گرانولار، میرمکیت و پرتیت در بخش‌های لوکوسوم و همچنین وجود زونینگ، ماکل پلی‌سنتتیک در پلاژیوکلازها بیانگر نقش ذوب بخشی در تشکیل میگماتیت‌ها بوده است. بر اساس محاسبات تعادل جرمی در میگماتیت‌های قره‌ناز ترکیبات اجزای میگماتیتی لوکوسوم، ملانوسوم و مزوسوم در راستای خطی مستقیم قرار می‌گیرند که نشانه‌ای بر منشا ذوب‌بخشی میگماتیت‌های مورد مطالعه باشد. درصد ذوب بخشی برای میگماتیت‌های مطالعه شده به روش تعادل جرمی در حدود f≈36.5% و f≈43.6% محاسبه شده است. تفاوت در درصدهای ذوب بخشی ممکن است وابسته به روابط بین نرخ و خروج مذاب از ناحیه ذوب و به مقدار اندک وابسته به میزان واتنش در منطقه می‌باشد. دمای تشکیل این میگماتیت‌ها در حدود 870-850 درجه سانتی‌گراد و فشار در حدود 7-6 کیلوبار تعیین شده است.

کلیدواژه‌ها

موضوعات

کتابنگاری

باباخانی، ع. و قلمقاش، ج.، 1371- نقشه زمین شناسی 100000/1 تخت سلیمان، سازمان زمین شناسی ایران.

بخشی‎زاد، ف. و قربانی، ق.، 1394- ژئوشیمی، ژئوکرونولوژی و محیط تشکیل سنگ های دگرگونی منطقه زنجان- تکاب، فصلنامه علوم زمین، سال بیست و پنجم (پاییز)، شماره 97، 361-374 ص. https://www.sid.ir/fa/journal/ViewPaper.aspx?id=264816..

 

 

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