بررسی فرایندهای میگماتیت زایی و گرانیت های لوکوکرات در منطقه تویسرکان، همدان

زمین شناسی اقتصادی

مقاله 2، دوره 12، شماره 1 - شماره پیاپی 24، بهار 1399، صفحه 23-45  

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v12i1.75143

نویسندگان

معصومه زارع شولی¹؛ زهرا طهماسبی ¹؛ عادل ساکی²؛ احمد احمدی خلجی¹

¹دانشگاه لرستان

²دانشگاه شهید چمران اهواز

چکیده

در مجاورت توده پلوتونیکی الوند، انواع سنگ­ های دگرگونی ناحیه ­ای و مجاورتی درجه پایین تا بالا وجود دارد. نفوذ توده مافیک باتولیت الوند در سنگ‌ های رسی دگرگون‌شده (شیست­ ها) سبب ایجاد هورنفلس­ های رسی و میگماتیت­ های آناتکسی در هاله دگرگونی خود شده است. پدیده ذوب‌بخشی در هاله همبری الوند فقط در سنگ­ های با ترکیب رسی رخ‌داده است. مشاهده­ های صحرایی، بررسی­ های میکروسکوپی و داده­ های ژئوشیمیایی نشان می­ دهد که در منطقه مورد بررسی میگماتیت­ ها از ذوب‌بخشی هورنفلس­ ها حاصل شده‌اند. اختلاف قابل‌توجه در مقادیر عناصر نادر خاکی و الگوی REE گرانیت­ های لوکوکرات و لوکوسوم ­های میگماتیت نشان می‌دهد که ارتباط ژنتیکی بین میگماتیت­ ها و گرانیت­ های هم‌جوار وجود ندارد و نفوذ گرانیت­ های لوکوکرات بعد از حادثه میگماتیتی‌شدن رخ‌داده است. این نشان‌دهنده آن است که آناتکسی و ذوب‌بخشی به‌دلیل حرارت ناشی از توده­ های گرانیتی نیست؛ بلکه گرمای حاصل از توده­ های مافیک قدیمی­ تر (گابرودیویت­ ها) عامل اصلی پدیده ذوب‌بخشی و میگماتیتی‌شدن در منطقه است. این یافته­ ها با داده ­های سن‌سنجی توده پلوتونیکی الوند و سنگ­ های میگماتیتی پیرامون آنها همخوانی دارد.

کلیدواژه‌ها

سنگ های میگماتیتی؛ ذوب بخشی؛ گرانیت لوکوکرات؛ تویسرکان؛ همدان؛ زون سنندج سیرجان

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