نوع مقاله : مقاله پژوهشی
نویسنده
گروه زمین‌شناسی، دانشکده علوم، دانشگاه محقق اردبیلی، اردبیل، ایران
چکیده
در محدوده شمال اردبیل (از نمین تا لاهرود) توالی متنوع و گسترده‌ای از فعالیت‌های ماگمایی بازی تا حدواسط و اسیدی از ائوسن تا کواترنری رخنمون دارند. ترکیبات سنگی در این منطقه از گدازه‌های عمدتاً بازالتی همراه با گنبدهای داسیتی و ریولیتی در محدوده نمین تا بازالت و آندزیت بازالتی در محدوده لاهرود متغیر است. بررسی ترکیب شیمیایی الیوین در الیوین بازالت‌ها نشان‌دهنده ترکیب فورستریتی آنها از 67/8 تا 92/7 است. همچنین کلینوپیروکسن‌ها از نوع دیوپسیدی بوده و پلاژیوکلازها ترکیب لابرادوریتی تا بیتونیتی دارند. بیگانه‌بلورهای (زنوکریست‌ها) گارنت موجود در گنبدهای ریولیتی از نوع آلماندین می‌باشند. بررسی عناصر نادر خاکی در جریان‌های گدازه‌ای، قطعات سنگی و همچنین گنبدهای داسیتی- ریولیتی منطقه نشانگر غنی‌شدگی در عناصر نادر خاکی سبک به سنگین است. سنگ‌های مافیک-حدواسط منطقه سرشت شوشونیتی و برخی نیز کالک-آلکالن با پتاسیم بالا و گنبدهای داسیتی و ریولیتی سرشت آداکیتی نشان می‌دهند. ویژگی‌های ژئوشیمیایی و ایزوتوپی سنگ‌های بازالتی-آندزیتی منطقه شمال اردبیل-لاهرود نشان‌دهنده تشکیل آنها از ذوب بخشی یک گوه گوشته‌ای متاسوماتیسم شده توسط رسوبات و سیالات حاصل از ورقه فرورانده در زون فرورانشی ایران طی ائوسن است. همچنین ویژگی‌های ژئوشیمیایی و ایزوتوپی گنبدهای داسیتی-ریولیتی میوسن نشان‌دهنده منشأ گرفتن آنها از ذوب بخشی بخش‌های زیرین پوسته قاره‌ای ستبر شده ایران می‌باشد.
کلیدواژه‌ها
موضوعات
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