نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکترا، دانشکده علوم پایه، بخش زمین‌شناسی، دانشگاه تربیت مدرس، تهران، ایران
2 دانشیار، دانشکده علوم پایه، بخش زمین‌شناسی، دانشگاه تربیت مدرس، تهران، ایران
3 استاد، دانشگاه زمین شناسی چین، دانشکده تحقیقات علوم زمین، ووهان، چین
چکیده
سنگ‌های آتشفشانی مافیک کهک در قسمت مرکزی قوس ماگمایی ارومیه-دختر شامل بازالت و آندزیت بازالت هستند و ویژگی ماگماهای ساب آلکالن تا تحولی نشان می‌دهند. این سنگ‌ها براساس ایندکس تولئیتی (THL) به سری کالک آلکالن تعلق دارند. سن سنجی U-Pb زیرکن، برای سنگ‌های آندزیت-بازالتی و بازالتی منطقه به ترتیب سنهای تقریبی60 (پالئوسن میانی) و 24 تا 19 میلیون سال (الیگوسن پسین-میوسن آغازی) را تعیین می‌کند. این سنگ‌ها در نمودارهای عنکیوتی با غنی‌شدگی LREE وLILE و تهی‌شدگی HFSE با آنومالی نسبتا منفی یا نبود آنومالی Eu و الگویی شبیه E-MORB مشخص می‌شوند که بیانگر ماگماتیسم مرتبط با فرورانش صفحه اقیانوسی نئوتتیس به زیر ایران مرکزی می باشد. بر اساس ویژگی‌های پتروگرافی، ژئوشیمیایی و ایزوتوپی ، تبلور تفریقی نقش قابل توجهی در تحول ماگمای تشکیل دهنده این سنگ‌ها ایفا کرده است. مدلسازی عناصر کمیاب نشان می‌دهد که این سنگ‌ها از ذوب بخشی یک گوشته‌ای اسپینل لرزولیتی حاصل شده‌اند. نسبت‌های ایزوتوپی نیز نشان می‌دهند که ماگمای تشکیل دهنده سنگ‌های مورد مطالعه از ذوب بخشی گوشته لیتوسفری حاصل شده‌اند که توسط سیالات مشتق شده از اسلب فرورونده متاسوماتیزم شده‌اند. این سنگ‌ها در محیطی کششی و تحت شرایط انتقال از قوس به حوضه پشت قوس طی پالئوسن به میوسن تشکیل شده‌اند.
کلیدواژه‌ها
موضوعات
کتابنگاری
قلمقاش، ج.، بحرودی، ع.، فنودی، م.، باباخانی، ع.ر. و امامی، م.ه.، 1374- نقشه 1:100000 کهک، سازمان زمین شناسی و اکتشافات معدنی کشور.
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