نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، گروه علوم زمین، دانشکده علوم، دانشگاه کردستان، سنندج، ایران
2 استاد، گروه معدن، دانشکده فنی و مهندسی، دانشگاه کردستان، سنندج، ایران
3 کارشناسی ارشد، گروه علوم زمین، دانشکده علوم، دانشگاه کردستان، سنندج، ایران
چکیده
توالی کرتاسه بالایی (UCS) در شمال پهنه سنندج-سیرجان، دربردارنده 5 واحد، به ستبرای2000 متر، شامل آهک، شیل، ماسه سنگ، کنگلومرای درون سازندی، و گدازه های بازالتی و آندزیتی است. این سنگها با ناپیوستگی بر روی نهشتههای کرتاسه پایینی و در زیر کنگلومرای پالئوسن جای دارند. الگوی عناصر نادر خاکی (REEs)، نسبتهای (22-18) Al2O3/TiO2،
(24/4-5/43) La/LuCN (2/53-0/51) ، LREEs/HREEs (Nd/ErCN > 5) ،La/Sc
(Th/Sc (0/42-0/68 و آنومالیهای منفی (0/89-0/26) * Eu/Eu و (0/82-0/14) * Nb/Nb نمونههای شیل UCS نشان میدهند که این نمونهها بطور عمده نابالغ، رسوبات چرخه اول ناشی از فرسایش سنگ‌های متوسط تا اسیدی کمان ماگمایی هستند. سنگ‌های آتشفشانی در هنگام ذوب بخشی درون پوسته‌ایی قطعه اقیانوسی دگرسان شده فرورونده در رخساره گارنت- آمفیبولیت فشار بالا پدید آمده‌اند.
ترکیب شیمیایی و تغییرات عمودی رخسارههای سنگی UCS، گویای تغییر محیط رسوبی در طی رسوبگذاری از دراز گودال به سراشیبی دراز گودال و حوضه جلوی کمان ماگمایی، ناشی از مهاجرت کمان ماگمایی به سوی قاره است. فعالیت آتشفشانهای کرتاسه پسین منجر به Upwelling آبهای احیایی، مرگ گروهی پلانکتونها، و تشکیل پیریت در رسوبات شده است. در نمودار Th/Yb-Ta/Yb جاگیری نمونهها در بازه‌های ACM و WPVZ ناشی از تحولات تکتونیکی از فرورانش با شیب کم به شرایط آتشفشانی کششی میباشد.
کلیدواژه‌ها
موضوعات
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