یافته های جدیدی از چینه نگاری سکانسی سازند روته در شمال البرز مرکزی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده علوم، دانشگاه لرستان، خرم آباد، ایران

2 گروه حوضه های رسوبی و نفت، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران

3 شرکت پاسارگاد، تهران، ایران

چکیده

در مقطع شمال البرز مرکزی ، سازند روته با ضخامت 642 متر متشکل از سنگ آهک، سنگ آهک دولومیتی و شیل به طور ناپیوسته بر روی سازند درود و زیر سازند نسن قرار می گیرد. بر پایه مطالعات پتروگرافی 200 مقطع نازک، 18 ریز رخساره کربناته و یک رخساره آواری در قالب 4 کمربند رخساره ای پهنه جزر و مدی، کولاب، پشته های ماسه ای زیر آبی و دریای باز در این سازند شناسایی و تفکیک شده است. محیط رسوبی سنگ های پرمین میانی و پسین در ناحیه البرز شباهت فراوانی با محیط های کربناته عهد حاضر همانند خلیج فارس دارند. این نهشته ها در محیط های کم عمق در پلت فرم های حاشیه قاره ای تشکیل شده اند. محیط رسوبی سازند روته یک رمپ هموکلینال تشخیص داده شده است. مطالعات چینه نگاری سکانسی بر اساس تعیین دقیق محیط های رسوبی و بررسی های صحرایی صورت گرفته است. بر این اساس یک سکانس رده سوم به سن مورگابین پسین، سه سکانس رده سوم به سن میدین پیشین، میانی و پسین و دو سکانس رده سوم به سن جولفین پیشین و پسین تعیین شده است.

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