مقایسه چینه نگاری سکانسی و محیط رسوبی سازند آسماری در نواحی فارس، خوزستان و لرستان از حوضه زاگرس

نوع مقاله : مقالات پژوهشی

نویسندگان

1 دانشگاه فردوسی مشهد

2 دانشگاه اصفهان

چکیده

سازند آسماری توالی ضخیم کربناته ای در حوضه فورلند زاگرس می باشد که در زمان الیگوسن ـ میوسن پیشین نهشته شده است. به منظور تفسیر محیط رسوبی و چینه نگاری سکانسی، برش فیروزآباد با 4 برش از سازند آسماری در حوضه زاگرس مورد مقایسه قرار گرفته است. بررسی ریزخساره های موجود نشان دهنده چهار زیرمحیط رسوبی مختلف شامل پهنه جزرومدی، لاگون، پشته و دریای باز در سازند آسماری می باشد. این محیطهای رسوبی قابل تطابق با بخشهای رمپ داخلی، میانی و خارجی هستند. در برش فیروزآباد دو سکانس رسوبی درجه 3 بر اساس الگوهای عمیق و کم عمق شدگی ریزرخساره ها و الگوهای پراکندگی روزن داران الیگوسن تشخیص داده شد. این سکانسها با سکانسهای شناسایی شده در برشهای دهلران، معمولان، دیل و تنگ آب جهرم تطابق داده شدند.

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