نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه زمین‌شناسی، دانشکده علوم زمین، دانشگاه اصفهان، اصفهان، ایران

2 دانشجوی کارشناسی ارشد، گروه زمین‌شناسی، دانشکده علوم زمین دانشگاه شهید باهنر کرمان، کرمان، ایران

3 کارشناسی ارشد، نمایندگی سازمان زمین‌شناسی ایران در استان کهگیلویه و بویراحمد، یاسوج، ایران

چکیده

سازند آسماری توالی ستبر کربناته‌ای در حوضه فورلند زاگرس (جنوب باختر ایران) است که در زمان الیگوسن- میوسن پیشین نهشته شده است. سازند آسماری در برش دشتروم (۱۵ کیلومتری جنوب یاسوج) ستبرای 233 متر دارد. در این پژوهش ریزرخساره‌ها، محیط رسوبی و چینه‌نگاری زیستی سازند آسماری مورد بررسی قرار گرفته است. مطالعه روزن‌بران کف‌زی در این ناحیه به شناسایی 23 جنس و 32 گونه و مطالعه برش مورد نظر در مجموع به شناسایی سه مجموعه زیستی زیر انجامید:
1. Lepidocyclina-Operculina-Ditrupa assemblage zone
2. MiogypsinaElphidium sp., Peneroplis farsensis assemblage zone
3. Borelis melo curdica- Meandropsina iranica assemblage zone 
روزن‌بران شناسایی شده سن الیگوسن پیشین (روپلین- شاتین) تا میوسن پیشین (بوردیگالین) را برای سازند آسماری در منطقه مورد مطالعه پیشنهاد می‌کنند. بر پایه مطالعات آزمایشگاهی ۹ ریزرخساره آهکی در سه زیر محیط لاگون، سد و دریای باز شناسایی شد. نهشته‌های سازند آسماری در منطقه مورد مطالعه در یک سکوی کربناته دریایی اپی‌کانتیننتال از نوع رمپ هموکلینال رسوب‌گذاری کرده‌اند.
 

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