ریزرخساره‌ها و چینه نگاری سکانسی سازند آسماری در برش تنگ سرخ، جنوب شرقی یاسوج

نوع مقاله : مقالات پژوهشی

نویسندگان

دانشگاه اصفهان

چکیده

سازند آسماری در برش تنگ سرخ با 294 متر ضخامت، شامل سنگ آهکهای نازک تا متوسط لایه و ضخیم لایه تا توده‌ای به همراه سنگ آهکهای مارنی می‌باشد. برش مورد مطالعه در شمال غرب فارس داخلی واقع شده است. بر طبق الگوهای عمیق و کم عمق شدگی ریزرخساره‌ها، یک بسته رسوبی فرازین و یک سکانس رسوبی درجه سوم از روپلین و دو سکانس درجه سوم (چاتین) تشخیص داده شد. مرزهای سکانسی به ترتیب به وسیله ریزرخساره‌های بایوکلاست ایمپرفوریت فرامینیفرا میلیولید پکستون، ماسه سنگ هیبرید ریز تا متوسط دانه، میکروکنگلومرای بایوکلاست‌دار و کنگلومرای آهکی تعیین شده‌اند. مرز بالایی سکانسهای اول و دوم توسط مرز نوع دو مشخص شده است، در حالی که این مرز در سکانسهای سوم و چهارم به صورت مرز نوع یک تعریف شده است.

کلیدواژه‌ها


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