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

رخساره‌های رسوبی

مقاله 1، دوره 7، شماره 1، شهریور 1393، صفحه 1-18   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/sed.facies.v7i1.16319

نویسندگان

سیده زهرا ابطحی فروشانی^* ؛ علی صیرفیان

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

سازند آسماری؛ سکانس رسوبی؛ مرزسکانسی؛ جنوب شرقی یاسوج

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