زیست چینه‌نگاری سازند آسماری در شمال غرب شیراز (تنگ جلاب) بر پایه‌ی روزن‌بران کف‌زی بزرگ

نوع مقاله : مقاله پژوهشی

نویسنده

گروه زمین‌شناسی، واحد بندرعباس ، دانشگاه آزاد اسلامی ، بندرعباس ، ایران

چکیده

ﺳﺎزﻧﺪ ﮐﺮﺑﻨﺎﺗﻪ آﺳﻤﺎری به عنوان مهمترین سنگ مخزن نفت در حوضه زاگرس شناخته می‌شود. این سازند شامل ﺗﻮاﻟﯽ رسوبی ﺿﺨﯿمی است ﮐﻪ از اﻟﯿﮕﻮﺳﻦ تا ﻣﯿﻮﺳﻦ ﭘﯿﺸﯿﻦ ﻧﻬﺸﺘﻪ ﺷﺪه اﺳﺖ. ﺑﻪ ﻣﻨﻈﻮر مطالعه چینه‌نگاری زیستی سازند آسماری ﯾﮏ ﺑﺮش ﭼﯿﻨﻪ‌نگاری از این سازند در تنگ جلاب واقع در شمال غربی ﺷﻬر شیراز (جنوب صدرا) اﻧﺘﺨﺎب گردید و در مجموع ۲۱۴ متر از رسوبات این سازند مورد بررسی قرار گرفت. با مطالعه ۸۰ مقطع میکروسکوپی، در مجموع ۴۶ جنس و ۳۲ گونه از روزنبران شاخص شناسایی گردید و بر اساس آنها دو زیست زون تجمعی به شرح زیر تشخیص داده شد
1. Nummulites vascus, Nummulites fichteli, Nummulites intermedius AssemblageZone
2. Archias asmaricus, Archias hensoni, Miogypsinoides complanatus Assemblage Zone
زون‌های یاد شده سن سازند آسماری را برابر اُلیگوسن پیشین تا پسین (روپلین-شاتین) نشان داده‌اند.

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