نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تهران، پردیس علوم، دانشکده زمین‌شناسی، تهران، ایران

2 مدیریت اکتشاف شرکت ملی نفت ایران، تهران، ایران

چکیده

به منظور شناسایی گونه‌های مختلف اربیتولینای موجود در سازند داریان و تعیین سن آنها، از آهک‌های بخش بالاییسازند داریان در برش دشتک نمونه‌برداری شد. بر اساس اندازه، شکل و پیچیدگی حجره جنینی اربیتولینا، پنج گونه متعلق به زیر جنس Mesorbitolina شامل Orbitolina (Mesorbitolina) lotzei, Orbitolina (M.) parva,Orbitolina (M.) texana, Orbitolina (M.) subconcava, Orbitolina (M.)sp. cf .M. perviaشناسایی و توصیف شد. با توجه به گونه‌های شناسایی شده و بررسی‌های انجام شده بخش بالایی سازند داریان انتهای آپتین پیشین-آپتین پسین late early Aptian-late Aptian)) تعیین سن شد. در این بررسی مرز آپتین پیشین و پسین (early/late Aptian) بر اساس پیدایش O. (M.) parvaمشخص می شود.
 

کلیدواژه‌ها

 
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