مزاربیتولیناهای (Mesorbitolinas) سازند داریان در برش چینه‌شناسی دشتک، شمال شیراز

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


عنوان مقاله [English]

Mesorbitolinas of Dariyan Formation in Dashtak stratigraphic section,North of Shiraz

نویسندگان [English]

  • F. Safari 1
  • M. Yazdi-Moghadam 2
  • F. Sajjadi 1
1 College of Science, Faculty of Geology, Tehran University, Tehran, Iran
2 N.I.O.C Exploration Directorate, Tehran, Iran
چکیده [English]

To recognize different species of the genus Orbitolina and determine the age of the Dariyan Formation, the upper limy part of the Dariyan Formation in Dashtak section was sampled and studied. Based on the size, shape and complexity of embryonic apparatus, five species belonging to subgenus Mesorbitolina were recognized as below: Orbitolina (Mesorbitolina) lotzei, Orbitolina (M.) parva, Orbitolina (M.) texana, Orbitolina (M.) subconcava, Orbitolina (M.)sp. cf .M. pervia According to stratigraphic distribution of the mesorbitolinids, the upper part of the Dariyan Formation can be ascribed to the late early Aptian-late Aptian. The early/late Aptian boundary coincides with first occurrence of O. (M.) parva

کلیدواژه‌ها [English]

  • Mesorbitolina
  • Aptian
  • Dariyan formation
  • Dashtak stratigraphic section
  • Northt of Shiraz
 
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