زیست چینه‌شناسی سازند گورپی در طاقدیس اناران (ناحیه لرستان) براساس نانوفسیل‌های آهکی

نوع مقاله : علمی -پژوهشی

نویسندگان

1 دانشجوی دکترا، دانشکده علوم زمین، دانشگاه شهید بهشتی

2 دانشیار، دانشکده علوم زمین، دانشگاه شهید بهشتی

3 دکترا، شرکت ملی نفت مناطق نفت‌خیز جنوب، اهواز

4 دکترا، مدیریت اکتشاف شرکت ملی نفت ایران، تهران

10.29252/esrj.9.3.139

چکیده

سازند گورپی در طاقدیس اناران در ناحیه جنوب شرقی لرستان حاوی 5/269 متر مارن با میان لایه‌های مارن آهکی است که دو عضو رسمی آهک سیمره و آهک رسی امام حسن را شامل می‌شود. براساس مطالعات انجام شده در این برش 70 گونه متعلق به 38 جنس از نانوفسیل‌های آهکی تشخیص داده شده که منجر به تفکیک 8 بیوزون نانوفسیلی شده است. با توجه به بیوزون‌های شناسایی شده، سازند گورپی در این برش در بازه‌ای از کامپانین میانی تا پالئوسن نهشته شده است. براساس شواهد فسیل‌شناسی گذر کرتاسه-پالئوژن ناپیوسته بوده و عدم ثبت بیوزون‌های NP1 تا NP4 موید نبود بخش اعظم بازه دانین در برش مورد مطالعه است. به نظر می‌رسد فعالیت مجدد ساختار خطی اناران به شکل یک بلندی دیرینه مسبب تفاوت رخساره و ناپیوستگی در رأس سازند گورپی در جنوب شرق ناحیه لرستان باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Biostratigraphy of Gurpi Formation in Anaran anticline (Lurestan Province) based on calcareous nannofossils

نویسندگان [English]

  • samira shahriyary 1
  • Anoshiravan Kani 2
  • Hasan Amiri Bakhtiar 3
  • Amir Mohammad Jamali 4
1 Ph.D Student, Faculty of Earth Sciences, Shahid Beheshti University
2 Associate Professor, Faculty of Earth Sciences, Shahid Beheshti University
3 Ph.D, National Iranian Southern Oil-Field Company (NISOC), Ahwaz
4 Ph.D, National Iranian Oil Company, Exploration Directorate, Tehran
چکیده [English]

Abstract
The Gurpi Formation at Anaran Anticline in SE of Lurestan province.consists of 269.5 meters of marl with intercalation of limy marl; two formal members of Seymareh limestone and Emam-Hasan argillaceous limestone are also exposed. Studies reveal presence of 70 species belonging to 38 genera of calcareous nannofossils based on which 8 global biozones were differentiated. Consequently, the Gurpi Formation was attributed to middle Campanian through Paleocene. There is a distinct hiatus in Cretaceous-Paleogene boundary based on paleontological evidence, as deduced from the absence of nannofossil biozones NP1-NP4. It seems that the reactivation of Anaran linement as paleohigh caused facies changes and hiatus in Gurpi Formation in SE of Lurestan province.

کلیدواژه‌ها [English]

  • Key words: Anaran Anticline – Biostratigraphy
  • Calcareous nannofossil
  • Gurpi Formation
  • K/Pg boundary

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پژوهشهای دانش زمین
دوره 9، شماره 3 - شماره پیاپی 35
پژوهشی
آذر 1397
صفحه 139-161

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