Researches in Earth Sciences

Researches in Earth Sciences

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

Document Type : علمی -پژوهشی

Authors
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
10.29252/esrj.9.3.139
Abstract
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.
Keywords
Key words: Anaran Anticline – Biostratigraphy
Calcareous nannofossil
Gurpi Formation
K/Pg boundary
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