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Calcareous nannofossils of the late Eocene- early Oligocene from the Pabdeh ‒ Asmari transition in Dezful embayment (SW Iran): Evidence of a climate cooling event
  • saeedeh senemari,
  • Azam Mahanipour
saeedeh senemari
1Department of Mining, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran

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Azam Mahanipour
Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran
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1 2-3 4 5 6 7 8 9 key points: paleoclimatology, biostratigraphy, paleoceanography The Calcareous nannofossil assemblages have been investigated at the uppermost Eocene ‒ lowermost Oligocene at Marun Oil Field in Dezful embayment (SW Iran). The studied interval mainly consists of marly shales, marlstones, and limestones. Seventeen genera and 36 species of calcareous nannofossil have been determined. Regarding the succession of nannofossil bioevents, the studied interval is ranging from late Eocene (Priabonian, CNE18/NP18) to early Oligocene (Rupelian, CNO2/NP22). High relative abundance of warm water taxa (such as Sphenolithus spp., Discoaster spp. and Helicosphaera spp.) is recorded at the late Eocene, while towards the Eocene ‒ Oligocene boundary (EOB), an increase in the relative abundance of cool and temperate taxa (such as Reticulofenestra spp., Cyclicargolithus floridanus, Dictyococcites bisecta and Markalius inversus) is identified. A marked decrease in abundance of warm water taxa along with a decrease in species diversity indicate the cooling event at the EOB at Marun Oil Field in Iran similar to other parts of the world.