Calcareous nannofossils of the late Eocene to early Oligocene from the Pabdeh and Asmari transition in Dezful Embayment (southwestern Iran): Evidence of a climate cooling event,Geological Journal

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Calcareous nannofossils of the late Eocene to early Oligocene from the Pabdeh and Asmari transition in Dezful Embayment (southwestern Iran): Evidence of a climate cooling event
Geological Journal ( IF 1.4 ) Pub Date : 2022-09-22 , DOI: 10.1002/gj.4597
Saeedeh Senemari ₁ , Azam Mahanipour ₂

Affiliation

Calcareous nannofossil assemblages have been investigated in the uppermost Eocene to the lowest Oligocene in the Marun oil field in the Dezful Embayment (south-west Iran). The studied interval includes shales, marlstones and limestones. Seventeen genera and 35 species of calcareous nannofossils have been determined. Regarding the succession of nannofossil bioevents, the studied interval ranges from the late Eocene (Priabonian, CNE18 Zone or NP18 Zone) to the early Oligocene (Rupelian, CNO2 Zone, or NP22 Zone). A high relative abundance of warm water taxa (such as Sphenolithus spp., Discoaster spp. and Helicosphaera spp.) is recorded in 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 the abundance of warm water taxa along with a decrease in species diversity indicates that the cooling event at the EOB in the Marun oil field in Iran is similar to other parts of the world (Tethys realm).

中文翻译：

Dezful Embayment（伊朗西南部）Pabdeh 和 Asmari 转变的始新世晚期至渐新世早期的钙质超微化石：气候降温事件的证据

在 Dezful Embayment（伊朗西南部）的 Marun 油田的始新世最高层到渐新世最低层的钙质超微化石组合已被研究。研究层段包括页岩、泥灰岩和石灰岩。已确定了 17 属和 35 种钙质超微化石。关于超微化石生物事件的演替，研究区间从始新世晚期（Priabonian，CNE18 Zone 或 NP18 Zone）到渐新世早期（Rupelian，CNO2 Zone，或 NP22 Zone）。相对丰富的温水类群（例如Sphenolithus spp .、Discoaster spp. 和Helicosphaeraspp.) 记录在始新世晚期，而在接近始新世-渐新世边界 (EOB) 时，凉爽和温带类群（如Reticulofenestra spp.、Cyclicargolithus floridanus、Dictyococcites bisecta和Markalius inversus）的相对丰度有所增加. 温水类群的丰度显着下降以及物种多样性的下降表明伊朗马伦油田 EOB 的冷却事件与世界其他地区（特提斯领域）相似。

更新日期：2022-09-22

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