Impact of the Middle Eocene Climatic Optimum (MECO) on Foraminiferal and Calcareous Nannofossil Assemblages in the Neo-Tethyan Baskil Section (Eastern Turkey): Paleoenvironmental and Paleoclimatic Reconstructions

D’Onofrio, Roberta; Zaky, Amr S.; Frontalini, Fabrizio; Luciani, Valeria; Catanzariti, Rita; Francescangeli, Fabio; Giorgioni, Martino; Coccioni, Rodolfo; Özcan, Ercan; Jovane, Luigi (2021). Impact of the Middle Eocene Climatic Optimum (MECO) on Foraminiferal and Calcareous Nannofossil Assemblages in the Neo-Tethyan Baskil Section (Eastern Turkey): Paleoenvironmental and Paleoclimatic Reconstructions. Applied Sciences, 11(23), p. 11339. MDPI 10.3390/app112311339

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The Middle Eocene Climatic Optimum (MECO; ~40 Ma), which interrupted for ~500–600 kyr the long-term cooling trend culminating at the Eocene/Oligocene boundary, still requires a comprehensive understanding of the biotic resilience. Here we present a high-resolution integrated foraminiferal and calcareous nannofossil study across the MECO from the expanded and continuous Tethyan Baskil section (eastern Turkey) that offers a complete magneto-biostratigraphic and geochemical framework. The five MECO phases identified reveal a transition from oligotrophic (pre-MECO) to eu-mesotrophic conditions, possibly related to accelerated hydrological cycle, during the initial MECO and MECO δ13C negative excursion phases. The MECO WARMING PEAK phase, marking the highest carbonate dissolution interval, records the most striking biotic changes, such as peak in warm and eutrophic nannofossils, virtual disappearance of the oligotrophic planktic foraminiferal large Acarinina and Morozovelloides, and peak in eutrophic deep dwellers Subbotina. Benthic foraminifera suggest in this phase an improvement in the quality of organic matter to the seafloor. The post-MECO phase shows only a partial recovery of the pre-event conditions. Large Acarinina and Morozovelloides did not recover their abundance, possibly due to cooler conditions in this phase. Our reconstruction reveals how paleoenvironment and marine biota from the studied Neo-Tethyan setting reacted to the MECO perturbations.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Zaky Afify, Amr Said

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2076-3417

Publisher:

MDPI

Language:

English

Submitter:

Amr Said Zaky Afify

Date Deposited:

13 Jan 2022 07:48

Last Modified:

13 Jan 2022 07:48

Publisher DOI:

10.3390/app112311339

Uncontrolled Keywords:

planktic foraminifera; benthic foraminifera; calcareous nannofossils; middle eocene climatic optimum; Neo-Tethys; biota resilience; warming event analogues

BORIS DOI:

10.48350/162242

URI:

https://boris.unibe.ch/id/eprint/162242

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