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  3. 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
 

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

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BORIS DOI
10.48350/162242
Date of Publication
November 30, 2021
Publication Type
Article
Division/Institute

Institut für Geologie...

Author
D’Onofrio, Roberta
Afify, Amr Said Zakyorcid-logo
Institut für Geologie
Frontalini, Fabrizio
Luciani, Valeria
Catanzariti, Rita
Francescangeli, Fabio
Giorgioni, Martino
Coccioni, Rodolfo
Özcan, Ercan
Jovane, Luigi
Subject(s)

500 - Science::550 - ...

Series
Applied Sciences
ISSN or ISBN (if monograph)
2076-3417
Publisher
MDPI
Language
English
Publisher DOI
10.3390/app112311339
Uncontrolled Keywords

planktic foraminifera...

benthic foraminifera

calcareous nannofossi...

middle eocene climati...

Neo-Tethys

biota resilience

warming event analogu...

Description
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.
Handle
https://boris-portal.unibe.ch/handle/20.500.12422/58287
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