The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications
<p>The Eocene–Oligocene Transition (EOT) represents a pivotal period in Earth's climatic history, marked by the onset of Antarctic glaciation and global cooling. While deep-sea records have extensively documented this transition, its impacts on marginal and epicontinental seas remain less...
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Copernicus Publications
2025-08-01
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| Series: | Climate of the Past |
| Online Access: | https://cp.copernicus.org/articles/21/1405/2025/cp-21-1405-2025.pdf |
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| author | M. Y. Kaya M. Y. Kaya H. Brinkhuis H. Brinkhuis C. Fioroni S. G. Atasoy A. Licht D. Nürnberg T. Vural |
| author_facet | M. Y. Kaya M. Y. Kaya H. Brinkhuis H. Brinkhuis C. Fioroni S. G. Atasoy A. Licht D. Nürnberg T. Vural |
| author_sort | M. Y. Kaya |
| collection | DOAJ |
| description | <p>The Eocene–Oligocene Transition (EOT) represents a pivotal period in Earth's climatic history, marked by the onset of Antarctic glaciation and global cooling. While deep-sea records have extensively documented this transition, its impacts on marginal and epicontinental seas remain less understood. This study investigates the impacts of the EOT in the Karaburun composite section, located in the Eastern Paratethys. Using a multidisciplinary approach that integrates biostratigraphy, geochemistry, geochronology, and sequence stratigraphy, a robust chronostratigraphic framework for the latest Eocene to early Oligocene was established. The stable isotopic shifts observed in benthic and planktic foraminifera <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C records at Karaburun align with global patterns but also reveal regional effects, such as freshwater influx and basin restriction, specific to the semi-restricted Paratethys. The abrupt negative <span class="inline-formula"><i>δ</i><sup>18</sup></span>O shift across the Eocene–Oligocene Boundary (EOB) in the Paratethys reflects boreal water ingressions driven by the onset of anti-estuarine circulation between the Nordic Seas and the Atlantic and the closure of the Arctic–Atlantic gateway, which redirected cold, low-salinity boreal waters through interconnected basins towards the Paratethys. These findings highlight the interplay between global climate drivers and regional hydrological dynamics, providing critical insights into the evolution of marginal marine environments during the EOT. Our results underscore the significance of the Paratethys as a unique archive for studying the onset of global icehouse climate conditions and regional responses.</p> |
| format | Article |
| id | doaj-art-8777def7e12d4a5dac950a982c69ecac |
| institution | DOAJ |
| issn | 1814-9324 1814-9332 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Copernicus Publications |
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| series | Climate of the Past |
| spelling | doaj-art-8777def7e12d4a5dac950a982c69ecac2025-08-20T03:16:19ZengCopernicus PublicationsClimate of the Past1814-93241814-93322025-08-01211405142910.5194/cp-21-1405-2025The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implicationsM. Y. Kaya0M. Y. Kaya1H. Brinkhuis2H. Brinkhuis3C. Fioroni4S. G. Atasoy5A. Licht6D. Nürnberg7T. Vural8Department of Geological Engineering, Middle East Technical University, Ankara, 06800, Türkiyepresent address: Geological Institute, RWTH Aachen University, Aachen, GermanyOceans Systems Research (OCS), NIOZ Royal Netherlands Institute of Sea Research, Texel, 1790 AB, the NetherlandsDepartment of Earth Sciences, Laboratory of Palaeobotany and Palynology, Faculty of Geosciences, Utrecht University, 3584 CB Utrecht, the NetherlandsDipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Modena, 41121, ItalyDepartment of Geological Engineering, Middle East Technical University, Ankara, 06800, TürkiyeAix-Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, Technopôle de l'Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, FranceGEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, GermanyDepartment of Geological Engineering, Middle East Technical University, Ankara, 06800, Türkiye<p>The Eocene–Oligocene Transition (EOT) represents a pivotal period in Earth's climatic history, marked by the onset of Antarctic glaciation and global cooling. While deep-sea records have extensively documented this transition, its impacts on marginal and epicontinental seas remain less understood. This study investigates the impacts of the EOT in the Karaburun composite section, located in the Eastern Paratethys. Using a multidisciplinary approach that integrates biostratigraphy, geochemistry, geochronology, and sequence stratigraphy, a robust chronostratigraphic framework for the latest Eocene to early Oligocene was established. The stable isotopic shifts observed in benthic and planktic foraminifera <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and <span class="inline-formula"><i>δ</i><sup>13</sup></span>C records at Karaburun align with global patterns but also reveal regional effects, such as freshwater influx and basin restriction, specific to the semi-restricted Paratethys. The abrupt negative <span class="inline-formula"><i>δ</i><sup>18</sup></span>O shift across the Eocene–Oligocene Boundary (EOB) in the Paratethys reflects boreal water ingressions driven by the onset of anti-estuarine circulation between the Nordic Seas and the Atlantic and the closure of the Arctic–Atlantic gateway, which redirected cold, low-salinity boreal waters through interconnected basins towards the Paratethys. These findings highlight the interplay between global climate drivers and regional hydrological dynamics, providing critical insights into the evolution of marginal marine environments during the EOT. Our results underscore the significance of the Paratethys as a unique archive for studying the onset of global icehouse climate conditions and regional responses.</p>https://cp.copernicus.org/articles/21/1405/2025/cp-21-1405-2025.pdf |
| spellingShingle | M. Y. Kaya M. Y. Kaya H. Brinkhuis H. Brinkhuis C. Fioroni S. G. Atasoy A. Licht D. Nürnberg T. Vural The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications Climate of the Past |
| title | The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications |
| title_full | The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications |
| title_fullStr | The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications |
| title_full_unstemmed | The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications |
| title_short | The Eocene–Oligocene Transition in the Paratethys: boreal water ingression and its paleoceanographic implications |
| title_sort | eocene oligocene transition in the paratethys boreal water ingression and its paleoceanographic implications |
| url | https://cp.copernicus.org/articles/21/1405/2025/cp-21-1405-2025.pdf |
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