Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau)
International audience Despite its major role in the Earth’s climate regulation, the evolution of high-latitude ocean dynamics through geological time remains unclear. Around Antarctica, changes in the Southern Ocean (SO) circulation are inferred to be responsible for cooling from the late Eocene an...
Published in: | Frontiers in Earth Science |
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Main Authors: | , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Subjects: | |
Online Access: | https://hal.science/hal-03906973 https://hal.science/hal-03906973/document https://hal.science/hal-03906973/file/Hodel-Frontiers-2022.pdf https://doi.org/10.3389/feart.2022.998237 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Hodel, F. Fériot, C. Dera, G. de Rafélis, M. Lezin, C. Nardin, E. Rouby, D. Aretz, M. Antonio, P. Buatier, M. Steinmann, M. Lacan, F. Jeandel, C. Chavagnac, V. Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Despite its major role in the Earth’s climate regulation, the evolution of high-latitude ocean dynamics through geological time remains unclear. Around Antarctica, changes in the Southern Ocean (SO) circulation are inferred to be responsible for cooling from the late Eocene and glaciation in the early Oligocene. Here, we present a geochemical study of foraminifera from DSDP Site 277 (Campbell Plateau), to better constrain thermal and redox evolution of the high latitude southwest Pacific Ocean during this time interval. From 56 to 48 Ma, Mg/Ca- and δ 18 O-paleothermometers indicate high surface and bottom water temperatures (24–26°C and 12–14°C, respectively), while weak negative Ce anomalies indicate poorly oxygenated bottom waters. This is followed by a cooling of ∼4° between 48 and 42 Ma, possibly resulting from a weakening of a proto-EAC (East Australian Current) and concomitant strengthening of a proto-Ross gyre. This paleoceanographic change is associated with better ventilation at Site 277, recorded by an increasing negative Ce anomaly. Once this proto-Ross gyre was fully active, increasing biogenic sedimentation rates and decreasing Subbotina sp. δ 13 C values indicate enhanced productivity. This resulted in a shoaling of the oxygen penetration in the sediment pile recorded by increasing the foraminiferal U/Ca ratio. The negative Ce anomaly sharply increased two times at ∼35 and ∼31 Ma, indicating enhanced seawater ventilation synchronously with the opening of the Tasmanian and Drake Passage gateways, respectively. The Oligocene glaciation is recorded by a major increase of bottom seawater δ 18 O during the EOT (Eocene-Oligocene Transition) while Mg/Ca-temperatures remain rather constant. This indicates a significant ice control on the δ 18 O record. |
author2 |
Laboratoire Chrono-environnement (UMR 6249) (LCE) Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Université de Montpellier (UM) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) |
format |
Article in Journal/Newspaper |
author |
Hodel, F. Fériot, C. Dera, G. de Rafélis, M. Lezin, C. Nardin, E. Rouby, D. Aretz, M. Antonio, P. Buatier, M. Steinmann, M. Lacan, F. Jeandel, C. Chavagnac, V. |
author_facet |
Hodel, F. Fériot, C. Dera, G. de Rafélis, M. Lezin, C. Nardin, E. Rouby, D. Aretz, M. Antonio, P. Buatier, M. Steinmann, M. Lacan, F. Jeandel, C. Chavagnac, V. |
author_sort |
Hodel, F. |
title |
Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) |
title_short |
Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) |
title_full |
Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) |
title_fullStr |
Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) |
title_full_unstemmed |
Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) |
title_sort |
eocene-oligocene southwest pacific ocean paleoceanography new insights from foraminifera chemistry (dsdp site 277, campbell plateau) |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03906973 https://hal.science/hal-03906973/document https://hal.science/hal-03906973/file/Hodel-Frontiers-2022.pdf https://doi.org/10.3389/feart.2022.998237 |
long_lat |
ENVELOPE(171.000,171.000,-50.667,-50.667) |
geographic |
Campbell Plateau Drake Passage Pacific Southern Ocean |
geographic_facet |
Campbell Plateau Drake Passage Pacific Southern Ocean |
genre |
Antarc* Antarctica Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctica Drake Passage Southern Ocean |
op_source |
ISSN: 2296-6463 Frontiers in Earth Science https://hal.science/hal-03906973 Frontiers in Earth Science, 2022, 10, pp.:998237. ⟨10.3389/feart.2022.998237⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/feart.2022.998237 hal-03906973 https://hal.science/hal-03906973 https://hal.science/hal-03906973/document https://hal.science/hal-03906973/file/Hodel-Frontiers-2022.pdf doi:10.3389/feart.2022.998237 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3389/feart.2022.998237 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1792041587536035840 |
spelling |
ftccsdartic:oai:HAL:hal-03906973v1 2024-02-27T08:35:08+00:00 Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) Hodel, F. Fériot, C. Dera, G. de Rafélis, M. Lezin, C. Nardin, E. Rouby, D. Aretz, M. Antonio, P. Buatier, M. Steinmann, M. Lacan, F. Jeandel, C. Chavagnac, V. Laboratoire Chrono-environnement (UMR 6249) (LCE) Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Université de Montpellier (UM) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 2022 https://hal.science/hal-03906973 https://hal.science/hal-03906973/document https://hal.science/hal-03906973/file/Hodel-Frontiers-2022.pdf https://doi.org/10.3389/feart.2022.998237 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/feart.2022.998237 hal-03906973 https://hal.science/hal-03906973 https://hal.science/hal-03906973/document https://hal.science/hal-03906973/file/Hodel-Frontiers-2022.pdf doi:10.3389/feart.2022.998237 info:eu-repo/semantics/OpenAccess ISSN: 2296-6463 Frontiers in Earth Science https://hal.science/hal-03906973 Frontiers in Earth Science, 2022, 10, pp.:998237. ⟨10.3389/feart.2022.998237⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2022 ftccsdartic https://doi.org/10.3389/feart.2022.998237 2024-01-28T01:01:41Z International audience Despite its major role in the Earth’s climate regulation, the evolution of high-latitude ocean dynamics through geological time remains unclear. Around Antarctica, changes in the Southern Ocean (SO) circulation are inferred to be responsible for cooling from the late Eocene and glaciation in the early Oligocene. Here, we present a geochemical study of foraminifera from DSDP Site 277 (Campbell Plateau), to better constrain thermal and redox evolution of the high latitude southwest Pacific Ocean during this time interval. From 56 to 48 Ma, Mg/Ca- and δ 18 O-paleothermometers indicate high surface and bottom water temperatures (24–26°C and 12–14°C, respectively), while weak negative Ce anomalies indicate poorly oxygenated bottom waters. This is followed by a cooling of ∼4° between 48 and 42 Ma, possibly resulting from a weakening of a proto-EAC (East Australian Current) and concomitant strengthening of a proto-Ross gyre. This paleoceanographic change is associated with better ventilation at Site 277, recorded by an increasing negative Ce anomaly. Once this proto-Ross gyre was fully active, increasing biogenic sedimentation rates and decreasing Subbotina sp. δ 13 C values indicate enhanced productivity. This resulted in a shoaling of the oxygen penetration in the sediment pile recorded by increasing the foraminiferal U/Ca ratio. The negative Ce anomaly sharply increased two times at ∼35 and ∼31 Ma, indicating enhanced seawater ventilation synchronously with the opening of the Tasmanian and Drake Passage gateways, respectively. The Oligocene glaciation is recorded by a major increase of bottom seawater δ 18 O during the EOT (Eocene-Oligocene Transition) while Mg/Ca-temperatures remain rather constant. This indicates a significant ice control on the δ 18 O record. Article in Journal/Newspaper Antarc* Antarctica Drake Passage Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) Drake Passage Pacific Southern Ocean Frontiers in Earth Science 10 |