Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau)
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 ear...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-11-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.998237/full |
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| author | F. Hodel F. Hodel C. Fériot G. Dera M. De Rafélis C. Lezin E. Nardin D. Rouby M. Aretz P. Antonio M. Buatier M. Steinmann F. Lacan C. Jeandel V. Chavagnac |
| author_facet | F. Hodel F. Hodel C. Fériot G. Dera M. De Rafélis C. Lezin E. Nardin D. Rouby M. Aretz P. Antonio M. Buatier M. Steinmann F. Lacan C. Jeandel V. Chavagnac |
| author_sort | F. Hodel |
| collection | DOAJ |
| description | 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 δ18O-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. δ13C 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 δ18O during the EOT (Eocene-Oligocene Transition) while Mg/Ca-temperatures remain rather constant. This indicates a significant ice control on the δ18O record. |
| first_indexed | 2024-04-12T08:52:59Z |
| format | Article |
| id | doaj.art-968317c742164be582481067d118b57c |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-12T08:52:59Z |
| publishDate | 2022-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-968317c742164be582481067d118b57c2022-12-22T03:39:31ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-11-011010.3389/feart.2022.998237998237Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau)F. Hodel0F. Hodel1C. Fériot2G. Dera3M. De Rafélis4C. Lezin5E. Nardin6D. Rouby7M. Aretz8P. Antonio9M. Buatier10M. Steinmann11F. Lacan12C. Jeandel13V. Chavagnac14Laboratoire Chrono-Environnement, UMR6249 CNRS-UFC, Besançon, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Montpellier, Université de Montpellier, CNRS, Montpellier, FranceLaboratoire Chrono-Environnement, UMR6249 CNRS-UFC, Besançon, FranceLaboratoire Chrono-Environnement, UMR6249 CNRS-UFC, Besançon, FranceLaboratoire d'Etudes en Géophysique et Océanographie Spatiale (LEGOS), Université de Toulouse/CNRS/CNES/IRD/Université Paul Sabatier), Observatoire Midi-Pyrénées, Toulouse, FranceLaboratoire d'Etudes en Géophysique et Océanographie Spatiale (LEGOS), Université de Toulouse/CNRS/CNES/IRD/Université Paul Sabatier), Observatoire Midi-Pyrénées, Toulouse, FranceGéosciences Environnement Toulouse (GET), UMR5563 Université de Toulouse/CNRS/IRD/Université Paul Sabatier, Observatoire Midi-Pyrénées, Toulouse, FranceDespite 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 δ18O-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. δ13C 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 δ18O during the EOT (Eocene-Oligocene Transition) while Mg/Ca-temperatures remain rather constant. This indicates a significant ice control on the δ18O record.https://www.frontiersin.org/articles/10.3389/feart.2022.998237/fullpaleoceanographyclimateforaminiferaEoceneOligocenesouthwest Pacific Ocean |
| spellingShingle | F. Hodel F. Hodel C. Fériot G. Dera M. De Rafélis C. Lezin E. Nardin D. Rouby M. Aretz P. Antonio M. Buatier M. Steinmann F. Lacan C. Jeandel V. Chavagnac Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau) Frontiers in Earth Science paleoceanography climate foraminifera Eocene Oligocene southwest Pacific Ocean |
| title | 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_short | 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 |
| topic | paleoceanography climate foraminifera Eocene Oligocene southwest Pacific Ocean |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.998237/full |
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