DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX
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...
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ftfrontimediafig:oai:figshare.com:article/21569604 2024-09-15T17:47:08+00:00 DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX 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 2022-11-17T04:16:35Z https://doi.org/10.3389/feart.2022.998237.s002 https://figshare.com/articles/dataset/DataSheet2_Eocene-Oligocene_southwest_Pacific_Ocean_paleoceanography_new_insights_from_foraminifera_chemistry_DSDP_site_277_Campbell_Plateau_XLSX/21569604 unknown doi:10.3389/feart.2022.998237.s002 https://figshare.com/articles/dataset/DataSheet2_Eocene-Oligocene_southwest_Pacific_Ocean_paleoceanography_new_insights_from_foraminifera_chemistry_DSDP_site_277_Campbell_Plateau_XLSX/21569604 CC BY 4.0 Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change paleoceanography climate foraminifera Eocene Oligocene southwest Pacific Ocean Dataset 2022 ftfrontimediafig https://doi.org/10.3389/feart.2022.998237.s002 2024-08-19T06:19:51Z 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. Dataset Antarc* Antarctica Drake Passage Southern Ocean Frontiers: Figshare |
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Frontiers: Figshare |
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ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change paleoceanography climate foraminifera Eocene Oligocene southwest Pacific Ocean |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change paleoceanography climate foraminifera Eocene Oligocene southwest Pacific Ocean 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 DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change paleoceanography climate foraminifera Eocene Oligocene southwest Pacific Ocean |
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 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. |
format |
Dataset |
author |
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 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 |
title |
DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX |
title_short |
DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX |
title_full |
DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX |
title_fullStr |
DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX |
title_full_unstemmed |
DataSheet2_Eocene-Oligocene southwest Pacific Ocean paleoceanography new insights from foraminifera chemistry (DSDP site 277, Campbell Plateau).XLSX |
title_sort |
datasheet2_eocene-oligocene southwest pacific ocean paleoceanography new insights from foraminifera chemistry (dsdp site 277, campbell plateau).xlsx |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.998237.s002 https://figshare.com/articles/dataset/DataSheet2_Eocene-Oligocene_southwest_Pacific_Ocean_paleoceanography_new_insights_from_foraminifera_chemistry_DSDP_site_277_Campbell_Plateau_XLSX/21569604 |
genre |
Antarc* Antarctica Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctica Drake Passage Southern Ocean |
op_relation |
doi:10.3389/feart.2022.998237.s002 https://figshare.com/articles/dataset/DataSheet2_Eocene-Oligocene_southwest_Pacific_Ocean_paleoceanography_new_insights_from_foraminifera_chemistry_DSDP_site_277_Campbell_Plateau_XLSX/21569604 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.3389/feart.2022.998237.s002 |
_version_ |
1810495845095702528 |