Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites
We assess early-to-middle Eocene seawater neodymium (Nd) isotope records from seven Southern Ocean deep-sea drill sites to evaluate the role of Southern Ocean circulation in long-term Cenozoic climate change. Our study sites are strategically located on either side of the Tasman Gateway and are posi...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.875929 2023-05-15T13:44:47+02:00 Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites Huck, Claire E van de Flierdt, Tina Bohaty, Steven M Hammond, Samantha J MEDIAN LATITUDE: -48.480885 * MEDIAN LONGITUDE: 119.351913 * SOUTH-BOUND LATITUDE: -63.310230 * WEST-BOUND LONGITUDE: 82.787800 * NORTH-BOUND LATITUDE: -17.024000 * EAST-BOUND LONGITUDE: 166.191300 * DATE/TIME START: 1972-12-22T00:00:00 * DATE/TIME END: 2000-05-03T21:00:00 2017-06-06 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.875929 https://doi.org/10.1594/PANGAEA.875929 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.875929 https://doi.org/10.1594/PANGAEA.875929 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Huck, Claire E; van de Flierdt, Tina; Bohaty, Steven M; Hammond, Samantha J (2017): Antarctic climate, Southern Ocean circulation patterns, and deep water formation during the Eocene. Paleoceanography, https://doi.org/10.1002/2017PA003135 Deep Sea Drilling Project DSDP Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Ocean Drilling Program ODP Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.875929 https://doi.org/10.1002/2017PA003135 2023-01-20T07:33:57Z We assess early-to-middle Eocene seawater neodymium (Nd) isotope records from seven Southern Ocean deep-sea drill sites to evaluate the role of Southern Ocean circulation in long-term Cenozoic climate change. Our study sites are strategically located on either side of the Tasman Gateway and are positioned at a range of shallow (<500 m) to intermediate/deep (~1000-2500 m) paleowater depths. Unradiogenic seawater Nd isotopic compositions, reconstructed from fish teeth at intermediate/deep Indian Ocean pelagic sites (Ocean Drilling Program (ODP) Sites 738 and 757 and Deep Sea Drilling Project (DSDP) Site 264), indicate a dominant Southern Ocean-sourced contribution to regional deep waters (epsilon-Nd(t) = -9.3 ± 1.5). IODP Site U1356 off the coast of Adélie Land, a locus of modern-day Antarctic Bottom Water production, is identified as a site of persistent deep water formation from the early Eocene to the Oligocene. East of the Tasman Gateway an additional local source of intermediate/deep water formation is inferred at ODP Site 277 in the SW Pacific Ocean (epsilon-Nd(t) = -8.7 ± 1.5). Antarctic-proximal shelf sites (ODP Site 1171 and Site U1356) reveal a pronounced erosional event between 49 and 48 Ma, manifested by ~2 epsilon-Nd unit negative excursions in seawater chemistry toward the composition of bulk sediments at these sites. This erosional event coincides with the termination of peak global warmth following the Early Eocene Climatic Optimum and is associated with documented cooling across the study region and increased export of Antarctic deep waters, highlighting the complexity and importance of Southern Ocean circulation in the greenhouse climate of the Eocene. Dataset Antarc* Antarctic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean Pacific Indian ENVELOPE(82.787800,166.191300,-17.024000,-63.310230) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Deep Sea Drilling Project DSDP Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Ocean Drilling Program ODP |
spellingShingle |
Deep Sea Drilling Project DSDP Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Ocean Drilling Program ODP Huck, Claire E van de Flierdt, Tina Bohaty, Steven M Hammond, Samantha J Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites |
topic_facet |
Deep Sea Drilling Project DSDP Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Ocean Drilling Program ODP |
description |
We assess early-to-middle Eocene seawater neodymium (Nd) isotope records from seven Southern Ocean deep-sea drill sites to evaluate the role of Southern Ocean circulation in long-term Cenozoic climate change. Our study sites are strategically located on either side of the Tasman Gateway and are positioned at a range of shallow (<500 m) to intermediate/deep (~1000-2500 m) paleowater depths. Unradiogenic seawater Nd isotopic compositions, reconstructed from fish teeth at intermediate/deep Indian Ocean pelagic sites (Ocean Drilling Program (ODP) Sites 738 and 757 and Deep Sea Drilling Project (DSDP) Site 264), indicate a dominant Southern Ocean-sourced contribution to regional deep waters (epsilon-Nd(t) = -9.3 ± 1.5). IODP Site U1356 off the coast of Adélie Land, a locus of modern-day Antarctic Bottom Water production, is identified as a site of persistent deep water formation from the early Eocene to the Oligocene. East of the Tasman Gateway an additional local source of intermediate/deep water formation is inferred at ODP Site 277 in the SW Pacific Ocean (epsilon-Nd(t) = -8.7 ± 1.5). Antarctic-proximal shelf sites (ODP Site 1171 and Site U1356) reveal a pronounced erosional event between 49 and 48 Ma, manifested by ~2 epsilon-Nd unit negative excursions in seawater chemistry toward the composition of bulk sediments at these sites. This erosional event coincides with the termination of peak global warmth following the Early Eocene Climatic Optimum and is associated with documented cooling across the study region and increased export of Antarctic deep waters, highlighting the complexity and importance of Southern Ocean circulation in the greenhouse climate of the Eocene. |
format |
Dataset |
author |
Huck, Claire E van de Flierdt, Tina Bohaty, Steven M Hammond, Samantha J |
author_facet |
Huck, Claire E van de Flierdt, Tina Bohaty, Steven M Hammond, Samantha J |
author_sort |
Huck, Claire E |
title |
Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites |
title_short |
Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites |
title_full |
Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites |
title_fullStr |
Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites |
title_full_unstemmed |
Fish tooth and sediment-derived neodymium isotopes and rare earth element data from Eocene-aged Southern Ocean marine drill sites |
title_sort |
fish tooth and sediment-derived neodymium isotopes and rare earth element data from eocene-aged southern ocean marine drill sites |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.875929 https://doi.org/10.1594/PANGAEA.875929 |
op_coverage |
MEDIAN LATITUDE: -48.480885 * MEDIAN LONGITUDE: 119.351913 * SOUTH-BOUND LATITUDE: -63.310230 * WEST-BOUND LONGITUDE: 82.787800 * NORTH-BOUND LATITUDE: -17.024000 * EAST-BOUND LONGITUDE: 166.191300 * DATE/TIME START: 1972-12-22T00:00:00 * DATE/TIME END: 2000-05-03T21:00:00 |
long_lat |
ENVELOPE(82.787800,166.191300,-17.024000,-63.310230) |
geographic |
Antarctic Southern Ocean Pacific Indian |
geographic_facet |
Antarctic Southern Ocean Pacific Indian |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Supplement to: Huck, Claire E; van de Flierdt, Tina; Bohaty, Steven M; Hammond, Samantha J (2017): Antarctic climate, Southern Ocean circulation patterns, and deep water formation during the Eocene. Paleoceanography, https://doi.org/10.1002/2017PA003135 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.875929 https://doi.org/10.1594/PANGAEA.875929 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.875929 https://doi.org/10.1002/2017PA003135 |
_version_ |
1766206565371609088 |