Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B
Ephemeral polar glaciations during the middle-to-late Eocene (48-34 Ma) have been proposed based on far-field ice volume proxy records and near-field glacigenic sediments, although the scale, timing, and duration of these events are poorly constrained. Here we confirm the existence of a transient co...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.858177 2023-05-15T13:44:47+02:00 Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B Scher, Howie D Bohaty, Steven M Smith, Brian W Munn, Colin B LATITUDE: -62.709000 * LONGITUDE: 82.787800 * DATE/TIME START: 1988-01-10T16:30:00 * DATE/TIME END: 1988-01-11T18:45:00 2014-02-17 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.858177 https://doi.org/10.1594/PANGAEA.858177 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.858177 https://doi.org/10.1594/PANGAEA.858177 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Scher, Howie D; Bohaty, Steven M; Smith, Brian W; Munn, Colin B (2014): Isotopic interrogation of a suspected late Eocene glaciation. Paleoceanography, 29(6), 628-644, https://doi.org/10.1002/2014PA002648 119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP Dataset 2014 ftpangaea https://doi.org/10.1594/PANGAEA.858177 https://doi.org/10.1002/2014PA002648 2023-01-20T07:33:41Z Ephemeral polar glaciations during the middle-to-late Eocene (48-34 Ma) have been proposed based on far-field ice volume proxy records and near-field glacigenic sediments, although the scale, timing, and duration of these events are poorly constrained. Here we confirm the existence of a transient cool event within a new high-resolution benthic foraminiferal d18O record at Ocean Drilling Program (ODP) Site 738 (Kerguelen Plateau; Southern Ocean). This event, named the Priabonian oxygen isotope maximum (PrOM) Event, lasted ~140 kyr and is tentatively placed within magnetochron C17n.1n (~37.3 Ma) based on the correlation to ODP Site 689 (Maud Rise, Southern Ocean). A contemporaneous change in the provenance of sediments delivered to the Kerguelen Plateau occurs at the study site, determined from the <63 µm fraction of decarbonated and reductively leached sediment samples. Changes in the mixture of bottom waters, based on fossil fish tooth epsilon-Nd, were less pronounced and slower relative to the benthic d18O and terrigenous epsilon-Nd changes. Terrigenous sediment epsilon-Nd values rapidly shifted to less radiogenic signatures at the onset of the PrOM Event, indicating an abrupt change in provenance favoring ancient sources such as the Paleoproterozoic East Antarctic craton. Bottom water epsilon-Nd reached a minimum value during the PrOM Event, although the shift begins much earlier than the terrigenous epsilon-Nd excursion. The origin of the abrupt change in terrigenous sediment provenance is compatible with a change in Antarctic terrigenous sediment flux and/or source as opposed to a reorganization of ocean currents. A change in terrigenous flux and/or source of Antarctic sediments during the oxygen isotope maximum suggests a combination of cooling and ice growth in East Antarctica during the early late Eocene. Dataset Antarc* Antarctic Antarctica East Antarctica Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean East Antarctica Kerguelen Indian Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(82.787800,82.787800,-62.709000,-62.709000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP |
spellingShingle |
119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP Scher, Howie D Bohaty, Steven M Smith, Brian W Munn, Colin B Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B |
topic_facet |
119-738B DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg119 Ocean Drilling Program ODP |
description |
Ephemeral polar glaciations during the middle-to-late Eocene (48-34 Ma) have been proposed based on far-field ice volume proxy records and near-field glacigenic sediments, although the scale, timing, and duration of these events are poorly constrained. Here we confirm the existence of a transient cool event within a new high-resolution benthic foraminiferal d18O record at Ocean Drilling Program (ODP) Site 738 (Kerguelen Plateau; Southern Ocean). This event, named the Priabonian oxygen isotope maximum (PrOM) Event, lasted ~140 kyr and is tentatively placed within magnetochron C17n.1n (~37.3 Ma) based on the correlation to ODP Site 689 (Maud Rise, Southern Ocean). A contemporaneous change in the provenance of sediments delivered to the Kerguelen Plateau occurs at the study site, determined from the <63 µm fraction of decarbonated and reductively leached sediment samples. Changes in the mixture of bottom waters, based on fossil fish tooth epsilon-Nd, were less pronounced and slower relative to the benthic d18O and terrigenous epsilon-Nd changes. Terrigenous sediment epsilon-Nd values rapidly shifted to less radiogenic signatures at the onset of the PrOM Event, indicating an abrupt change in provenance favoring ancient sources such as the Paleoproterozoic East Antarctic craton. Bottom water epsilon-Nd reached a minimum value during the PrOM Event, although the shift begins much earlier than the terrigenous epsilon-Nd excursion. The origin of the abrupt change in terrigenous sediment provenance is compatible with a change in Antarctic terrigenous sediment flux and/or source as opposed to a reorganization of ocean currents. A change in terrigenous flux and/or source of Antarctic sediments during the oxygen isotope maximum suggests a combination of cooling and ice growth in East Antarctica during the early late Eocene. |
format |
Dataset |
author |
Scher, Howie D Bohaty, Steven M Smith, Brian W Munn, Colin B |
author_facet |
Scher, Howie D Bohaty, Steven M Smith, Brian W Munn, Colin B |
author_sort |
Scher, Howie D |
title |
Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B |
title_short |
Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B |
title_full |
Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B |
title_fullStr |
Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B |
title_full_unstemmed |
Neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from ODP Hole 119-738 B |
title_sort |
neodymium isotopes from fossil fish teeth and detrital sediment, and oxygen isotopes from benthic forams from odp hole 119-738 b |
publisher |
PANGAEA |
publishDate |
2014 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.858177 https://doi.org/10.1594/PANGAEA.858177 |
op_coverage |
LATITUDE: -62.709000 * LONGITUDE: 82.787800 * DATE/TIME START: 1988-01-10T16:30:00 * DATE/TIME END: 1988-01-11T18:45:00 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(82.787800,82.787800,-62.709000,-62.709000) |
geographic |
Antarctic Southern Ocean East Antarctica Kerguelen Indian Maud Rise |
geographic_facet |
Antarctic Southern Ocean East Antarctica Kerguelen Indian Maud Rise |
genre |
Antarc* Antarctic Antarctica East Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Southern Ocean |
op_source |
Supplement to: Scher, Howie D; Bohaty, Steven M; Smith, Brian W; Munn, Colin B (2014): Isotopic interrogation of a suspected late Eocene glaciation. Paleoceanography, 29(6), 628-644, https://doi.org/10.1002/2014PA002648 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.858177 https://doi.org/10.1594/PANGAEA.858177 |
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.858177 https://doi.org/10.1002/2014PA002648 |
_version_ |
1766206402355789824 |