Neodymium isotopes in benthic foraminifera from the South Atlantic
Records of the past neodymium (Nd) isotope composition of the deep ocean can resolve ambiguities in the interpretation of other tracers. We present the first Nd isotope data for sedimentary benthic foraminifera. Comparison of the epsilon-Nd of core-top foraminifera from a depth transect on the Cape...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.712898 2023-05-15T17:13:50+02:00 Neodymium isotopes in benthic foraminifera from the South Atlantic Klevenz, Verena Vance, Derek Schmidt, Daniela N Mezger, Klaus MEDIAN LATITUDE: -27.244217 * MEDIAN LONGITUDE: 4.201979 * SOUTH-BOUND LATITUDE: -28.532680 * WEST-BOUND LONGITUDE: 2.845510 * NORTH-BOUND LATITUDE: -24.331667 * EAST-BOUND LONGITUDE: 8.250000 * DATE/TIME START: 1990-03-18T00:00:00 * DATE/TIME END: 2003-04-06T21:55:00 2008-02-17 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.712898 https://doi.org/10.1594/PANGAEA.712898 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.712898 https://doi.org/10.1594/PANGAEA.712898 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Klevenz, Verena; Vance, Derek; Schmidt, Daniela N; Mezger, Klaus (2008): Neodymium isotopes in benthic foraminifera: Core-top systematics and a down-core record from the Neogene south Atlantic. Earth and Planetary Science Letters, 265(3-4), 571-587, https://doi.org/10.1016/j.epsl.2007.10.053 208-1264A Cape Basin DRILL Drilling/drill rig GeoB1204-3 GeoB1206-1 GeoB1207-2 GeoB1208-1 GeoB1209-1 GeoB1210-3 GeoB1212-2 GeoB1213-2 Giant box corer GKG Joides Resolution Leg208 M12/1 Meteor (1986) Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.712898 https://doi.org/10.1016/j.epsl.2007.10.053 2023-01-20T07:31:23Z Records of the past neodymium (Nd) isotope composition of the deep ocean can resolve ambiguities in the interpretation of other tracers. We present the first Nd isotope data for sedimentary benthic foraminifera. Comparison of the epsilon-Nd of core-top foraminifera from a depth transect on the Cape Basin side of the Walvis Ridge to published seawater data, and to the modern dissolved SiO2- epsilon-Nd trend of the deep Atlantic, suggests that benthic foraminifera represent a reliable archive of the deep water Nd isotope composition. Neodymium isotope values of benthic foraminifera from ODP Site 1264A (Angola Basin side of the Walvis Ridge) from the last 8 Ma agree with Fe-Mn oxide coatings from the same samples and are also broadly consistent with existing fish teeth data for the deep South Atlantic, yielding confidence in the preservation of the marine Nd isotope signal in all these archives. The marine origin of the Nd in the coatings is confirmed by their marine Sr isotope values. These important results allow application of the technique to down-core samples. The new epsilon-Nd datasets, along with ancillary Cd/Ca and Nd/Ca ratios from the same foraminiferal samples, are interpreted in the context of debates on the Neogene history of North Atlantic Deep Water (NADW) export to the South Atlantic. In general, the epsilon-Nd and delta13C records are closely correlated over the past 4.5 Ma. The Nd isotope data suggest strong NADW export from 8 to 5 Ma, consistent with one interpretation of published delta13C gradients. Where the epsilon-Nd record differs from the nutrient-based records, changes in the pre-formed delta13C or Cd/Ca of southern-derived deep water might account for the difference. Maximum NADW-export for the entire record is suggested by all proxies at 3.5-4 Ma. Chemical conditions from 3 to 1 Ma are totally different, showing, on average, the lowest NADW export of the record. Modern-day values again imply NADW export that is about as strong as at any stage over the past 8 Ma. Dataset NADW North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(2.845510,8.250000,-24.331667,-28.532680) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
208-1264A Cape Basin DRILL Drilling/drill rig GeoB1204-3 GeoB1206-1 GeoB1207-2 GeoB1208-1 GeoB1209-1 GeoB1210-3 GeoB1212-2 GeoB1213-2 Giant box corer GKG Joides Resolution Leg208 M12/1 Meteor (1986) Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean |
spellingShingle |
208-1264A Cape Basin DRILL Drilling/drill rig GeoB1204-3 GeoB1206-1 GeoB1207-2 GeoB1208-1 GeoB1209-1 GeoB1210-3 GeoB1212-2 GeoB1213-2 Giant box corer GKG Joides Resolution Leg208 M12/1 Meteor (1986) Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean Klevenz, Verena Vance, Derek Schmidt, Daniela N Mezger, Klaus Neodymium isotopes in benthic foraminifera from the South Atlantic |
topic_facet |
208-1264A Cape Basin DRILL Drilling/drill rig GeoB1204-3 GeoB1206-1 GeoB1207-2 GeoB1208-1 GeoB1209-1 GeoB1210-3 GeoB1212-2 GeoB1213-2 Giant box corer GKG Joides Resolution Leg208 M12/1 Meteor (1986) Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean |
description |
Records of the past neodymium (Nd) isotope composition of the deep ocean can resolve ambiguities in the interpretation of other tracers. We present the first Nd isotope data for sedimentary benthic foraminifera. Comparison of the epsilon-Nd of core-top foraminifera from a depth transect on the Cape Basin side of the Walvis Ridge to published seawater data, and to the modern dissolved SiO2- epsilon-Nd trend of the deep Atlantic, suggests that benthic foraminifera represent a reliable archive of the deep water Nd isotope composition. Neodymium isotope values of benthic foraminifera from ODP Site 1264A (Angola Basin side of the Walvis Ridge) from the last 8 Ma agree with Fe-Mn oxide coatings from the same samples and are also broadly consistent with existing fish teeth data for the deep South Atlantic, yielding confidence in the preservation of the marine Nd isotope signal in all these archives. The marine origin of the Nd in the coatings is confirmed by their marine Sr isotope values. These important results allow application of the technique to down-core samples. The new epsilon-Nd datasets, along with ancillary Cd/Ca and Nd/Ca ratios from the same foraminiferal samples, are interpreted in the context of debates on the Neogene history of North Atlantic Deep Water (NADW) export to the South Atlantic. In general, the epsilon-Nd and delta13C records are closely correlated over the past 4.5 Ma. The Nd isotope data suggest strong NADW export from 8 to 5 Ma, consistent with one interpretation of published delta13C gradients. Where the epsilon-Nd record differs from the nutrient-based records, changes in the pre-formed delta13C or Cd/Ca of southern-derived deep water might account for the difference. Maximum NADW-export for the entire record is suggested by all proxies at 3.5-4 Ma. Chemical conditions from 3 to 1 Ma are totally different, showing, on average, the lowest NADW export of the record. Modern-day values again imply NADW export that is about as strong as at any stage over the past 8 Ma. |
format |
Dataset |
author |
Klevenz, Verena Vance, Derek Schmidt, Daniela N Mezger, Klaus |
author_facet |
Klevenz, Verena Vance, Derek Schmidt, Daniela N Mezger, Klaus |
author_sort |
Klevenz, Verena |
title |
Neodymium isotopes in benthic foraminifera from the South Atlantic |
title_short |
Neodymium isotopes in benthic foraminifera from the South Atlantic |
title_full |
Neodymium isotopes in benthic foraminifera from the South Atlantic |
title_fullStr |
Neodymium isotopes in benthic foraminifera from the South Atlantic |
title_full_unstemmed |
Neodymium isotopes in benthic foraminifera from the South Atlantic |
title_sort |
neodymium isotopes in benthic foraminifera from the south atlantic |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.712898 https://doi.org/10.1594/PANGAEA.712898 |
op_coverage |
MEDIAN LATITUDE: -27.244217 * MEDIAN LONGITUDE: 4.201979 * SOUTH-BOUND LATITUDE: -28.532680 * WEST-BOUND LONGITUDE: 2.845510 * NORTH-BOUND LATITUDE: -24.331667 * EAST-BOUND LONGITUDE: 8.250000 * DATE/TIME START: 1990-03-18T00:00:00 * DATE/TIME END: 2003-04-06T21:55:00 |
long_lat |
ENVELOPE(2.845510,8.250000,-24.331667,-28.532680) |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Klevenz, Verena; Vance, Derek; Schmidt, Daniela N; Mezger, Klaus (2008): Neodymium isotopes in benthic foraminifera: Core-top systematics and a down-core record from the Neogene south Atlantic. Earth and Planetary Science Letters, 265(3-4), 571-587, https://doi.org/10.1016/j.epsl.2007.10.053 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.712898 https://doi.org/10.1594/PANGAEA.712898 |
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.712898 https://doi.org/10.1016/j.epsl.2007.10.053 |
_version_ |
1766071018337599488 |