Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A
This study presents neodymium isotope and elemental data for cleaned planktonic foraminifera from ODP site 758 in the southernmost reaches of the Bay of Bengal in the north-east Indian Ocean. Cleaning experiments using oxidative-reductive techniques suggest that diagenetic Fe-Mn oxyhydroxide coating...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.711291 2024-09-09T20:04:03+00:00 Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A Burton, Kevin W Vance, Derek LATITUDE: 5.384200 * LONGITUDE: 90.361200 * DATE/TIME START: 1988-06-15T23:50:00 * DATE/TIME END: 1988-06-24T13:30:00 2009 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.711291 https://doi.org/10.1594/PANGAEA.711291 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.711291 https://doi.org/10.1594/PANGAEA.711291 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Burton, Kevin W; Vance, Derek (2000): Glacial-interglacial variations in the neodymium isotope composition of seawater in the Bay of Bengal recorded by planktonic foraminifera. Earth and Planetary Science Letters, 176(3-4), 425-441, https://doi.org/10.1016/S0012-821X(00)00011-X 121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP dataset publication series 2009 ftpangaea https://doi.org/10.1594/PANGAEA.71129110.1016/S0012-821X(00)00011-X 2024-07-24T02:31:42Z This study presents neodymium isotope and elemental data for cleaned planktonic foraminifera from ODP site 758 in the southernmost reaches of the Bay of Bengal in the north-east Indian Ocean. Cleaning experiments using oxidative-reductive techniques suggest that diagenetic Fe-Mn oxyhydroxide coatings can be effectively removed, and that the measured Nd isotope composition reflects the composition of seawater from which the foraminiferal calcium carbonate was precipitated. Modern core-top Pulleniatina obliquiloculata and Globorotalia menardii give epsilon-Nd values of 310.12 +/- 0.16 and 310.28 +/- 0.16, respectively, indistinguishable from recent direct measurements of surface seawater in this area. A high-resolution Nd isotope record obtained from G. menardii for the past 150 kyr shows systematic variations (Delta epsilon-Nd = 3) on glacial-interglacial timescales. The timing of those variations shows a remarkable correspondence with the global oxygen isotope record, which suggests a process controlling the Nd isotope composition that responds in phase with global climate cycles. Palaeoclimate reconstruction indicates that during the last glacial maximum changes in monsoon circulation resulted in a reduction in rainfall over the Indian subcontinent, and a decrease in the flux of river water delivered to the Bay of Bengal. Thus, changes in the riverine input of Nd, a change in either flux or composition, most likely caused the isotope variations, although changes in dust source or local ocean circulation may have also played a role. These results clearly establish a link between climate change and variations in radiogenic isotopes in the oceans, and illustrate the potential of Nd isotopes in foraminifera for highresolution palaeoceanographic reconstruction. Other/Unknown Material Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Indian ENVELOPE(90.361200,90.361200,5.384200,5.384200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP |
spellingShingle |
121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP Burton, Kevin W Vance, Derek Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A |
topic_facet |
121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP |
description |
This study presents neodymium isotope and elemental data for cleaned planktonic foraminifera from ODP site 758 in the southernmost reaches of the Bay of Bengal in the north-east Indian Ocean. Cleaning experiments using oxidative-reductive techniques suggest that diagenetic Fe-Mn oxyhydroxide coatings can be effectively removed, and that the measured Nd isotope composition reflects the composition of seawater from which the foraminiferal calcium carbonate was precipitated. Modern core-top Pulleniatina obliquiloculata and Globorotalia menardii give epsilon-Nd values of 310.12 +/- 0.16 and 310.28 +/- 0.16, respectively, indistinguishable from recent direct measurements of surface seawater in this area. A high-resolution Nd isotope record obtained from G. menardii for the past 150 kyr shows systematic variations (Delta epsilon-Nd = 3) on glacial-interglacial timescales. The timing of those variations shows a remarkable correspondence with the global oxygen isotope record, which suggests a process controlling the Nd isotope composition that responds in phase with global climate cycles. Palaeoclimate reconstruction indicates that during the last glacial maximum changes in monsoon circulation resulted in a reduction in rainfall over the Indian subcontinent, and a decrease in the flux of river water delivered to the Bay of Bengal. Thus, changes in the riverine input of Nd, a change in either flux or composition, most likely caused the isotope variations, although changes in dust source or local ocean circulation may have also played a role. These results clearly establish a link between climate change and variations in radiogenic isotopes in the oceans, and illustrate the potential of Nd isotopes in foraminifera for highresolution palaeoceanographic reconstruction. |
format |
Other/Unknown Material |
author |
Burton, Kevin W Vance, Derek |
author_facet |
Burton, Kevin W Vance, Derek |
author_sort |
Burton, Kevin W |
title |
Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A |
title_short |
Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A |
title_full |
Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A |
title_fullStr |
Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A |
title_full_unstemmed |
Neodymium isotope composition of planktonic foraminifera from ODP Hole 121-758A |
title_sort |
neodymium isotope composition of planktonic foraminifera from odp hole 121-758a |
publisher |
PANGAEA |
publishDate |
2009 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.711291 https://doi.org/10.1594/PANGAEA.711291 |
op_coverage |
LATITUDE: 5.384200 * LONGITUDE: 90.361200 * DATE/TIME START: 1988-06-15T23:50:00 * DATE/TIME END: 1988-06-24T13:30:00 |
long_lat |
ENVELOPE(90.361200,90.361200,5.384200,5.384200) |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Supplement to: Burton, Kevin W; Vance, Derek (2000): Glacial-interglacial variations in the neodymium isotope composition of seawater in the Bay of Bengal recorded by planktonic foraminifera. Earth and Planetary Science Letters, 176(3-4), 425-441, https://doi.org/10.1016/S0012-821X(00)00011-X |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.711291 https://doi.org/10.1594/PANGAEA.711291 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.71129110.1016/S0012-821X(00)00011-X |
_version_ |
1809936084153401344 |