Neodymium isotopic variations in seawater
New data for the direct measurement of the isotopic composition of neodymium in Atlantic Ocean seawater are compared with previous measurements of Pacific Ocean seawater and ferromanganese sediments from major ocean basins. Data for Atlantic seawater are in excellent agreement with Nd isotopic measu...
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Online Access: | https://doi.org/10.1016/0012-821X(80)90124-7 |
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ftcaltechauth:oai:authors.library.caltech.edu:ptq2m-zg440 2024-06-23T07:54:51+00:00 Neodymium isotopic variations in seawater Piepgras, Donald J. Wasserburg, G. J. 1980-10 https://doi.org/10.1016/0012-821X(80)90124-7 unknown Elsevier oai:authors.library.caltech.edu:ptq2m-zg440 eprintid:42085 https://doi.org/10.1016/0012-821X(80)90124-7 resolverid:CaltechAUTHORS:20131028-084240231 info:eu-repo/semantics/closedAccess Other Earth and Planetary Science Letters, 50(1), 128-138, (1980-10) info:eu-repo/semantics/article 1980 ftcaltechauth https://doi.org/10.1016/0012-821X(80)90124-7 2024-06-12T02:18:24Z New data for the direct measurement of the isotopic composition of neodymium in Atlantic Ocean seawater are compared with previous measurements of Pacific Ocean seawater and ferromanganese sediments from major ocean basins. Data for Atlantic seawater are in excellent agreement with Nd isotopic measurements made on Atlantic ferromanganese sediments and are distinctly different from the observed compositions of Pacific samples. These results clearly demonstrate the existence of distinctive differences in the isotopic composition of Nd in the waters of the major ocean basins and are characteristic of the ocean basin sampled. The average ε_(Nd)(0) values for the major oceans as determined by data from seawater and ferromanganese sediments are as follows: Atlantic Ocean,ε_(Nd)(0) ≅ −12 ± 2; Indian Ocean,ε_(Nd)(0) ≅ −8 ± 2; Pacific Ocean,ε_(Nd)(0) ≅ −3 ± 2. These values are considerably less than ε_(Nd)(0) value sources with oceanic mantle affinities indicating that the REE in the oceans are dominated by continental sources. The difference in the absolute abundance of ^(143)Nd between the Pacific and Atlantic Oceans corresponds to ∼106 atoms ^(143)Nd per gram of seawater. The correspondence between the ^(143)Nd/^(144)Nd in seawater and in the associated sediments suggests the possible application of this approach to paleo-oceanography. Distinctive differences in ε_(Nd)(0) values are observed in the Atlantic Ocean between deep-ocean water associated with North Atlantic Deep Water and near-surface water. This suggests that North Atlantic Deep Water may be relatively well mixed with respect to Nd isotopic composition whereas near-surface water may be quite heterogeneous, reflecting different sources for surface waters relative to deep water. This suggests that it may be possible to distinguish the sources of water masses within an ocean basin on the basis of Nd isotopic composition. The Nd isotopic variations in seawater are used to relate the residence time of Nd and mixing rates between the ... Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Caltech Authors (California Institute of Technology) Indian Pacific Earth and Planetary Science Letters 50 1 128 138 |
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Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
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unknown |
description |
New data for the direct measurement of the isotopic composition of neodymium in Atlantic Ocean seawater are compared with previous measurements of Pacific Ocean seawater and ferromanganese sediments from major ocean basins. Data for Atlantic seawater are in excellent agreement with Nd isotopic measurements made on Atlantic ferromanganese sediments and are distinctly different from the observed compositions of Pacific samples. These results clearly demonstrate the existence of distinctive differences in the isotopic composition of Nd in the waters of the major ocean basins and are characteristic of the ocean basin sampled. The average ε_(Nd)(0) values for the major oceans as determined by data from seawater and ferromanganese sediments are as follows: Atlantic Ocean,ε_(Nd)(0) ≅ −12 ± 2; Indian Ocean,ε_(Nd)(0) ≅ −8 ± 2; Pacific Ocean,ε_(Nd)(0) ≅ −3 ± 2. These values are considerably less than ε_(Nd)(0) value sources with oceanic mantle affinities indicating that the REE in the oceans are dominated by continental sources. The difference in the absolute abundance of ^(143)Nd between the Pacific and Atlantic Oceans corresponds to ∼106 atoms ^(143)Nd per gram of seawater. The correspondence between the ^(143)Nd/^(144)Nd in seawater and in the associated sediments suggests the possible application of this approach to paleo-oceanography. Distinctive differences in ε_(Nd)(0) values are observed in the Atlantic Ocean between deep-ocean water associated with North Atlantic Deep Water and near-surface water. This suggests that North Atlantic Deep Water may be relatively well mixed with respect to Nd isotopic composition whereas near-surface water may be quite heterogeneous, reflecting different sources for surface waters relative to deep water. This suggests that it may be possible to distinguish the sources of water masses within an ocean basin on the basis of Nd isotopic composition. The Nd isotopic variations in seawater are used to relate the residence time of Nd and mixing rates between the ... |
format |
Article in Journal/Newspaper |
author |
Piepgras, Donald J. Wasserburg, G. J. |
spellingShingle |
Piepgras, Donald J. Wasserburg, G. J. Neodymium isotopic variations in seawater |
author_facet |
Piepgras, Donald J. Wasserburg, G. J. |
author_sort |
Piepgras, Donald J. |
title |
Neodymium isotopic variations in seawater |
title_short |
Neodymium isotopic variations in seawater |
title_full |
Neodymium isotopic variations in seawater |
title_fullStr |
Neodymium isotopic variations in seawater |
title_full_unstemmed |
Neodymium isotopic variations in seawater |
title_sort |
neodymium isotopic variations in seawater |
publisher |
Elsevier |
publishDate |
1980 |
url |
https://doi.org/10.1016/0012-821X(80)90124-7 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Earth and Planetary Science Letters, 50(1), 128-138, (1980-10) |
op_relation |
oai:authors.library.caltech.edu:ptq2m-zg440 eprintid:42085 https://doi.org/10.1016/0012-821X(80)90124-7 resolverid:CaltechAUTHORS:20131028-084240231 |
op_rights |
info:eu-repo/semantics/closedAccess Other |
op_doi |
https://doi.org/10.1016/0012-821X(80)90124-7 |
container_title |
Earth and Planetary Science Letters |
container_volume |
50 |
container_issue |
1 |
container_start_page |
128 |
op_container_end_page |
138 |
_version_ |
1802647147842109440 |