Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling
The radiogenic neodymium isotope ratio 143Nd/144Nd (expressed as εNd) has been applied to examine seawater elemental budgets, sedimentary provenance, oceanic water mass source and circulation, large-scale geochemical cycling, and continental crust growth rates. These applications are underpinned by...
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European Association of Geochemistry
2018
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ftunivcam:oai:www.repository.cam.ac.uk:1810/286695 2024-01-14T10:03:21+01:00 Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling Hindshaw, RS Aciego, SM Piotrowski, AM Tipper, ET 2018 application/pdf https://www.repository.cam.ac.uk/handle/1810/286695 https://doi.org/10.17863/CAM.34002 eng eng European Association of Geochemistry http://dx.doi.org/10.7185/geochemlet.1828 Geochemical Perspectives Letters https://www.repository.cam.ac.uk/handle/1810/286695 doi:10.17863/CAM.34002 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 37 Earth Sciences 3703 Geochemistry Article 2018 ftunivcam https://doi.org/10.17863/CAM.34002 2023-12-21T23:24:56Z The radiogenic neodymium isotope ratio 143Nd/144Nd (expressed as εNd) has been applied to examine seawater elemental budgets, sedimentary provenance, oceanic water mass source and circulation, large-scale geochemical cycling, and continental crust growth rates. These applications are underpinned by the assumption that during sedimentary processing the parent/daughter (samarium/neodymium) ratio is conservative during low temperature fluid related processes. In this study, we report εNd data from two streams draining sedimentary formations in the Arctic archipelago of Svalbard. The εNd value of the dissolved load is offset from stream suspended sediment samples by up to 5.5 epsilon units. We demonstrate that dissolved load εNd is controlled by the dissolution of labile phases present in the catchment rocks which are isotopically distinct from the silicate residue and account for up to 12% Nd in the bulk sediment. This study highlights 1) the potential for incongruent release of Nd isotopes to seawater from rocks and sediments, with implications for the isotopic composition of seawater and 2) the large-scale decoupling between a rapidly exchanging labile reservoir and a silicate-bound reservoir during sediment recycling. This project was funded by a Swiss National Science Foundation fellowship for prospective researchers (PBEZP2-137335), a Marie Curie Intra-European Fellowship (PIEF-GA-2012-331501), and NERC Standard Grant NE/M001865/1. Fieldwork was supported by an Arctic Field Grant (219165/E10, The Research Council of Norway). Article in Journal/Newspaper Arctic Archipelago Arctic Svalbard Apollo - University of Cambridge Repository Arctic Norway Svalbard |
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Apollo - University of Cambridge Repository |
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language |
English |
topic |
37 Earth Sciences 3703 Geochemistry |
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37 Earth Sciences 3703 Geochemistry Hindshaw, RS Aciego, SM Piotrowski, AM Tipper, ET Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling |
topic_facet |
37 Earth Sciences 3703 Geochemistry |
description |
The radiogenic neodymium isotope ratio 143Nd/144Nd (expressed as εNd) has been applied to examine seawater elemental budgets, sedimentary provenance, oceanic water mass source and circulation, large-scale geochemical cycling, and continental crust growth rates. These applications are underpinned by the assumption that during sedimentary processing the parent/daughter (samarium/neodymium) ratio is conservative during low temperature fluid related processes. In this study, we report εNd data from two streams draining sedimentary formations in the Arctic archipelago of Svalbard. The εNd value of the dissolved load is offset from stream suspended sediment samples by up to 5.5 epsilon units. We demonstrate that dissolved load εNd is controlled by the dissolution of labile phases present in the catchment rocks which are isotopically distinct from the silicate residue and account for up to 12% Nd in the bulk sediment. This study highlights 1) the potential for incongruent release of Nd isotopes to seawater from rocks and sediments, with implications for the isotopic composition of seawater and 2) the large-scale decoupling between a rapidly exchanging labile reservoir and a silicate-bound reservoir during sediment recycling. This project was funded by a Swiss National Science Foundation fellowship for prospective researchers (PBEZP2-137335), a Marie Curie Intra-European Fellowship (PIEF-GA-2012-331501), and NERC Standard Grant NE/M001865/1. Fieldwork was supported by an Arctic Field Grant (219165/E10, The Research Council of Norway). |
format |
Article in Journal/Newspaper |
author |
Hindshaw, RS Aciego, SM Piotrowski, AM Tipper, ET |
author_facet |
Hindshaw, RS Aciego, SM Piotrowski, AM Tipper, ET |
author_sort |
Hindshaw, RS |
title |
Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling |
title_short |
Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling |
title_full |
Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling |
title_fullStr |
Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling |
title_full_unstemmed |
Decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling |
title_sort |
decoupling of dissolved and bedrock neodymium isotopes during sedimentary cycling |
publisher |
European Association of Geochemistry |
publishDate |
2018 |
url |
https://www.repository.cam.ac.uk/handle/1810/286695 https://doi.org/10.17863/CAM.34002 |
geographic |
Arctic Norway Svalbard |
geographic_facet |
Arctic Norway Svalbard |
genre |
Arctic Archipelago Arctic Svalbard |
genre_facet |
Arctic Archipelago Arctic Svalbard |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/286695 doi:10.17863/CAM.34002 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.34002 |
_version_ |
1788058196267499520 |