| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Rapid neodymium release to marine waters from lithogenic sediments in the Amazon estuary
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| Autores: |
Rousseau, Tristan C. C.
Sonke, Jeroen E.
Chmeleff, Jerome
Van Beek, Pieter
Souhaut, Marc
Boaventura, Geraldo
Seyler, Patrick
Jeandel, Catherine
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| Data: |
2015-07-09
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| Ano: |
2015
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| Palavras-chave: |
Earth sciences
Biogeochemistry
Oceanography
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| Resumo: |
Rare earth element (REE) concentrations and neodymium isotopic composition (epsilon Nd) are tracers for ocean circulation and biogeochemistry. Although models suggest that REE release from lithogenic sediment in river discharge may dominate all other REE inputs to the oceans, the occurrence, mechanisms and magnitude of such a source are still debated. Here we present the first simultaneous observations of dissolved (< 0.45 mu m), colloidal and particulate REE and eNd in the Amazon estuary. A sharp drop in dissolved REE in the low-salinity zone is driven by coagulation of colloidal matter. At mid-salinities, total dissolved REE levels slightly increase, while epsilon Nd values are shifted from the dissolved Nd river endmember (- 8.9) to values typical of river suspended matter (- 10.6). Combining a Nd isotope mass balance with apparent radium isotope ages of estuarine waters suggests a rapid (3 weeks) and globally significant Nd release by dissolution of lithogenic suspended sediments.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00298/40952/40046.pdf
https://archimer.ifremer.fr/doc/00298/40952/40047.pdf
DOI:10.1038/ncomms8592
https://archimer.ifremer.fr/doc/00298/40952/
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| Editor: |
Nature Publishing Group
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| Formato: |
application/pdf
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| Fonte: |
Nature Communications (2041-1723) (Nature Publishing Group), 2015-07-09 , Vol. 6 , N. 7592 , P. 1-8
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| Direitos: |
2015 Macmillan Publishers Limited. All rights reserved.
info:eu-repo/semantics/openAccess
restricted use
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