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Rousseau TC, Sonke JE, Chmeleff J, et al. Rapid neodymium release to marine waters from lithogenic sediments in the Amazon estuary. Nat Commun. 2015;6:7592doi: 10.1038/ncomms8592.
Rousseau, T. C., Sonke, J. E., Chmeleff, J., van Beek, P., Souhaut, M., Boaventura, G., Seyler, P., & Jeandel, C. (2015). Rapid neodymium release to marine waters from lithogenic sediments in the Amazon estuary. Nature communications, 67592. https://doi.org/10.1038/ncomms8592
Rousseau, Tristan C C, et al. "Rapid neodymium release to marine waters from lithogenic sediments in the Amazon estuary." Nature communications vol. 6 (2015): 7592. doi: https://doi.org/10.1038/ncomms8592
Rousseau TC, Sonke JE, Chmeleff J, van Beek P, Souhaut M, Boaventura G, Seyler P, Jeandel C. Rapid neodymium release to marine waters from lithogenic sediments in the Amazon estuary. Nat Commun. 2015 Jul 09;6:7592. doi: 10.1038/ncomms8592. PMID: 26158849; PMCID: PMC4510642.
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Nat Commun. 2015 Jul 09;6:7592. doi: 10.1038/ncomms8592.

Rapid neodymium release to marine waters from lithogenic sediments in the Amazon estuary.

Nature communications

Tristan C C Rousseau, Jeroen E Sonke, Jérôme Chmeleff, Pieter van Beek, Marc Souhaut, Geraldo Boaventura, Patrick Seyler, Catherine Jeandel

Affiliations

  1. GET, Université de Toulouse, CNRS, IRD, CNES, 14 Avenue Edouard Belin, Toulouse F-31400, France.
  2. LEGOS, Université de Toulouse, CNRS, IRD, CNES, 14 Avenue Edouard Belin, Toulouse F-31400, France.
  3. Universidade De Brasilia, UNB, LAGEQ, Campus universitário Darcy Ribeiro, Brasilia, DF 70.910-900, Brazil.
  4. Hydrosciences Montpellier, Université de Montpellier-IRD-CNRS, Place Eugène Bataillon 34000, France.

PMID: 26158849 PMCID: PMC4510642 DOI: 10.1038/ncomms8592

Abstract

Rare earth element (REE) concentrations and neodymium isotopic composition (ɛNd) 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 μm), colloidal and particulate REE and ɛNd 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 ɛNd 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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