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The impact of vegetation on fractionation of rare earth elements(REE) during water–rock interaction

Stille, Peter and Steinmann, M. and Pierret, M.-C. and Gauthier-Lafaye, François and Aubert, Dominique and Probst, Anne and Viville, Daniel and Chabaux, F. The impact of vegetation on fractionation of rare earth elements(REE) during water–rock interaction. (2006) Journal of Geochemical Exploration, vol. 88 (n° 1-3). pp. 341-344. ISSN 0375-6742

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Official URL: http://dx.doi.org/10.1016/j.gexplo.2005.08.070

Abstract

Previous studies on waters of a streamlet in the Vosges mountains (eastern France) have shown that Sr and rare earth elements (REE) principally originate from apatite dissolution during weathering. However, stream water REE patterns normalized to apatite are still depleted in light REE (LREE, La–Sm) pointing to the presence of an additional LREE depleting process. Speciation calculations indicate that complexation cannot explain this additional LREE depletion. In contrast, vegetation samples are strongly enriched in LREE compared to water and their Sr and Nd isotopic compositions are comparable with those of apatite and waters. Thus, the preferential LREE uptake by the plants at the root–water–soil (apatite) interface might lead to an additional LREE depletion of the waters in the forested catchment. Mass balance calculations indicate that the yearly LREE uptake by vegetation is comparable with the LREE export by the streamlet and, therefore, might be an important factor controlling the LREE depletion in river waters.

Item Type:Article
Additional Information:The original pulbication is available at http://www.sciencedirect.com/science/journal/03756742
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National des Etudes Spatiales - CNES
French research institutions > Centre National de la Recherche Scientifique - CNRS
French research institutions > Institut de Recherche pour le Développement - IRD
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Franche-Comté (FRANCE)
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Laboratory name:
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Deposited By:Florence Amor

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