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Dissolved silica in the Garonne River waters: changes in the weathering dynamics

Semhi, Khadija and Amiotte Suchet, Philippe and Clauer, Norbert and Probst, Jean-Luc Dissolved silica in the Garonne River waters: changes in the weathering dynamics. (2000) Environmental Geology, 40 (1-2). 19-26. ISSN 0943-0105

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Official URL: http://dx.doi.org/10.1007/s002540000119


The major ion chemistry of the Garonne River is indicative of seasonal variations in the weathering dynamics of the drainage basin. Using the geochemical model MEGA for calculation of the contribution of atmospheric CO2 to the total bicarbonate fluxes exported by the Garonne River allows estimations of the concentrations of the major dissolved elements that originate from silicate- and carbonate-rock weathering. The molecular ratio SiO2/Al2O3 was calculated for the 1989–1992 period to identify the main type of weathering in the Garonne River, and montmorillonite was shown to be the major mineral occurring in the weathering products. The seasonal variations of the SiO2/Al2O3 ratio also showed that removal of silica was accelerated during humid periods.

Item Type:Article
Additional Information:Thanks to Springer-Verlag editor. The original publication is available at www.springerlink.com The definitive version is available at http://www.springerlink.com/content/jphgm4vyqe0959vn/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:30 Mar 2011 08:17

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