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Influence of discharge on silicate weathering dynamics of the Tietê river basin : major cations and dissolved silica approach

Mortatti, Jefferson and Probst, Jean-Luc and Fernandes, Alexandre Martins and Mortatti, B.C. and Oliveira, Helder Influence of discharge on silicate weathering dynamics of the Tietê river basin : major cations and dissolved silica approach. (2008) Geochimica Brasiliensis, vol. 22 (n° 1). pp. 15-26. ISSN 0102-9800

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Official URL: http://sbgq.org.br/publicacoes/periodicos/geochimica-brasiliensis

Abstract

The Tietê river water was investigated in terms of the seasonality of major cations and dissolved silica mainly due to the influences of discharges in the watershed, in order to recognize the main rock weathering type occurring in the basin. With the proposed geochemical model it was possible to identify, after atmospheric and anthropogenic input corrections, the main chemical species released from the silicate weathering in the basin and their relationship with the river discharge. With the Re index calculated for the basin (3.09) it was possible to identify the main weathering process occurring in the basin and the transition of the stability field of monosiallitization to bisiallitization, with no significant seasonal variations in the river water discharge.

Item Type:Article
Additional Information:Thanks to Sociedade Brasileira de Geoquimica editor. The definitive version is available at http://www.sbgq.org.br/ The original PDF of the article can be found at Geochimica Brasiliensis website : http://www.sbgq.org.br/publicacoes/revistas.php
Audience (journal):National peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Universidade de São Paulo - USP (BRAZIL)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Universidade Estadual de Campinas - Unicamp (BRAZIL)
Laboratory name:
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Deposited By: Florence Amor

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