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Weathering rates at Alto Sorocaba basin, Brazil, using U-isotopes and major cations

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Abstract

The aim of this paper was to evaluate the chemical weathering rate at Alto Sorocaba basin, São Paulo State, Brazil, as it is an important parameter on geomorphological characterization of continents. Several tools may be used for such evaluation, and this work compares the results obtained from analytical data involving the uranium concentration, the 234U/238U activity ratio and the major cation concentration for samples of waters, soils, and rocks from that basin. The use of the natural uranium as a tracer in weathering rate rocks studies is advantageous since this element is virtually absent in rainwater and also allows obtaining the dissolution rocks coefficient by the 234U/238U activity ratio. The Alto Sorocaba basin has serious environmental problems in terms of the quality of the rainwater and river waters, and, consequently, the geochemical balance using the main cations presented some difficulties. However, measuring of the weathering rate utilizing the U-isotopes method corresponded to 14 μm/year that allows estimating a time of 72,000 years to weather 1 m of rock at Sorocaba River upstream from Itupararanga Reservoir, under the present climatic conditions.

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Acknowledgments

FAPESP (Foundation Supporting Research in São Paulo State) in Brazil is thanked for financial support for this investigation (Process No. 06/54884-3). Two anonymous referees are greatly thanked for helpful comments that improved the readability of the manuscript.

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  1. Instituto de Geociências e Ciências Exatas, IGCE, Universidade Estadual Paulista, UNESP, P.O. Box 178, Av. 24-A No. 1515, CEP 13506-900, Rio Claro, São Paulo, Brazil

    D. S. Sardinha, Daniel Marcos Bonotto & F. T. da Conceição

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  1. D. S. Sardinha
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  2. Daniel Marcos Bonotto
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  3. F. T. da Conceição
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Correspondence to Daniel Marcos Bonotto.

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Sardinha, D.S., Bonotto, D.M. & da Conceição, F.T. Weathering rates at Alto Sorocaba basin, Brazil, using U-isotopes and major cations. Environ Earth Sci 61, 1025–1036 (2010). https://doi.org/10.1007/s12665-009-0424-7

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