Sediment contamination in floodplains and alluvial terraces as an historical record of gold exploitation in the Carmo River basin, Southeast Quadrilátero Ferrífero, Minas Gerais, Brazil.
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2006
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Resumo
This paper describes the geochemistry of sediment samples placed in floodplains and alluvial
terraces downstream from gold mines in the Carmo River basin, Quadril tero Ferr fero, Minas
Gerais, Brazil. The geochemistry signature Na2O, K2O, SiO2, CaO, MgO, Al2O3, Fe2O3, TiO2, P2O5,
Mn, As, Cu, Zn, Ba, Ni, Cr, S, Co were analyzed in different facies from stratigraphic profiles. As,
Cu, Zn, and Mn anomalies are mainly associated with the clayed facies deposited in floodplains
and oxbow lakes, and with coarse-sediment facies deposited in the channel. The facies were accumulated
by the gold exploitation activity in the region. The contamination of As, Cu, and Zn
was controlled by minerals such as iron oxides and hydroxides (hematite, magnetite, and mainly
goethite), manganese oxides, and sulfide-rich minerals. The As-bearing sediments of the
region characterize one of the most As contaminated area of Brazil. Their main source is associated
with gold exploration in the last three centuries.
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Sediment geochemistry, Heavy meta, Gold mining
Citação
COSTA, A. T. et al. Sediment contamination in floodplains and alluvial terraces as an historical record of gold exploitation in the Carmo River basin, Southeast Quadrilátero Ferrífero, Minas Gerais, Brazil. Acta Hydrochimica et Hydrobiologica, v. 34, p. 245-256, 2006. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1002/aheh.200400625/abstract>. Acesso em: 20 de jun. 2017.