Denudation rates of the Quadrilátero Ferrífero (Minas Gerais, Brazil): Preliminary results from measurements of solute fluxes in rivers and in situ-produced cosmogenic Be |
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Authors: | Andr Augusto Rodrigues Salgado, R gis Braucher, Fabrice Colin, Hermí nio Arias Nalini, Jr., Ang lica Fortes Drummond Chicarino Varaj o,C sar Augusto Chicarino Varaj o |
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Affiliation: | aCEREGE-Europôle de l'Arbois BP80, 13545 Aix-en-Provence, France;bDepartamento de Geologia da Escola de Minas/UFOP, Brasil;cIRD, UR-037 98848 Nouméa, Cedex, New Caledonia |
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Abstract: | This paper investigates the denudation rates in the Quadrilátero Ferrífero, Minas Gerais State (Brazil). The aim is to compare chemical weathering rates from measurements of solute fluxes in rivers and long-term mean erosion rates deduced from in situ-produced cosmogenic 10Be concentrations measured in fluvial sediments. Both water samples and sediments were collected in fifteen stations (checkpoints) located in four hydrographic basins with low anthropogenic perturbations.Depending of the type of substratum, three degrees of chemical denudation rates from water samples are observed: (i) high rates in marbles; (ii) medium rates in schists, phyllites, granites, gneisses and migmatites; (iii) low rates in quartzites and itabirites. Preliminary results of long-term erosion rates deduced from in situ-produced 10Be are comparable with those of chemical rates. |
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Keywords: | Weathering Denudation Cosmogenic nuclides Quadrilá tero Ferrí fero |
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