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Influence of geology in the geochemistry signature of Itacolomi State Park waters, Minas Gerais-Brazil

Abstract

In all geological scenarios, mineral water reactions will affect the water chemistry. As such, water resources in different rocks commonly involve different hydrogeological compartments. The aim of this work is to evaluate the influence of geology in the geochemistry signature of Itacolomi State Park waters. To do so, a survey of the geological units in the area was carried out, a geological/stratigraphic division was made, and its correlation with the main geological events was determined. Using the advantages of GIS, all the catchments were delimited. Based on this division, near 30 stream and lake segments were chosen for analyses. In each point, all physiochemical properties of the water were measured, and samples were collected to determine the concentrations of major and trace elements by ICP–OES. The dynamics of the Itacolomi State Park rock-soil and stream water solutions suggest that mixing of drainage waters from different bedrock and soil sources regulates stream water physical–chemical parameters and solute concentrations. The analytical data showed a clear correlation between the chemical compositions of the solute and the geological characteristics of the catchment. Units that are covered by iron oxide hardpan (Manso unit) and iron-banded formations (Custódio unit) show a large amount of soluble elements, including high values of Fe and Mn. On the other hand, the presence of high values of Al and K (Itacolomi unit) are a direct consequence of the presence of quartzite associated with low pH values.

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Correspondence to Maria Augusta Gonçalves Fujaco.

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Leite, M.G.P., Fujaco, M.A.G., Nalini, H.A. et al. Influence of geology in the geochemistry signature of Itacolomi State Park waters, Minas Gerais-Brazil. Environ Earth Sci 60, 1723–1730 (2010). https://doi.org/10.1007/s12665-009-0306-z

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  • DOI: https://doi.org/10.1007/s12665-009-0306-z

Keywords

  • Hydrogeochemistry
  • Water–rock interactions
  • Stream
  • Itacolomi State Park
  • Brazil