Evaluation of the mineral exploration influence on sediment composition in the Gualaxo do Norte River Basin (MG-Brazil) based on geochemical and stratigraphic data.
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Data
2012
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Resumo
The aim of this study was to investigate the
influence of mining on the geochemical composition of the
alluvial sediments of the Gualaxo do Norte River Basin,
located in the eastern-southeastern portion of the Quadrila
´tero Ferrı´fero (Minas Gerais State, Brazil). The analysis
of the sedimentological succession was carried out
using 16 stratigraphic sections (cutbanks and alluvial terraces)
and analysis of 111 sediment samples for major- and
trace-elements by ICP-OES. The stratigraphic analysis
revealed the deposition history of the collected sediments.
Anomalous concentrations of certain elements such as As
and Pb were found, which are associated with stratigraphic
facies with evidences of gold artisanal mining, and Fe
anomalies associated with iron ore mining. The classification
of the sections was possible by means of principal
component analysis. From the sediment characteristics,
three groups were identified: (1) those influenced by iron
ore mining and gold artisanal mining; (2) those influenced
by iron ore mining and (3) those with no influence of
human activities.
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Trace elements, Environmental geochemistry, Cutbank, Alluvial terrace
Citação
RODRIGUES, A. S. de L. Evaluation of the mineral exploration influence on sediment composition in the Gualaxo do Norte River Basin (MG-Brazil) based on geochemical and stratigraphic data. Environmental Earth Sciences, v. 65, p. 1, 2012. Disponível em: <https://link.springer.com/article/10.1007/s12665-012-1799-4>. Acesso em: 20 jun. 2017.