Geological and geophysical data integration for delimitation of mineralized areas in a supergene manganese deposits
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Data
2014-01-01
Autores
Moreira, César Augusto [UNESP]
Rezende Borges, Mario [UNESP]
Lira Vieira, Glauber Matheus [UNESP]
Malagutti Filho, Walter [UNESP]
Fernándes Montanheiro, Mariana Aparecida [UNESP]
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Resumo
Geophysical methods are widely used in mineral exploration. This paper discusses the results of geological and geophysical studies in supergene manganese deposits of southern Brazil. Mineralized zones as described in geological surveys were characterized as of low resistivity (20Ω.m) and high chargeability (30ms), pattern found also in oxides and sulfite mineral deposits. Pseudo-3D modeling of geophysical data allowed mapping at several depths. A relationship between high chargeability and low resistivity may define a pattern for high grade gonditic manganese ore. Large areas of high chargeability and high resistivity may result in accumulation of manganese and iron hydroxides, due to weathering of the gonditic ore, dissolution, percolation and precipitation.
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chargeability, deposit, electrical resistivity, manganese, supergenic
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Geofisica Internacional, v. 53, n. 2, p. 199-210, 2014.