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Alteração hidrotermal de preenchimento de um veio de Rocha Basáltica associada às ametistas - Vila São Gabriel/Planalto, Rio Grande do Sul

1990; UNIVERSIDADE FEDERAL DE SANTA MARIA; Volume: 12; Issue: 12 Linguagem: Inglês

10.5902/2179460x26260

ISSN

2179-460X

Autores

Rejane Maria Scopel, Milton Luiz Laquintinie Formoso, Alain Meurnier, P. Dudoignon,

Tópico(s)

Iron oxide chemistry and applications

Resumo

Clay minerals, zeolites, calcite and silica (quartz, opal and chalcedony) are the most common hydrothermal alteration products of the basalts with veins in São Gabriel (Planalto) Region. The petrographic and geochemical studies led to the identification of the secondary phases which fill the veins. From the border to the centre, the filling of the veins comprises: a) brown clay mineral (ferri-montmorillonite), b) prismatic zeolite (heulandite) and/or fibro-radiated saponite/chlorite, and c) interstratiphied saponite/chlorite.

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