Hydrothermal alteration related to vein filling in amethyst-bearing basaltic rocks-São Gabriel/Planalto - RS

Authors

  • Rejane Maria Scopel CPGeo - Instituto de Geociências - IG, UFRGS, Porto Alegre, RS.
  • Milton Luiz Laquintinie Formoso Instituto de Geociências - IG, UFRGS, Porto Alegre, RS.
  • Alain Meurnier Université de Poitiers, Poitiers.
  • Patrick Dudoignon Université de Poitiers, Poitiers.

DOI:

https://doi.org/10.5902/2179460X26260

Abstract

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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References

AUBELE, J.C.; CRUMPLER, L.C.; WOLFGANG, E.E. 1978 Vesicle zonation and vertical structure of basalt flows. Journal of Volcanology and Geothermal Research, 35 Amsterdam, p. 349-374.

CROIVISIER, J.L. 1979 Téchnique d'induration superficiêlle pour la réalization de lames minces dans les materiaux poreaux. Cah Orstom, sér. Pedologie, 18 (31), p. 229-231.

KRISTMANNDOTTIR, H. 1978 Alteration of basaltic rocks by hydrothermal activity at 100 - 300. In: Procceedings International Clay Conference, M.M. Farmer, v.c. ed., p. 359-367.

MAACK, R. 1952 Die entwicklung der Gondwana schichten Sud-Brasiliens und ihre Beziehungen zur Karru Formation, Sud-Afrikas. In: Geochemical Stratigraphy of the Paraná Continental flood basalts: borehole evidence. Revista Brasileira de Geociências, Rio de Janeiro, 18 (21) p. 212-221.

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Published

1990-12-10

How to Cite

Scopel, R. M., Formoso, M. L. L., Meurnier, A., & Dudoignon, P. (1990). Hydrothermal alteration related to vein filling in amethyst-bearing basaltic rocks-São Gabriel/Planalto - RS. Ciência E Natura, 12(12), 111–118. https://doi.org/10.5902/2179460X26260

Issue

CIÊNCIA E NATURA, V. 12, N. 12, 1990

Section

Articles

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