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Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765

Abstract

PINTO, Viter M  and  HARTMANN, Léo A. Flow-by-flow chemical stratigraphy and evolution of thirteen Serra Geral Group basalt flows from Vista Alegre, southernmost Brazil. An. Acad. Bras. Ciênc. [online]. 2011, vol.83, n.2, pp.425-440. ISSN 0001-3765.  https://doi.org/10.1590/S0001-37652011000200006.

The geochemical characterization of thirteen Serra Geral Group flows in the Vista Alegre region (RS-SC), southern Brazil, displays the homogeneous basaltic composition near 50 wt.% SiO2. Each of the five basal flows (Pitanga-type, high-Ti/Y ~600, TiO2 > 3 wt.%) and eight upper flows (Paranapanema-type, medium Ti/Y ~400, TiO2 > 2 wt.%) can be identified from their chemical composition; sets of flows have parallel variation in chemical composition. The flow-by-flowcorrelation in four sections shows the horizontal position of the flows in three profiles and an approximately 200-m downdrop of the Itapiranga block with respect to the Frederico Westphalen block. The world-class amethyst geode mineralization and the systematic presence of native copper in the basalts make the correlation of great geological and economic significance.

Keywords : Geochemical correlation; basalt; stratigraphy; Serra Geral Group; Vista Alegre.

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