Caracterização e análise estrutural da antiforme do Godinho, região de Passo da Cuia (RS)

Abstract

The Porongos Complex represents a important unit for determining the geotectonic evolution of the south of the Mantiqueira Province. The supracrustal sequence comprises metavolcanosedimentary rocks interspersed with marbles, ultramafic rocks and granites, affected by metamorphism located between the lower greenschist and upper amphibolite facies, and has the recognition of at least five deformational events. As a result of these events, foliations are generated, folds that vary from centimeter scales to large regional antiforms that extend for tens of kilometers, in addition to faults. The present work aims to contribute to present and propose the construction of a structural evolution on a regional scale in the centralsouthern portion of the Porongos Complex, based on interpretations of multispectral and radar images, geological mapping at a scale of 1:15,000, structural and petrographic analysis. At the end of the structural characterization, five deformational events D1, D2, D3, D4, D5 were recognized, the first four having a ductile nature and the last one having a ductile-brittle nature, responsible for the generation of folds, foliations, crenulation and lineation in the gneisses. of the Encantadas basement and in the ortho- and para-derived units of the Porongos Complex, represented, respectively, by metavolcanics and associations of metapelites, quartzites and marbles in the study area.