Geologia e arcabouço estrutural do Complexo Lagoa Real, vale do Paramirim, Centro-Oeste da Bahia

Abstract

The Lagoa Real Complex is consti- tuted by 1.7 Ga granitoids that occur along the Paramirim valley. The granitoids are formed by the São Timóteo Granite and a set of alkali-gneisses that were crystallized during a compressional sin-metamorphic deformation episode. The carried out structural analysis has identified two deformation patterns. The compressional episode is represented by shear zones, compositional layering, milonite foliation and folds. The extensional episode is characterized by the nucleation of normal shear zones. The geometric patterns of the finite deformation are similar to the ones that occur in the Ituaçu synclinal where the Salitre e Bebedouro formations of Una Group outcrop. An ancient geometric pattern was not found in the area; consequently we propose that the deformation episodes were related to the neoproterozoic Orogeny.