Análise estrutural por sensoriamento remoto e caracterização da deformação rúptil na região das serras do Quebra-Rabicho e Taquari, Pirenópolis - GO

Abstract

This study presents a structural analysis based on lineaments obtained using remote sensing techniques, carried out in the region of Pirenópolis, in the state of Goiás. Geologically, the study area is part of the Pireneus Syntax, belonging to the Brasília Belt, formed during the amalgamation of Western Gondwana. The lithologies present in the area correspond to the units of the Rio do Peixe Metavolcanic-Sedimentary Sequence, Araxá Group, and Granites related to the Itapuranga Suite. Shaded relief images were used, with four azimuth directions, namely 00º, 45º, 90º, and 315º with illumination at 45º, produced from the ALOS PALSAR elevation model. Techniques for processing and interpreting shaded relief images were applied with the aim of highlighting structural features and characterizing deformation patterns. Subsequently, the results obtained were compared with structural data obtained from mapping carried out by Universidade Federal de Goiás (UFG). Analysis of the shaded relief images revealed a predominance of lineaments with E-W, N-S, and NE-SW directions. The E-W direction probably represents the structural control given by the main foliation and is reflected in the lineaments observed in the high spatial resolution image. This direction also reflects the orientations of the ridges observed in the Quebra Rabicho and Taquari mountain ranges. The other two directions, N-S and NE-SW, are well defined in the analysis of structural lineaments. These directions reflect the set of fractures observed in the field. They can be interpreted as conjugate pairs of Riedel-type fractures (R and R’), in which the principal stress (σ1) has a direction of N35 (N35E).