Integração multi-fonte de dados em mineralizações na porção oeste do Terreno São Gabriel, Caçapava do Sul/RS

Abstract

In the state of Rio Grande do Sul, the so-called Sul-Riograndense Shield, located in the southern sector of the Province of Mantiqueira, is recognized by researchers as an important witness to the evolution of the South American platform, mainly due to the peculiar rock formations, mineralizations and potential associated mineral deposits. Specifically, the rocks of the metamorphic basement and the Camaquã Basin comprise several occurrences of base and precious metallic minerals with marked structural control. Considering these elements, this work has as main objective to detect features, discontinuities and magnetic signatures associable to mineral occurrences by applying geophysical data in the western portion of the São Gabriel Terrane, south of the municipality of Caçapava do Sul, in state of Rio Grande do Sul. Initially, data from aeromagnetometry and remote sensing (indirect data) were integrated with lithological-structural and mineralization data (direct information) from the bibliography, in which it was possible to verify the relation of mineralizations with high magnetics as well as to refine and suggest previously unmapped bodies and structures. Through geological mapping, description of the lithotypes and associated copper mineralization and in situ magnetic susceptibility measurements, it is possible to verify the absence of structural control in the outcrop portion of the mineralization, which is inserted in magnetic lows and there is little contrast of magnetic susceptibility between the lithotypes, and through preliminary petrographic characterization it is possible to describe the mineralization and the different stages of cementation of the host rock. Despite the outcrop portion being considered as supergenic, such a conclusion cannot be adopted in depth due to the diverse bodies and structures characterized through geophysics. Furthermore, the results obtained in this work constitute an important subsidy for exploratory research on a detailed scale, enabling the optimization of financial and human resources, through the guidance of soil sampling campaigns, trenches and drilling with core recovery in targets.