Análise Geofísica Da Região Do Rio Conceição, Quadrilátero Ferrífero, Associados a Dados De Campo, Petrográficos E De Imagens Aéreas

Abstract

The Quadrilátero Ferrífero region, located in the southeast portion of the São Francisco Craton, is one of the main metallogenic provinces in Brazil. Fieldwork, petrography, high-resolution airborne geophysics (magnetic and gamma-ray spectrometry data), and aerial images allowed us to produce a new map at the 1:25,000 scale, with important contributions in the lithotypes detailing, understanding of the geological structures and relationship between the different stratigraphic units. Interpretation of airborne geophysical data integrated with field structural and lithological observations were successfully employed in the creation of the litho-structural framework in a poorly exposed Proterozoic and Archean terrain. Airborne gamma-ray spectrometry data aided in the mapping process in areas with regolith cover including erosional ridges. The magnetic total derivative image revealed regional and local structures. In addition, our work details the units of occurrence of Rio das Velhas and Minas Supergroup. The aerial coverage of the Mindá and Santa Quitéria formations strongly increased, as well as the area of the Cauê Formation was better defined. The new geological map provides many improvements over the pre-existing maps. New lithological facies and structures were identified and others become more visible and lithologicalboundaries are refined or confirmed.

Remote sensing applied to geological, structural, and mass movements characterization in the connection between Curral Homocline and Moeda Syncline, Quadrilátero Ferrífero Region, Brazil

“…As summarized by Roncato et al (2015) and Roncato et al (2020), about Minas Supergroup, this 2.60-2.10 Ga (Machado et al 1996, Hartmann et al 2000 unit is subdivided into the Caraça, Itabira, Piracicaba, and Sabará Groups (Dorr 1969), all metamorphosed at low greenschist facies. The basal Caraça Group has metaconglomerate, quartzite, and phyllite (Renger et al 1994).…”

“…1982, Romano 1989, Noce 1995, Endo and Machado 1997, Farina et al 2016, Dutra 2017, Roncato et al 2020.…”