Abstract
This study focuses on the eastern flank of the Santa Rita syncline (Dorr 1969DORR, J. V. N. II. Physiographic, stratigraphic and structural development of the Quadrilátero Ferrífero, Minas Gerais, Brazil . USGS/DNPM. Professional Paper 641-A., 1969. 110p.), with specific emphasis on the region known as Fábrica Nova. Important iron ore deposits are located on the flanks of this structure, such as Timbopeba, Alegria, São Luiz, Tamanduá, Almas and Fábrica Nova. The Santa Rita syncline is a fold with N-S axial direction and of subregional scale, with roots in the adjacent basement of the Santa Bárbara Complex and sectioned by the Água Quente thrust fault. The hypothesis of this study is that the structural framework of the region resulted from the superposition of at least three deformation phases on the Ouro Preto nappe. The Fábrica Nova mine, located in the central portion of the study area, is embedded in a synformal structure with a 100/20 trending axis named Fábrica Nova synform. The proposed model to explain the particular structural geometry of this region is based on the flanking folding mechanism (Passchier 2001PASSCHIER, C. W. Flanking structures. Journal of Structural Geology, v. 23, p. 951-962, 2001.). This mechanism may have been developed by E-W crustal shortening during the F4 tectonic deformation phase.
Keywords:
Geologia Estrutural; Quadrilátero Ferrífero; Sinclinal Santa Rita; Mina de Fábrica Nova
