Distribuição e contexto geológico-geomorfológico das ocorrências de bauxita na região de Espera Feliz, Minas Gerais/Espírito Santo

Abstract

This work conducted a geological and geomorphological characterization of bauxíticas occurrences in the southern border of the states of Minas Gerais and Espírito Santo, in the region understood as Espera Feliz, near the Serra do Caparaó from multispectral data Aster sensor, diffraction-rays X and spectroscopy. The SAM classification technique (Spectral Angler Mapper) was applied from spectroscopic reference curves of 5 bauxite points collected in area at 9 bands of Aster sensor for occurrences of spatial. The X-ray diffraction showed the presence of the following mineral constituents of the local bauxite: Gibbsite, Kaolinite, Hematite, Goethite, Water and Quartz identified also in their points of spectroscopic absorption which further demonstrates the existence of a differentiated level of degradation between samples collected in the field. The degradation is related mainly with geomorphological medium in which they are allocated. The results in the classification SAM were distributed on all geological compartments of the region and, after fieldwork, mostly there were the relationship of bauxíticas occurrences as being associated with the geological formations of the Caparaó region, namely: orthogneisses the suite Caparaó and Granite, as are most prominent in the genesis bauxitic, as shown by previous research. The essential mineralogy of bauxite was confirmed both spectral as mineralogically, thus confirming the line between techniques in mineral characterization and serving subsidies in identifying the spatial occurrence of aluminous minerals from orbital images.