Caracterização mineralógica dos solos por difração de raio-x da mina de Itataia-CE

Abstract

The research site is located in Itataia Farm in Santa Quitéria in the state of Ceará. Fitting into the Province Borborema in Ceará Central Domain, with a package of supracrustal rocks of sedimentary nature, consisting dominantly by marbles, schists and gneisses the two-mica, with garnet and / or sillimanite, calcissilicáticas rocks and quartzites metamorphosed in amphibolite facies high. Being, the field of match-uranífera nature, occurring in the form of uranífero colofanito, and the main ore body has a length of 800 meters and variable width 250-400 meters. The ore occurs from the surface to a depth of approximately 180m. Mineralogical studies of soils in this region are scarce, however, this knowledge is of great importance both in characterization and classification of soils, such as the elucidation of its genesis, which assumes great importance ranking of the heavy residue of sand fractions. The characterization of these soils data was with the aid of the soil map of the State of Ceará made by Embrapa and the contribution of the technique of X-ray Diffraction (XRD), which represents one of the main techniques for microstructural characterization of crystalline materiais, where, in ali analytical chemistry methods for characterization of materiais, XRD is only able to provide qualitative and quantitative information of the mineral constituents of a mixture. Porting, based on these data has been that the study area is included in a region with Argissolos red / yellow eutrophic, with inclusions of lithic Neosols luvisols and eutrophic, with a predominante of three minerais: quartz, fluoropatita, calcium carbonate and oxide uranium, and the presence of major classes of argilosminerias as kaolinite, vermiculite and montmorillonite.