CARACTERIZAÇÃO FACIOLÓGICA DO FILITO BRANCO da REGIÃO de ITAPEVA-SP

Abstract

The phyllite explored in the region of Itapeva-SP is included in the metasedimentary deposits of Proterozoic age that belong in the ltaiacoca Group. Regionally these metasedimentary deposits are concealed by the Furnas Formation, which became an important prospective guide for the material of higher commercial value. The phyllite deposits occur in the form of interdigital body of aleatory contours that are differentiated by the coloration in three facies: white facies, which possesses the highest commercial value and it is mainly commercialized for the use as a melting in the white ceramics production; pink facies and black facies that have fractions commercialized in their improved form (grounded and homogenized) for the use in the fields of animal feed or fillers. The distinction of these facies does not occur only for their coloration, but also for physical and chemical parameters, where the difference of obtained contents of Fe2O3total', Al2O 3, SiO2 and the loss on ignition, cause variation in properties such as degree of refractory and color of burning of the material. The search chemical, mineralogical, petrographical and physical analyses defined the existing difference between the facies of the phyllite; analytical data also made it possible, together with the field information, to claim the origin of this material through the action of weathering processes, which through hydrolysis had caused the chemical composite mobility of pink and black facies originating the material of better commerce of the white facies.