Pedomorfogeologia e mapeamento digital de solos com horizonte B textural e B nítico em uma área piloto no Planalto Central do Brasil

The knowledge of the behavior and distribution of soils with argillic horizons in the Plateau Brazilian Central region is still scarce, mainly based on generalized soil surveys. However, you can remedy this deficiency by means of detailed studies that can provide the understanding of the relationships between source material, geomorphic surfaces and genesis of soils formed. The aim of this study was to characterize and classify the soil with argillic horizons in representative geo-toposequences of the Ribeirão Salinas, Distrito Federal (DF), in order to understand the pedogenesis and filiation pedogenetic of these soils in the Central Brazilian Plateau. Soil profiles were selected in three representative geo-toposequences, located in the DF Third geomorphological area, developed from lithologies of Paranoá and preferably Canastra Group. Soil characterization was made by morphological, physical, chemical, mineralogical and geochemical analysis. Was determined the mineralogical composition through X-ray diffractometry and fluorescence X-ray analysis was used to determine the soils geochemistry composition. . The morphological characteristics of soils geotopossequences were similar, differing primarily on the chemical and physical characteristics. Ki and Kr indices indicated a low degree pedogenetic evolution of soils studied. The mineralogy have predominance of illite and kaolinite clay minerals, and the geochemistry, the most significant constituent oxides were K2O and TiO2. The soils were classified in the 4th category level of the Brazilian System of Soil Classification. Key-words: soil genesis, mineralogy, geochemical, study of geo-toposequences.