Análise micromorfológica e a utilização do GPR no entendimento da pedodiversidade

Abstract

Pedodiversity is understoodas the variation of the soil classes in a given spatial unit, inthis way it is intrinsically relatedto terrestrial modeling. This research was carried out in the Southern portion of Serra do Espinhaço in the Depression of Gouveia. This region presents some singularities regarding the pedogeomorphological evolution, since this is formed by the retraction of the quartizitic escarpments of the Espinhaço Supergroup, generating the exhumation of the basement and, consequently, a new configuration of the landscape as alteration of the base level, grooving of fluvial channels, colluvium, among others. This research was carried out using the methodology of BOULET et al. (1982), which allows a detailed analysis, contributing to the understanding of soil organization. By means of this, it was possible to determine the points of interest for the micromorphological analysis. Another technique used was the GPR (Georadar), to identify the formations that would be in situ and the colluvial formations from the use of antennas of 100MHz. Soil texture analyzes, which revealed a granulometric sequence with large amount of clay in some sampled profiles, revealing a high degree of weathering. Micromorphology was a technique of great importance in the precise identification of the characteristics of the profiles, it was not possible to identify clear evidence of coluvial formation. Chemical analyzes provided important results, mainly in relation to the evolution of the weathering mantle. Finally, the GPR technique helped a lot in the conclusions about the origin of the detrital pavement. Determining fact, to understand the material as being in situ. From this characterization, it becomes evident that there is no way to understand and characterize the soils of a certain region, without there being no in-depth study of geomorphology, important for studies with these purposes.