Mineralogia da fração areia aplicada à identificação de descontinuidades estratigráficas em perfis pedológicos. Bacia do Córrego do Quebra, Gouveia/MG

Abstract

The Depression of Gouveia has been the target of several studies which aims at characterizing the quaternary sediments regionally described as alluvial and colluvial deposits. This area is also marked by strong pedogenesis, responsible for the stratification traces loss of the Quaternary sediments. This work aims to contributing to the stratification discontinuity identification and characterization based on sand fraction mineralogical analysis from four soil profiles: P1, P2, P3 and P4. The occurrence of one discontinuity was admitted at Profile P1: between the horizons C1 and 2C2 market by stone-line. No discontinuity was admitted at P2. It was observed at P3 the occurrence of discontinuity between the horizons Bi and 2C based on the increase in depth of kaolinite in detriment to muscovite. It was observed at P4 the occurrence of discontinuity between the horizons BA and 2Bw1. It is important to point out that in some discontinuities mineralogical characterization has corroborated traces previously identified on the morphological analysis. It was not possible to observe an occurrence pattern between the stratigraphic discontinuities and the stone lines described to the soil profiles.