Morfologia e morfoscopia das coberturas pedológicas às margens do Rio Uruguai em Águas de Chápecó (SC)

Abstract

Knowledge and interpretation of the sedimentary record of surface coverage and pedological of soil landscape is a valuable tool for understanding the paleoenvironment and the Pleistocene / Holocene changes by which it had passed during the last thousand years of the Quaternary period. In this sense, from the pedoestratigráfico and morfoestratigráfico point of view, this work examined two pedological profiles in low hillside position, on the banks of the Uruguay River, on the border between Santa Catarina and Rio Grande do Sul, in order to understand the genesis of these pedological coverage and their paleoenvironmental context. The interest on these profiles was justified on the basis of being related to lithic and ceramic records associated with the first settlements of the Upper Uruguay River in Águas de Chapecó (SC), in the area directly affected by the HPP Foz do Chapecó. Through the morphological description of the profiles and morphoscopic analysis of its sands it is concluded that, despite the predominantly argillaceous of both profiles, there is heterogeneity of the pedological coverage in this area of the valley of Uruguay River, in detail scale. The morphoscopic analysis provided evidences of fluvial participation in both profiles, although it was not able to indicate characteristics associated with colluvial nature of them, as it would be expected due to the hillside morphology that is an integral part. The morphoscopic analysis proved inefficient to distinguish the origin of the genetic pedological horizons in terms of autochthonous and allochthonous of them, considering that all horizons showed predominance of smooth polished grains and subrounded and rounded.