Caracterização de sedimentos orgânicos em seções colunares no planalto meridional, Alto Uruguai, Rio Grande do Sul

Abstract

The Quaternary period, which began 2.5 million years ago (M.a.), covers the Pleistocene and Holocene, periods marked by climate change, characterized by colder periods, glacial periods and warmer periods or with temperatures similar to today's, which are interglacials. These changes can be recorded in the sedimentary record and can be studied through Quaternary Stratigraphy. In this context, the research characterized the organic sediments present in three columnar sections of the Southern Plateau, in Rio Grande do Sul. The study analyzed the organic sediments stratigraphically, based on color, tactile texture, granulometry and organic matter content, thus contributing, to develop a more robust paleoenvironmental framework for the region and thus understand the changes and environmental impacts in the area, caused by the climate changes that occurred in the Quaternary. The results provided data that demonstrate that in the samples from the columnar sections analyzed, there is a predominance of sediments with a high percentage of silt, clay and organic matter. These data are characteristic of muddy sediments rich in organic matter, deposited in environments with low depositional energy.