TECHNOGENIC SEDIMENTS IN ALLUVIAL PLAIN IN PRESIDENTE PRUDENTE-SP

Technogenic depositions present different characteristics according to the places where they are formed. This article presents relevant contributions to interpretation of technogenic sedimentary materials, specifically in sand fraction (between 0,053mm and 2mm), studied in an alluvial plain in the city of Presidente Prudente-SP. Aiming to recognize the materials present in the depositions and relate them to their likely sources, it was accomplished sample collection, visual identification of the materials in the samplers, granulometric analysis, fractioning of the sand fraction and light microscopy. As a result, it was recognized the presence of fragments of burnings, plastic, building material and carbonate nodules. These materials were related to the track record of use and occupation of the land, and it was observed difficulties to recognize some of these materials as manufactured due to the visual similarity with fragments of the local rocky basis (sandstone of Adamantina Formation, Bauru Group). It was concluded that the presence of charcoal fragments in deep layers are related to burnings accomplished during the first phases of agricultural expansion in the region and the manufactured materials come from the allotment area and from the former domestic solid waste deposit.