Conglomerate units of the Araguari Member, Bauru Group, western Minas Gerais State, Brazil

de Oliveira Luiz Antonio; Campos Jose Eloi Guimaraes

Geociencias (Sao Paulo) 22(1): 43-51


Accession: 018611446

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This paper is part of studies related to the hydrogeologic characterization of the Bauru Aquifer System in the Araguari region, State of Minas Gerais. The conglomeratic sequence of the Araguari Member, due to the characteristics of grain size and high porosity, constitutes the main groundwater reservoir of the area. The conglomeratic sequence is defined as the Araguari Member, and is included in the Marilia Formation, base of the Bauru Group. This sequence was observed for the first time in the Araguari region and represents a wide regional sedimentary cover, extending in parts of five municipalities of the Triangulo Mineiro region: Araguari, Uberlandia, Tupaciguara, Indianopolis and Monte Alegre de Minas. The analysis of the sedimentary structures, size and roundness of the clasts, support an interpretation of braided-river depositional systems of high-energy streams in terrain of considerable topographic gradient. The composition of the clast is represented predominantly by quartzite and quartz pebbles and the paleocurrent data indicate source of sediments from the Proterozoic basement, including the Araxa Group schist and related granites, situated northward of the depositional areas.