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The paper characterizes the depositional model and the diagenetic evolution of the Uberaba Formation, the lowermost unit of Bauru Group, Upper Cretaceous of the Parana Basin. The Uberaba Formation is geographically restricted to the Triângulo Mineiro region and consists of medium-grained sandstones, conglomerates, pebbly sandstones and siltstones. Its framework consists of quartz, feldspars, rock fragments (basalt, quartzites, schists, sandstones) and sandstone intraclasts. These rocks can be classified as lithic sandstones, sublithic sandstones and feldspathic lithic sandstones. The presence of thick conglomeratic sequences — consisting of sandstone intraclasts — near Serra do Verissimo, is interpreted as due to tectonic activity in this area during the deposition of the Uberaba Formation. The diagenetic evolution may be divided into eodiagenetic and mesodiagenetic stages. The eodiagenesis is represented by the following aspects: a) presence of large volumes of volcanic dust due to the volcanic activity in the Alto Paranaiba region, which were mechanically infiltrated in the intergranular pores of rocks; b) autigenesis of zeolite and silica; c) autigenesis of iron oxides, dolomites, calcretes, silcretes, attapulgite and sepiolite. The mesodiagenesis is marked by formation of calcite and barite, the former being the most important phase in volume. The textural relationships as well as the reddish colors of cathodoluminescence due to the high Mn content suggest the mesodiagenetic origin of calcite. The sedimentary environments characterized by braided river complex controlled the development of the autigenic minerals, during the eodiagenesis. The high permeability of these rocks is related to the textural heterogeneity, which allowed the influx of meteoric water. The framework constituents of these rocks were the main source of material for the diagenetic phases.

PETROGRAFIA E DIAGÊNESE DA FORMAÇÃO UBERABA, CRETÁCEO SUPERIOR DA BACIA DO PARANÁ NO TRIÂNGULO MINEIRO