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This paper aims to reconstruct the quaternary events of sedimentary fi ll and the consequent morphogenetic confi guration of river valley bottoms in the Paraopeba river basin, São Francisco Craton, Minas Gerais state, Southeastern Brazil. Morphogenetic processes were investigated, and also the geomorphological context associated with the genesis, evolution and spatial organization of thick sedimentary packages present at the bottom of the valleys affl uents of middle/lower Paraopeba river-MG. In the most part of the analyzed valleys, up to three fl uvial depositional levels were identifi ed a fl oodplain, a level of terrace, and an altered depositional level due to colluvial deposition (N1, N2 and N3, respectively). Based on the analysis of the spatial arrangement of the depositional levels, granulometry and the organization of the river deposit facies, this paper proposes at least four regional sedimentary events on that regions (ESR1, ESR2, ESR3 and ESR4), which may be associated with tectonic and lithostructural controls. ESR1 is the oldest event and is represented by the N3 deposits. These deposits are indicative of depositional conditions with greater energy. ESR2 and ESR 3 events are represented by the N2 of the medium courses and the N2 of the lower courses from the affl uents of the right margin, respectively. Local sedimentation events are associated with the formation of N2 and N1 in the upper courses of the Ouro and das Lajes riverside and of the N1 in the medium courses of all tributaries, which may correspond to chronologically diff erent depositional events. Considering the staggered depositional levels, the organization of drainage and the results of the morphometric analysis, it is possible to infer that tectonic conditioning was responsible for uplifts and/or tilting in the region. The rich structural picture was inherited from the Transamazônico and Brasiliano cycles. It consists of faults and shear zones that have been reactivated over geological time and may favor regional tectonic control. On the other hand, lithological control plays an important role in the organization of river deposits. The basic dikes and quartz veins are responsible for the establishment of local base levels in some rivers stretches and favor the preservation of N2 deposits at diff erent altimetric levels. The LOE dating data suggest that ESR2 occurred between 17,600 ± 2,780 and 15,800 ± 2,500 years BP, the N2 sedimentation event in the High Course stretches of the Ouro and das Lajes riverside occurred between 6,250 ± 1,100 and 2,850 ± 420 years BP and the ESR3 occurred between 2,750 ± 420 and 1,250 ± 190 years BP.

EVENTOS QUATERNÁRIOS DE ENTULHAMENTO E CONFIGURAÇÃO DE FUNDOS DE VALE NA BACIA DO RIO PARAOPEBA – CRÁTON DO SÃO FRANCISCO, SUDESTE DO BRASIL