Abstract
Abstract The Madina-Kouta basin is a southward extension of the upper Proterozoic Taoudeni basin. This sedimentary basin formed in a SW-NE tectonic fault zone in the Leo shield at ∼ 1000-800 Ma. The deposits indicate a quiet and slightly subsiding area. An important uncorformity allows us to distinguish two lithostratigraphic groups: the Segou Group below and the Madina-Kouta Group above. Sedimentation in this area ended with the Late Proterozoic glaciation 650-620 Ma. The correlations with the Taoudeni basin show a close relationship between the foreland area and the Mauritanides/Bassarides fold belt during the Pan-African I cycle (800-650 Ma). In particular we suppose that the lower part of the Taoudeni basin deposits which correlate with the Madina-Kouta Group (group of Souroukouto) is on the passive margin of the Pan-African I rift, and the post-Madina-Kouta deposits in the Taoudeni basin (Group of Bakoye) correspond to the molassic stage of the Pan-African I fold belt (rift closure stage).
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