Abstract
This paper presents the sedimentary evolution and a new stratigraphy suggested by the rift phase of the Macaúbas Group and Espinhaço Supergroup of the Araçuaí orogen, located at the Macaúbas River basin (Minas Gerais State). The Espinhaço Supergroup is formed by the Resplandecente Formation (aeolian depositional system). Paleocurrent data indicate that the source area of the Resplandecente Formation was the São Francisco craton region. The Macaúbas Group represents the precursor basin of the Neoproterozoic Araçuaí orogen and the pre-glacial sedimentation is represented by two units: Matão and Duas Barras formations. The basal unit of the Macaúbas Group - Matão Formation - is formed by lower breccia and conglomerates and represents deposition under unstable conditions, covered by a thick package of fine sandstone (shallow marine transgressive sediments). Detrital zircon grains dated at ca. 1.16 Ga (U-Pb SHRIMP) limit the maximum age of the Matão Formation. Duas Barras Formation represents pre-glacial marine sediments. Both São Francisco craton and Congo craton could be the source for Duas Barras sediments
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