The sedimentology, stratigraphy and tectonic context of the Sao Francisco Supergroup at the Southwestern Domain of the Sao Francisco craton, Brazil

Abstract

Neoproterozoic metasedimentary rocks of the Sao Francisco Supergroup occur in the Southwest part of Sao Francisco Craton. Three informal lithostratigraphic units composed mainly by psephites, pelites and carbonates represent the Sao Francisco Supergroup. The last two units formed in storm influenced muddy shelf and platform/ramp systems, respectively. The psephitic unit crops out as isolated bodies nearby the external zone of the southernmost part of Brasilia Fold and Thrust Belt. Its origin is related to fan delta systems that developed eastward, in a foreland basin, as a result of erosion of metamorphic rocks of Brasilia Fold and Thrust Belt.