Sedimentary provenance in the southern sector of the São Francisco Basin, SE Brazil

• DOI: 10.1590/2317-4889201820170061
• Publication Date: 2018-04-07T19:15:35Z
• Authors: Gustavo Macedo de...; Marly Babinski
• Keywords: Siliciclastic

We present new Sm-Nd, U-Pb and Hf isotope geochronological data for the siliciclastic rocks in southern sector of São Francisco Basin. An abrupt change Sm-Nd is observed from Carrancas Formation’s oligomitic conglomerates (TDM ages between 2.7 3.3 Ga; εNd(550 Ma) values -25.09 -17.98), its finer facies, facies Moema Laminite 1.4 to 2.1 -9.46 -5.59). No further significant changes occur farther upwards Bambuí Group (Sm-Nd TDM within 1.3-2.0 Ga interval; -9.53 -4.09), showing a lack reorganization source areas throughout deposition basin. This yet another argument dismiss an unconformity Group. The presence index fossil Cloudina sp. lower Sete Lagoas Formation makes glaciation probably Late Ediacaran age. detrital zircons range Archean early Ediacaran, but current insufficient distinguish contribution sources Brasília Araçuaí belts.