Detailed geological mapping of the Sopa-Brumadinho Formation (Espinhaço Supergroup) in the area of the Extração Diamondiferous Field (Diamantina, MG), identified a series of sedimentary continental deposits. These deposits indicate the transition from a quiescent tectonic regime with braided rivers to another regime controlled by rift-related faults in the basin, with the development of incised fluvial deposits and alluvial fans. By the facies analysis supported in the identification of architectural elements of this formation, were recognized seven lithofacies associations (A1 to A7) that characterize the evolution of the depositional systems of Espinhaço Supergroup in the area. Diamond occurrences that are known in the old local mines can be related to A2 Association and, probably, also to A3 Association.
Sedimentary lithofacies; Sopa-Brumadinho Formation; Diamantina town (MG)
