Nature and evolution of fluids associated with specularite-bearing Fe and Au-PGE (Jacutinga) mineralization during the Brasiliano orogeny in the eastern São Francisco Craton, Minas Gerais, Brazil

Hydrothermal fluids related to the development of the Araçuaí Orogen during the Brasiliano Cycle have affected Paleoproterozoic banded iron formation-bearing sequences along the eastern border of the São Francisco Craton. Controversy surround the origin of specularite in high-grade schistose iron ore-bodies in the Serpentina Range (“Serpentina-type” ore) versus specularite-rich, S-free Au-PGE quartz veins (“Jacutinga-type”) that occur at the...