Isotopic study of the Pb-Zn (Cu-Ag) Santa Maria Deposit, Caçapava do Sul Region, Rio Grande do Sul, Brazil

The Camaquã Mines, in the central-southern region of Rio Grande do Sul State, Brazil, contain largest deposits base metals (Camaquã, Cu; Santa Maria, Pb-Zn) Basin. host rocks are consisted sandstones and conglomerates Bárbara Group interbedded volcanic undefined stratigraphic position. Peperitic features were identified a mineralized trachytic sill. An age 565 ± 5 Ma (U-Pb LA-MC-ICP-MS) was obtained for another rock, which allowed identification, first time, Acampamento Velho Formation Mines region. Stratigraphic relations demonstrate that both represent this magmatism. Data from Pb isotopes spatial relationship observed field indicate possible genetic link between mineralization. isotopic data also suggest predominantly older crustal source (1.07 Ga model age) possibly other metals, with intermediate or mixed origin, suggesting magmatic-hydrothermal fluids leached percolated basement.