U-Pb Shrimp geochronology and isotope chemostratigraphy (C, O, Sr) of the tamengo formation, southern Paraguay belt, Brazil - Babinski, Marly; Boggiani, Paulo César; Fanning, Christopher Mark; Fairchild, Thomas R.; Simon, C. M.; Sial, Alcides Nobrega (South American Symposium on Isotope Geology, 2008)