Proterozoic and paleozoic evolution of Atlantic area of North-Patagonian Massif, Argentine - Varela, Ricardo; Cingolani, Carlos Alberto; Sato, Anna María; Dalla Salda, L; Brito Neves, Benjamim Bley de; Basei, Miguel Angelo Stipp; Siga Júnior, Oswaldo; Teixeira, Wilson (South American Symposium on Isotope Geology, 1997)