Dating high-grade metamorphism by U-Pb, Sm-Nd and K-Ar isotopic systems: paleoproterozoic I-type granulites from the northern border of the Luis Alves gneiss-granulite terrane, southern Brazil - Harara, Ossama Mohamed Milad; Basei, Miguel Angelo Stipp; Siga Júnior, Oswaldo; Prazeres Filho, Hélcio José dos; Campos Neto, Mario da Costa (South American Symposium on Isotope Geology, 2003)