Origin of the Rapakivi texture and other features related to felsic-basic magma interaction in the Salto Pluton, Itu granitic province, SE Brazil: petrographic and geologic evidences - Janasi, Valdecir de Assis; Vlach, Silvio Roberto Farias; Alves, Adriana (Symposium on Magmatism, Crustal Evolution, and Metallogenesis of the Amazonian Craton, 2006)