The emplacement of the Alto Turvo granitic massif, Graciosa Province, Southern Brazil: some constraints from LA-MC-ICP-MS zircon U-PB dating - Vlach, Silvio Roberto Farias; Vogado, Fabiana Pereira; Negri, Francisco de Assis; Pessoa, Atila Ferreira; Ferreira, Francisco José Fonseca (South American Symposium on Isotope Geology, 2012)