Sensitive High Resolution Ion Microprobe (SHRIMP IIe/MC) of the Institute of Geosciences of the University of São Paulo, Brazil: method and first results - Sato, Kei; Tassinari, Colombo Celso Gaeta; Basei, Miguel Angelo Stipp; Siga Júnior, Oswaldo; Onoe, Artur Takashi (Geologia USP. Série Científica, 2014)