Crystallization ages of the A-type magmatism of the Graciosa Province (Southern Brazil): constraints from zircon U-Pb (ID-TIMS) dating of coeval K-rich gabbro-dioritic rocks - Vlach, Silvio Roberto Farias; Siga Júnior, Oswaldo; Harara, Ossama Mohamed Milad; Gualda, Guilherme Augusto Rosa; Basei, Miguel Angelo Stipp; Vilalva, Frederico Castro Jobim (Journal of South American Earth Sciences, 2011)