First evidence for expressive Neoproterozoic intraplated mafic rocks and magma mixing in post-collisional A-PA type granites, Southern Brazil: Geochemistry and U-Pb (zircon), Nd-Sr-18O(zircon) isotope investigations - Harara, Ossama Mohamed Milad; Basei, Miguel Angelo Stipp; Siga Júnior, Oswaldo (South American Symposium on Isotope Geology, 2001)