Neoproterozoic granitoid suites in southeastern Brazil are closely related to the different tectonic phases within the Brasiliano tectonic-thermal Event. Petrography, geochemistry and structural features allow to separate these rocks into pre-, syn-, late and post-tectonic granitoids. The whole emplacement process lasted about 100 Ma: from 595 Ma for the pre-tectonic granitoids, to near 490 Ma for the post-tectonic ones. During this interval a 45 Ma magmatic quiet period (from 582 to 537 Ma) can also be characterized. Detailed field observations and mapping, coupled with petrological and geochemical and observations, indicate the important role of the Archean and Paleoproterozoic crust in the genesis of these granitoids, showing even evidences of important mantle interactions.