The U-Pb method was used in order to understand the high-grade metamorphic rocks in the Ribeira Belt (SE Brazil) and Lu-Hf isotopes were applied to investigate the magmatic photolith sources and the tectonic setting of Serra do Caparaó Complex rocks. The results indicate the existence of two thermal events: the first related to a Paleoproterozoic magmatic event and the second one linked to high-grade metamorphism related to the Brasiliano Orogeny. The U-Pb age interval from 2209 to 2060 Ma obtained in zircon grains from the granulitic orthogneiss with TDMcrustal ages ranging from 2.13 to 3.87 Ga may be interpreted as mantle-derived source with important older crust participation in the magma formation; juvenile arc-related rocks were generated at this time as indicated by the positive ƐHf values. The second group of U-Pb ages ranging from 633 to 584 Ma is interpreted as a metamorphic event, resulting from the collisional process related to the Gondwana assembly.
