Abstract:

The U Pb isotopic dating of zircon in the mafic granulite which derived from mafic cumulate from the Larsemann Hills, East Antarctica, suggested that a granulite facies metamorphic event earlier than the Pan African event (500Ma) possibly occurred in the middle of Neoproterozoic in this region. The U Pb discordia of zircon in the mafic granulite mainly composed of Opx Cpx Pl Qtz is 772.4+71.1/-48.0(2σ)Ma.Combining with the field evidence, this result possibly represents the earlier mid pressure granulite facies metamorphic event recognized in this region and maybe corresponds to the Rodinia event.