Petrological and geochronological constraints on the origin of HP and UHP kyanite-quartzites from the Sulu orogen, Eastern China

► The Ky-quartzites occur both the HP and UHP metamorphic belts of the Sulu orogen. ► Their protoliths were Neoproterozoic granitoids. ► The granitoids have been partly transformed into Al-rich rocks during subduction of continent. ► The Neoproterozoic rocks in the north margin of Yangtze block experienced coherent metamorphism.