The amphibolitefacies and granulitefacies metamorphic rocks in the Lhasa terrane, south Tibet, were considered traditionally as the Precambrian metamorphic basement, but the related geochronological evidence is lack. In this paper, we report a metamorphic age of ~720 Ma obtained from zircons of a marble collected from the Naguo area of northern Lhasa terrane. This data, together with the coeval magmatism in the same area, indicate that the northern Lhasa terrane has been subjected to the NeoPaleozoic tectonicthermal event. Based on this result and some Mesozoic and Cenozoic ages obtained recently from the highgrade metamorphic rocks in the central and southern segments of the Lhasa terrane, we propose a preliminary temporal and spatial evolution model for the multistage metamorphic processes of the Lhasa terrane.