The Upper Triassic Nadi Kangri Formation, which delineates an E—W zoned array within the northern Qaingtang basin, northern Xizang (Tibet), is mainly composed of felsic tuff and pyroclastic rocks, andesite and rhyolite with basalt. In this study, a representative dacitic tuff sample collected from the volcanic rocks at the base of the sedimentary—volcaniclastic rocks above the unconformity in the Juhua Mountain area is selected to be analysized for the SHRIMP zircon UPb dating, and geochemical characteristics and petrogenesis have been also studied in this paper. The dacitic tuff gives a SHRIMP zircon UPb age of 216±4.5 Ma, which represents the age of the Late Triassic volcanic—sedimentary events in the Juhua Mountain area. The Nadi Kangri Formation volcanic rocks (without higher ignition loss samples)in the Juhua Mountain area of northern Qiangtang Basin, northern Xizang (Tibet), are characterized by higher contents of SiO2 ranging from 60.30% to 67.14%, and higher A/CNK (0.88～1.31), and lower Mg# (ranging from120.85 to 56.98 with an average of 42.13). High REE contents and marked fractionation between LREE and HREE, with weak negative Eu anomalies, were observed in all the samples. Rb, Ba, Th, K, and other largeion lithophile elements (LILE) was significantly enriched, Sr, P and Ti were depleted obviously, compared with La and Th, Nb—Ta were relatively depleted, and the high field strength elements and REE patterns of the Nadi Kangri Formation volcanic rocks are similar to those of the middle and upper crust, implying a probable source of these volcanic rocks with the middle and upper crust.