The Jianglang dome is located in the western margin of the Yangtze block, with metavolcanic and metasedimentary rocks of the Liwu Group occurring in its core. In order to accurately constrain the forming age and tectonic setting of these strata, we performed LA-ICP-MS zircon U-Pb geochronological and geochemical studies in this paper. The zircon U-Pb dating results show that the detrital zircons in the metasedimentary rocks have ages ranging from 2521 Ma to 262 Ma, with a weighted mean 206Pb/238U age of 552.8±5.7 Ma (MSWD = 2.1,n= 6) for the youngest magmatic zircons. The metasedimentary rocks have variable SiO2 contents (53.48%~96.08%) with obvious negative Eu anomalies (Eu/Eu* = 0.50~0.67), enrichment in large ion lithophile elements (e.g., Rb, Ba and U) and depletion in high field strength elements (e.g., Nb, Ta, Zr, Hf and Ti); these rocks exhibit similar REE and trace element patterns to the continental upper crust. The metavolcanic rocks have low SiO2 contents (39.92%~48.27%) with flat REE and trace element patterns, similar to those of EMORB. Combining with zircon U-Pb dating results of the metavolcanic rocks (542±9.0 Ma), we propose that the Liwu Group was formed in the Late Neoproterozoic (553~542 Ma), rather than the Mesoproterozoic or Paleoproterozoic as previously documented. The source of metasedimentary rocks was mainly from the Neoproterozoic geological bodies of the western Yangtze block. The metavolcanic and metasedimentary rocks were both formed in a subductionrelated tectonic setting after the convergence of Gondwana supercontinent. In addition, the age spectrum of detrital zircons reveals that the Archean to Palaeoproterozoic metamorphosed basements may exist in the Jianglang dome, where also have geological age records of the Rodinia supercontinent convergencedisintegration processes and the Caledonian movement.