The Mesoproterozoic- Neoproterozoic tectonic evolution of the northern Yangtze Craton is of great significance to the Precambrian geological evolution of South China. Here the authors report U- Pb ages and Hf isotope compositions of the zircons in block (garnet- amphibolite) and matrix (metasedimentary rock) in the Kangjiawan mélange of the Hongan block, western Dabie orogen. The results show that the garnet- amphibolite protolith was formed at 1064±10 Ma, and has undergone fluid overprinting at 183±3 Ma. The Hf isotope compositions (εHf(t) =4. 7～12. 3) of the zircons having the age of 1064 Ma in the garnet- amphibolite are close to the depleted mantle value, indicating that the garnet- amphibolite protolith (basaltic rock) may have been derived from partial melting of the depleted mantle. The U- Pb ages of detrital zircons in the metasedimentary rock cluster at: 2576 Ma, 2065～1698 Ma, 1071～560 Ma and 254～156 Ma, suggesting that the provenances of the metasedimentary rock are mainly from the Early Precambrian basement of the nearby Qingling- Dabie orogenic belt. The youngest magmatic zircon in the metasedimentary rock has an age of ~240 Ma, indicating that the final formation time of the Kangjiawan mélange may be between the Late Triassic and the Early Jurassic. Combined with the Neoproterozoic tectonic evolution process in the Qinling- Dabie orogenic belt, this study proposed that the Hongan block in the Dabie orogenic belt, the Miaowan ophiolite and the Shennongjia arc in the Yangtze craton constitute the Late Mesoproterozoic- Early Neoproterozoic arc system, supporting the assumption that the Yangtze craton may have been gradually assembled from a series of microcontinents.