Zircon SHRIMP and LAICPMS UPb dating was performed on diabase gabbro of premineralization stage and dioritic porphyrite dykes of mineralization stage, collected from the Xiaoxinancha Au and Curich deposit, both of which have closely relation in spatial distribution. The results show that five sets of concordant ages for 16 zircon grains or spots from diabasegabbro are obtained, i.e. 387.0±11.8Ma, 292.0~251.1Ma (Mean=270 ±14Ma, n=10), 129.8±2.6 Ma, 107.0～95.6Ma (Mean=103±13Ma,n=3) and 46.8±2.6Ma; whereas one set of concordant ages ranging from 108～98Ma (Mean=102.1±2.2Ma,）for 11 zircon grains and 12 spots from diorite porphyrite are obtained. Combined with the features of CL images, it was suggested that the premineralization diabasegabbro was formed in the late Early Permian epoch and trapped some detrital zircons during magma ascending (intruding) and subsequently experienced thermal modifications in the early Cretaceous and middle Eocene time. Diorite porphyrite was formed in the late Early Cretaceous. Considering the match of the age of diorite porphyrite with age 107.0～95.4Ma of the diabase gabbro, the ages of hydrothermal zircons from the diabase gabbro range between 103~95.4Ma, which further indicates that thermal event of the goldcopper mineralization took place in 108～98Ma and the mineralization occurred during the late stage of middle/late Mesozoic when the crust experienced intensive extension and thinning. Then, the gold and copperrich deposit was exposed to the present surface due to uplifting and denudation processes during the late Cretaceous Paleocene period. In general, the mineralization was 10Ma behind the largescale magmatichydrothermal gold mineralization (120Ma) in East China during the late Mesozoic.