A series of subvolcanics associated with gold deposi ts occur in the Kanggur gold district. From the RbSr isochronic age and  207 Pb／206Pb age of single zircon acquired by surface evaporation, the su b volcanics were formed at 300～282 Ma. The 207Pb／206Pb age ( 593 Ma) of single zircon of quartzsyenite porphyry reflects that the intrusion of subvolcanics is accompanied by capture of paleozircon of the basement rock s , and further infers that Precambrian continental basement possibly exists below the AqishanYamansu volcanic island arc.