The Xinzhou-Hetai area is a chief gold belt in Guangdong, where there are the famous Hetai and Xinzhou gold deposits as well as some prospective gold occurrences of different types. There was no immediate geochronologic information on gold mineralizations before our work and their ages were determined only by inference based on geological data. We have got isotopic ages of the sericites (and muscovites)associated with gold in the main gold deposits and occurrences using 40Ar/39Ar method. All the samples were irradiated in the core of the fact- lily H4 of 49-2 reactor. Incremental heating experiments were performed on a mass spectrometer MM-1200. The standard biotite ZBH-25 was used as‘ flux monitor'. When J-value is corrected for the position of the sample in the reacter,the rela- five Variance can be about士 l%. According to the dating values obtained,there are four stages of gold minera- lization;esrly Jurassic (184-171Ma)，late Jurassic (141士6Ma)，early Cretaceous (132士2Ma)and late Cretaceous (99士1 Ma).