The mineralization temperature of the Xiayingfang gold deposit in Hebei is 370-290℃
230-170℃ and 150-80℃ in vanward-
main- and late-mineralization periodrespectively. Fission track ages of the zircon and apatite from the quartzsericitization zone of the gold district are 153.9Ma and 103.3Ma
respectively. Theages fall into major mineralization. time
and the metallogenetic period is more than50Ma. It is shown that fission track analysis of the minerals is useful to researchingthe metallogenetic epoch of hydrothermal deposits.