To investigate the uranium metallogenic ages and genesis of the Yangjiaonao uranium deposit,an elec-tron microprobe U-Th-Pb geochronological research was conducted on the pitchblende from this deposit.The re-sults show that the contents of Ca,Si,and Fe in the pitchblende from the Yangjiaonao uranium deposit were rela-tively low,and there was no significant correlation between(ω(SiO2)+ω(CaO)+ω(FeO))and(ω(UO2)+ω(PbO)),as well as ω(PbO).The U-Th-Pb chemical ages of the pitchblende ranged from 113.9 to 172.4 Ma,with a weighted average age of(141.6±3.2)Ma(MSWD=1.5,n=56),indicating that the mineralization oc-curred in the Early Cretaceous period.Combined with previous research results,it suggests that there was an earli-er stage of uranium mineralization in the Lujing ore field.This event coincides with the early uranium mineraliza-tion event in South China,indicating that the multi-stage uranium mineralization events in South China have all corresponding responses in the Zhuguang area.
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