Metallogenic Age and Geological Significance of the Yangjiaonao Uranium Deposit in the Southern Part of Lujing Ore Field
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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