Tracing Sources of Geochemical Anomalies in a Deeply Buried Volcanic-Related Hydrothermal Uranium Deposit:the Daguanchang Deposit,Northern Hebei Province,North China Craton  

作　　者：Yangyang Zhang Yuelong Chen Dapeng Li Huan Kang Mingliang Fang Yunliang Xu 

机构地区：[1]School of Earth Science and Resources,China University of Geosciences,Beijing,100083,China [2]State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing,100083,China [3]Jinchuan Group Company Limited,Jinchang,737104,China [4]China-Explo Tian Cheng(Beijing)Technology Company Limited,Beijing,100093,China

出　　处：《Journal of Earth Science》2024年第4期1186-1195,共10页地球科学学刊（英文版）

基　　金：supported by the National Key Research and Development Project of the Ministry of Science and Technology of the People’s Republic of China,“Penetrating Geochemical Exploration Technology”(No.2016YFC0600604).

摘　　要：Radon(Rn)and helium(He)gases from uranium decay form distinct anomalies related to buried uranium deposits.In order to trace the geochemical anomalous sources from the volcanic-related uranium deposits in deeply buried areas,systematical Rn contents and He isotope ratios were analyzed from the Daguanchang uranium deposit.The soil gas Rn concentrations above the deep uranium are ten times higher than those in barren areas,indicating that instantaneous Rn content measurements can be used to detect deeply buried uranium.The helium isotope ratios(^(3)He/^(4)He)of the unmineralized samples from the mineralized drill hole(ZK1)are relatively lower and uniform compared to those of the samples from no-mineral drill hole(ZK2).However,the Th and U contents of the drill core samples from ZK1 are slightly lower than those of the samples from ZK2,indicating that the lower 3He/4He ratios in ZK1 are most likely due to the addition of 4He from underlying uranium intervals.The differences in the instantaneous Rn contents are consistent with the variations in the He isotope ratios of the drill core samples.These results demonstrate that soil gas Rn and ^(3)He/^(4)He ratios are useful tracers and can indicate the existence of deeply buried volcanic-related hydrothermal uranium ores.

关 键 词：tracers RADON helium ^(3)He/^(4)He ratio uranium deposits Daguanchang deposit 

分 类 号：P632[天文地球—地质矿产勘探] P619.14[天文地球—地质学]