气体地球化学测量方法在皂火壕砂岩型铀矿勘查中的应用试验研究  

Application Study of Gas Geochemical Survey Method in The Exploration of Zaohuohao Sandstone Type Uranium Deposit

作　　者：刘汉彬[1] 韩娟[1] 石晓[1] 张建锋[1] 金贵善[1] 李军杰[1] 张佳[1] 丁迎军 石雅静 LIU Hanbin;HAN Juan;SHI Xiao;ZHANG Jianfeng;JIN Guishan;LI Junjie;ZHANG Jia;DING Yingjun;SHI Yajing(Beijing Research Institute of Uranium Geology,Beijing 100029,China;Jiangsu Branch of Geological Exploration Center of China National Construction Minerals Industry,Nanjing,Jiangsu 211135,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]中国建筑材料工业地质勘查中心江苏总队,江苏南京211135

出　　处：《铀矿地质》2023年第2期287-301,共15页Uranium Geology

基　　金：核能开发项目“塔里木盆地砂岩铀矿元素-同位素地球化学预测方法研究”(编号:HTLM2101-06)资助。

摘　　要：在鄂尔多斯盆地东北部皂火壕铀矿床孙家梁地段进行土壤SO_(2)、H_(2)S、CO_(2)、Rn、He气体地球化学测量试验,讨论了各气体组分在氧化-还原带不同亚带内地球化学分布特征及其控制因素,探讨了气体地球化学圈定砂岩型铀矿氧化、还原环境及矿体范围的可能性。孙家梁地段土壤气体H_(2)S、SO_(2)、CO_(2)、Rn背景值分别为0.03×10^(-6)、0.049×10^(-6)、120.6×10^(-6)、2804.4Bq∕m^(3),异常下限分别为0.078×10^(-6)、0.115×10^(-6)、3997.5×10^(-6)、3670.1Bq∕m^(3)。CO_(2)、H_(2)S、SO_(2)等非放射性气体浓度从氧化亚带到过渡亚带总体上呈逐渐上升,而后在还原亚带下降并趋于稳定。在过渡亚带(矿体)及还原亚带与过渡亚带接近位置附近有明显的4 He含量异常显示,然后在过渡亚带基本处于空气中4 He浓度水平。SO_(2)、H_(2)S、CO_(2)、Rn等气体地球化学测量可以用于圈定砂岩型铀矿氧化、还原环境及矿体大致范围,特别是4 He含量能够在地表测量中明显指示砂岩型铀矿化。气体地球化学方法是一种高效追踪矿体分布范围和区域勘查的地表勘查方法。Based on the geochemical survey of SO_(2),H_(2)S,CO_(2),Rn,He gases in the soil of Sunjialiang section of Zaohuohao uranium deposit in the northeast of Ordos basin,the geochemical distribution characteristics and control factors of various gas components in different sub-zones of the oxidation-reduction zone were analyzed,and the possibility of gas geochemistry to delineate the oxidation reduction environment and ore body range of sandstone type uranium deposits were discussed.The background values of H_(2)S,SO_(2),CO_(2) and Rn of soil gases in Sunjialiang section respectively are 0.03×10^(-6),0.049×10^(-6),120.6×10^(-6),2804.4Bq/m^(3),the lower limit of anomaly respectively are 0.078×10^(-6),0.115×10^(-6),3997.5×10^(-6),3670.1Bq∕m^(3).The concentration of CO_(2),H_(2)S,SO_(2) nonradioactive gases gradually increased from the oxidation sub zone to the transition sub-zone,and then decreased and stabilized in the reduction sub zone.There are obvious 4 He content anomalies near the transition sub zone(ore body)and the reduction sub zone and the transition sub zone,and then basically reach the level of 4 He content in the air.Therefore,the geochemical measurement of SO_(2),H_(2)S,CO_(2),Rn and other gases can be used to delineate the oxidation and reduction environment of sandstone type uranium deposits and the general range of ore bodies,especially the 4 He content can clearly indicate sandstone type uranium mineralization in surface measurement.Gas geochemical method was belived an effective surface exploration method to trace the distribution range of ore bodies efficiently.

关 键 词：气体地球化学 砂岩型铀矿 异常分布 勘查方法 

分 类 号：P593[天文地球—地球化学]