开鲁盆地宝龙山铀矿物赋存状态研究  

Study on the Occurrence State of Uranium Minerals in the Baolongshan in the Kailu Basin

作　　者：韦承国 聂逢君[1] 宁君[2] 夏菲[1] 张亮亮[2] 严兆彬[1] WEI Chengguo;NIE Fengjun;NING Jun;XIA Fei;ZHANG Liangliang;YAN Zhaobin(East China University of Technology,Nanchang 330013,China;Geologic Team No.243,CNNC,Chifeng 024000,China)

机构地区：[1]东华理工大学,江西南昌330013 [2]核工业二四三大队,内蒙古赤峰024000

出　　处：《河北地质大学学报》2025年第2期1-12,共12页Journal of Hebei Geo University

基　　金：国家自然科学基金项目(U2244205,U2067202)。

摘　　要：宝龙山铀矿床位于开鲁盆地钱家店凹陷东北部,是近年来盆地内发现的大型砂岩型铀矿床之一。通过野外岩芯编录、镜下观察和电子探针等方法,详细研究姚家组砂岩组分、铀矿物类型及赋存状态。研究结果表明,宝龙山铀矿床的铀源主要来自大兴安岭南部蚀源区的富铀岩石。姚家组沉积时发育辫状河沉积相,其砂岩以长石岩屑砂岩和岩屑砂岩为主。通过研究发现,砂岩型铀矿发生铀矿化主要是位于姚家组氧化还原过渡带中的灰白色砂岩。姚家组铀矿物类型主要为沥青铀矿、铀石和钛铀矿,其中主要为沥青铀矿,其次为铀石和钛铀矿。沥青铀矿主要呈团块状、斑点状充填于碎屑颗粒凹坑中,或以胶状形式充填在矿物颗粒间;少量呈网脉状和细粒状赋存于黏土矿物之中。铀石主要呈星点状、不规则粒状或微细脉状赋存于石英、长石等颗粒边缘。钛铀矿主要以不规则团块状或网状赋存在碎屑颗粒内部,是热流体作用的重要标志。自然界中钛铀矿的生成温度较高,一般为300~450℃,也有少量在150~300℃环境下形成,而研究区出现了大量的钛铀矿,且多与二氧化钛及钛铁矿共生,表明研究区经历了热液改造。热流体对研究区砂岩型铀矿成矿过程起到了关键作用。The Baolongshan uranium deposit is located in the northeast of the Qianjiadian depression in the Kailu Basin and is one of the large sandstone type uranium deposits discovered in the basin in recent years.This article conducts a detailed study on the sandstone components,uranium mineral types,and occurrence states of the Yaojia Formation using methods such as field core logging,indoor microscopic observation,and electron probe analysis.The research results indicate that the uranium source of the Baolongshan uranium deposit mainly comes from uranium rich rocks in the southern part of the Daxing'an Mountains.The Yaojia Formation developed braided river sedimentary facies during sedimentation,and its sandstone is mainly composed of feldspar lithic sandstone and lithic sandstone.Through research,it has been found that uranium mineralization in sandstone type uranium deposits mainly occurs in gray white sandstone located in the oxidation-reduction transition zone of the Yaojia Formation.The main types of uranium minerals in the Yaojia Formation are pitchblende,coffinite,and brannerite,with pitchblende being the primary type,followed by coffinite and brannerite.Asphalt uranium ore is mainly filled in the form of clumps and spots in the pits of detrital particles,or in the form of gel between mineral particles.A small amount exists in clay minerals in the form of network veins and fine particles.Coffinite ore mainly exists in the form of star shaped,irregular granular,or fine vein like particles at the edges of quartz,feldspar,and other grains.Brannerite deposits are mainly distributed in irregular clusters or networks within detrital particles,which are important indicators of thermal fluid interactions.The formation of ilmenite in nature is influenced by high environmental temperatures,generally ranging from 300℃to 450℃,with a small amount also formed in environments of 150℃to 300℃.However,a large amount of ilmenite has appeared in the study area,often coexisting with titanium dioxide and ilmenite,indicating t

关 键 词：开鲁盆地 宝龙山铀矿床 沥青铀矿 铀石 钛铀矿 

分 类 号：P5[天文地球—地质学]