松辽盆地南部钱家店凹陷姚家组含水层水成铀矿作用分析  

Analysis on Hydrogenic Uranium Mineralization of Yaojia Formation Aquifer in Qianjiadian Depression of South Songliao Basin

作　　者：禹宝利[1] 张振强 YU Baoli;ZHANG Zhenqiang(Geologic Party No.243,CNNC,Chifeng 024000,China;Research Institute No.240,CNNC,Shenyang 110032,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000 [2]核工业二四○研究所,辽宁沈阳110032

出　　处：《铀矿冶》2022年第4期346-351,共6页Uranium Mining and Metallurgy

基　　金：中国核工业地质局“松辽盆地南部奈曼-大安地区铀矿资源评价与勘查”(201910)。

摘　　要：地浸砂岩型铀矿作为水成铀矿,地下水的参与是成矿的关键。在地质调研和样品分析测试基础上,对钱家店凹陷的地下水成矿作用进行了深入研究。结果表明,姚家组含水层被剥蚀出露,构成直接补给区,其地下水为中性-弱碱性、氧化环境、低矿化度的重碳酸型水;地下水通过剥蚀天窗、断裂排泄;铀以[UO_(2)(CO_(3))_(3)]^(4-)迁移为主,与Ca^(2+)、Na^(+)、Mg^(2+)组成配合物迁移进入姚家组含水层;从补给区至径流区(氧化还原过渡带),地下水矿化度、铀含量大幅增高,溶解氧降低;预示后生氧化成矿作用的发生。铀成矿作用包括沉积期铀预富集、埋藏期铀成矿、隆升剥蚀期铀叠加成矿3个阶段。As hydrogenic uranium deposit,The participation of groundwater is crucial to mineralization of in-situ leaching sandstone type uranium deposit.On the bases of geological investigation and sample testing,the groundwater uranium mineralization in Qianjiadian depression has been studied.The results show that aquifer in Yaojia Formation is exposed by erosion and constitute direct supply areas.The groundwater in supply areas is neutral to alkalescent,oxidation environment,bicarbonate with low salinity.The groundwater is discharged by denudation sky-windows and faults.Uranium migrate mainly in the form of[UO_(2)(CO_(3))_(3)]^(4-),forms complex with Ca^(2+),Na^(+),Mg^(2+)and enters into aquifer of Yaojia Formation.From supply areas to run-off areas,salinity,uranium content increase sharply,but dissolved oxygen decrease,and these reveal epigenetic oxidation happens.Uranium mineralization process includes uranium pre-concentration in depositional stage,uranium mineralization in burial stage and uranium superimposed reformation in uplifting-denudation stage.

关 键 词：钱家店凹陷 姚家组含水层 地下水 铀成矿作用 

分 类 号：P619.14[天文地球—矿床学]