柴达木盆地北缘鱼卡地区砂岩型铀成矿条件及成矿潜力分析  

Condition and Potential of Sandstone-type Uranium Meatallization in Yuqia Area,Northern Qaidam Basin

作　　者：廉康 赵兴齐[2] 王继斌 宋炎 LIAN Kang;ZHAO Xingqi;WANG Jibin;Song Yan(Research Insiiituie No.203,CNNC,Xianyang,Shanxi 712000,China;CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业二〇三研究所,陕西咸阳712000 [2]核工业北京地质研究院,中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《铀矿地质》2020年第3期145-155,共11页Uranium Geology

基　　金：中国铀业有限公司生产中科研项目“柴达木盆地砂岩型铀矿成矿环境分析及远景预测”(编号:201829-2);铀矿区域评价项目“青海柴达木盆地北缘砂岩型铀矿资源调查评价”(编号:201717-1)联合资助。

摘　　要：通过对柴达木盆地北缘鱼卡地区铀源条件、含矿目的层特征、构造演化特征、水文地质条件、古气候特征、后生蚀变特征及铀矿化特征进行系统分析,认为鱼卡地区中侏罗统大煤沟组和石门沟组具备砂岩型铀成矿的基本地质条件,区内铀源丰富,辫状河、三角洲沉积体系发育,泥-砂-泥结构稳定,发育多个背斜、向斜构造及深大断裂,水文地质条件良好,发育潜水氧化带型及层间氧化带型铀矿化,具"两高夹一低"的土壤氡气铀矿找矿指示特征。该区铀成矿主要受铀源、地层岩性结构、构造演化、古气候和后生蚀变等关键因素控制,各种成矿要素匹配良好,具备形成中型以上的砂岩型铀成矿潜力。Based on the systematic analyses of tectonic evolution,uranium source condition,host layer feature,hydrogeology condition,paleo-climate condition,epigenetic alternation and uranium mineralization characteristics in Yuqia area,northern Qaidam Basin,it can be inferred that geological condition of sandstone-type uranium mineralization may develop in Dameigou and Lower Shimengou Formation in Yuqia area.Because There are braided rivers and delta sedimentary systems,stable mudsand-mud structure in the host layer and abundant uranium source.Besides There are favorable hydrogeological conditions which resulted in the phreatic and interlayer oxidation uranium mineralization with the ore prospecting characteristics of"two high and one low"soil radon.Uranium mineralization control factors are well matched and there exists potential of sandstone-type uranium mineralization in Yuqia area.

关 键 词：砂岩型铀矿 成矿环境 控矿因素 成矿潜力 鱼卡地区 柴达木盆地北缘 

分 类 号：P619.14[天文地球—矿床学]