宁东地区铀矿化控制因素分析

Analysis of controlling factors of uranium mineralization in Ningdong

通过研究宁夏东部地区的地质构造、盆地沉积建造、水文地质条件及层间氧化带发育特征表明,地层结构和砂体沉积特征、还原剂、水文地质条件决定着层间氧化带的形成和发育,地质构造对层间氧化带的形成和发育起着控制和改造作用,铀源和层间氧化带发育程度决定了铀矿化的形成和发育规模.提出了直罗组下段下部辫状河道砂体成矿条件最好,其次为延安组底部辫状河道砂体,再次为直罗组下段上部曲流河道砂体.

By studying eastern region of Ningxia geological structure, basin sedimentary formation, hydrogeological condition and development characteristics of interlayer oxidized zone, it indicates that stratigraphic structure and sand sedimentary features, reducing agents, hydrogeological conditions determine the formation and development of interlayer oxidized zone, the geological structure on the formation and development of interlayer oxidized zone plays the role of control and transformation, the development degree of uranium source and interlayer oxidized zone determines formation and development scale of uranium mineralization. It put forward that the best metallogenic location is in sand body of braid shape wadi at lower section of Zhiluo Group bottom, the second location is in sand body of braid shape wadi at the bottom of Yanan Group, the third location is in sand body of braid shape wadi at upper section of Zhiluo Group bottom.