准噶尔盆地顶山地区乌伦古河组氧化带元素地球化学特征及其与铀矿化的关系

Geochemical characteristics of Wulunguhe Formation oxidation zone and its relation to uranium mineralization in Dingshan area, Junggar basin

主要对准噶尔盆地顶山地区乌伦古河组潜水氧化带和层间氧化带的砂岩进行主量元素、微量元素、稀土元素地球化学特征分析和对比。主微量元素特征显示:潜水氧化带的黏土作用,碳酸盐化作用,U、V、Mo的相关性比层间氧化带强。稀土元素特征显示:层间氧化带与潜水氧化带具统一的物源、沉积环境和构造背景,潜水氧化带轻重稀土分异程度、后生蚀变作用较层间氧化带强,层间氧化带Eu负异常较潜水氧化带明显。

The paper mainly analyzes and compares major elements, phreatie oxidiation zone and interlayer oxidized zone of Wulunguhe Formation in Dingshan area, Junggar basin. Characters of major elements and trace elements indicate that argillation and earbonatization and correlation of U, V and Mo in the phreatic oxidation zone are stronger than those in the interlayer oxidized zone. Conclusion from REE is as follows： there are congruent origins of sedimentation, deposifional setting and tectonic setting. Differentiation of LREE and HREE and alterations in phreatic oxidation zone are more obvious than those in the interlayer oxidized zone. Negative anomaly of Eu in the interlayer oxidized zone is more obvious than that in the phreatic oxidation zone.