伊犁盆地阔斯加尔地区西山窑组上段铀镭平衡系数特征及其地质意义

Characteristics and Geological Significance of Uranium-radium Equilibrium Coefficient in the Upper Xishanyao Formation in Kuosijiaer Area of Yili Basin

为了了解阔斯加尔地区铀矿层中铀元素的迁移和富集特征,为矿床资源量修正提供重要参数,以该地区西山窑组上段铀镭样品为研究对象,开展铀镭平衡系数特征研究,探讨了铀镭平衡系数与样品铀含量、样品粒度、铀矿体不同赋存部位、矿层厚度之间的关系。结果表明,西山窑组上段铀镭平衡系数为0.84,样品铀镭平衡系数介于0.66~1.16,变异系数为15.09%,铀镭呈略微偏铀的正态分布形态。铀镭平衡系数与铀含量和样品粒度呈负相关关系;卷头矿体样品铀镭平衡系数比翼部小。阔斯加尔地区西山窑组上段样品中铀元素的迁移明显,铀成矿作用一直持续至今,矿段中铀元素存在富集叠加现象。

In order to understand the migration and enrichment characteristics of uranium elements in the uranium ore layers of the Kuosijiaer area and provide important parameters for the correction of ore resources, based on the uranium-radium samples from the upper Xishanyao Formation, the characteristics of the uranium-radium equilibrium coefficient of the formation were studied, and the characteristics of the relationship between the uranium-radium equilibrium coefficient and uranium contents of the sample, particle size of the sample, different locations of uranium ore body, and thickness of ore layer were discussed. The results show that the uranium-radium equilibrium coefficient of the upper Xishanyao Formation is 0.84,and the uranium-radium equilibrium coefficient of the sample ranges from 0.66 to 1.16 with the coefficient of variation is 15.09%. Uranium-radium is normally distributed in a slightly uranium-biased form. The uranium radium equilibrium coefficient has a negative correlation with uranium content and sample size. The uranium-radium equilibrium coefficient of the roll-head ore body is smaller than that of the wing. It shows that uranium element migration is obvious in samples of the upper Xishanyao Formation in Kuosijiaer area, and uranium mineralization has continued until modern times. The uranium element enrichment and superposition exist in ore sections.