伊犁盆地南缘蒙其古尔铀矿床含矿砂体与铀成矿的关系

Relationship Between Sandbody and Uranium Mineralization in Mengqiguer Deposit in the Southern Margin of Yili Basin

蒙其古尔铀矿床是伊犁盆地南缘可地浸砂岩型铀矿田的重要组成部分，成因上受多种要素控制。笔者在分析该矿床赋矿砂体规模、厚度的基础上，结合矿体在剖面上的分布形态，研究了砂体与铀成矿的关系，指出在铀成矿过程中，稳定的砂体提供了有利的环境。砂体厚度急剧变薄、泥质夹层增多、砂岩粒度突然由粗变细等沉积微相的变化，对铀的沉淀富集和矿体形成有明显的控制作用。

Based on the analysis on the size and thickness of sand body in Mengqiguer deposit,and the shape of ore body in section,this paper discussed the relationship between sand body and uranium miner-alization,pointed out that in the process of uranium mineralization,the stability of the sand body is a fa-vorable environment;the change of micro faces such as sand body thickness,number of muddy inter-calation layer and grain size significantly affected the precipitation and enrichment of uranium and the for-mation of ore body.