伊犁盆地南缘铀成矿与水文地质条件研究

Study on Uranium Metallogenic Potential and Hydro-geological Condition in Southern Yili Basin

在分析伊犁盆地区域地质及水文地质条件及铀矿形成物质来源的基础上,结合盆地地形、沉积环境、水系的补给、径流、排泄条件、层间氧化带砂岩型铀矿床成矿地质规律,分析总结出伊犁盆地南缘砂岩型铀矿成矿与水文地质条件关系。伊犁盆地周边存在长期稳定的蚀源区,源区内存在富铀地质体,源区形成的溪流在流出山区之前汇入较大的沟谷;并沿规模较大的沟谷流出山区,流经出露有深部倾斜砂岩地层的盆缘。同时,由于砂岩的渗透性大,地下水交替强烈,还原容量大,这些水文地质条件共同成为伊南砂岩型铀矿形成的决定性因素。

On the basis of analyzing of regional geology,hydro-geological conditions and uranium ore formation,at the same time,combined basin topography,sedimentary environment,water supply,runoff and discharge conditions,the geological deposits laws of sandstone-type uranium mineralization in the interlayer oxidation zone,this research have analyzed and summarized the conditional relations of hydro-geological in forming of sandstone-type uranium deposits at southern margin of Yili basin. Long-term stability of the source region exist surrounding of Yili basin,there are a uranium-rich geological in source region. The streams that formed in source region importing into a large valley before flowing out mountain. Then it flows through the basin margin which are titled deep tilt sandstone formation. Meanwhile,as a result of the powerful permeability of sandstone,the drastic alternately of groundwater and the large capacity of reduction are prosented. All of these hydro-geological conditions act as decisive factor in forming of sandstone-type uranium deposits at southern of Yili basin.