Study on sandstone type uranium deposit has been more concerned problem in recent years.Based on research on sandstone-type uranium deposit of Yili basin,most of the uranium has been found in the southwestern margin of Yili Basin,whereas it is not optimistic for the exploration results in the southeastern margin of Yili Basin.This study concerns on Shuixigou group of Suasu river outcrop in the southern margin of Yili Basin.Based on field investigation,section description,rapid radioactive measurement,systematic sampling,drilling data statistics and laboratory analysis,and other studying characteristics,size,direction of interlayer oxidation zone petrology and uranium source conditions,considered that the interlayer oxidation zone in outcrop area is obvious and it's made up of oxidation zone,transition zone and reduction zone.The rock type of oxidation zones is general red and yellow sandstone.Almost all feldspar are alteration,sericitization and clayization.Mica hydrolysis and generating limonite;The transition zones mainly consist of gray sandstone,interbedded with red and yellow sandstone.Partly feldspar are alteration;The reduction zone is made up of gray sandstone,which feldspar and the mineral alteration hardly occur.Field test result shows that intensity of radioactivity of transition zone is the highest,secondly the reduction zone and the oxidation zone is the weakest.In conclusion,there are good uranium source rocks in the southeastern margin of Yili Basin,the outcrop towards the basin which is localized in part of oxidation sandstone body annihilated could be the favorable uranium mineralization area in combination with regional mountain-basin coupling relations and regional groundwater recharge system.%以伊犁盆地南缘东段苏阿苏河露头区水西沟群为研究对象,通过野外调查、实测剖面、快速放射性测量、系统取样、钻井资料统计和室内分析等,对层间氧化带岩石学特征、展布方向和规模及铀源岩条件分析认为,露头区层间氧化分带现象明显,由氧化带、过渡带和还原带组成.氧化带一般为红色与黄色砂砾岩,多数长石发生蚀变,云母水解伴有褐铁矿化;过渡带为灰色夹红色和黄色砂砾岩,长石发生部分蚀变;还原带为灰色砂砾岩,长石云母等矿物一般不发生蚀变.野外测量指示,放射性强度由高到低为过渡带、还原带和氧化带.伊犁盆地南缘东段具良好的铀源岩和铀储层,结合区域盆山耦合关系、氧化砂体展布及区域地下水补给系统分析认为,铀成矿有利区域主要分布在露头区向盆地方向,氧化砂体尖灭部位.
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