伊犁盆地含砂岩铀矿地层中稀土元素的富集研究  

Study on the Enrichment of Rare Earth Elements in the Stratum Containing Sandstone Uranium Deposits in the Yili Basin

作　　者：赵利信 ZHAO Lixin(China Nuclear Mining Science and Technology Corporation,Beijing 101149,China)

机构地区：[1]中核矿业科技集团有限公司,北京101149

出　　处：《中国资源综合利用》2024年第7期125-129,共5页China Resources Comprehensive Utilization

基　　金：国家自然科学基金项目(U2167212和41902181)。

摘　　要：伊犁盆地位于新疆维吾尔自治区西部,地处西天山构造带,属于山间叠合盆地,矿产资源丰富。侏罗系水西沟群第Ⅴ旋回发育于伊犁盆地砂岩铀矿内,稀土元素在炭质砂岩及煤层中高度富集。经测定,煤层底板砂岩样品的稀土元素含量最高值达1589.0μg/g,煤样的稀土元素含量最高值达430.3μg/g。稀土元素配分模式以右倾的轻稀土富集型为主,呈现Eu的负异常。煤样中,稀土元素含量与铀含量呈正相关,稀土矿物以磷钇矿、水磷铈石和磷铝铈矿为主。研究表明,稀土元素源自盆地周边酸性岩风化蚀变作用,酸性岩释放的稀土元素和铀元素随着地下水流动,共同沉淀在有机质富集层位中。The Yili Basin is located in the western part of Xinjiang Uygur Autonomous Region,in the west Tianshan tectonic belt,which belongs to the intermountain superimposed basin and is rich in mineral resources.The cycleⅤof the Jurassic Shuixigou Group is developed in sandstone uranium deposits in the Yili Basin,with high enrichment of rare earth elements in carbonaceous sandstone and coal seams.After measurement,the highest rare earth element content in the sandstone sample of the coal seam floor is 1589.0μg/g,and the highest rare earth element content in the coal sample is 430.3μg/g.The rare earth element distribution pattern is mainly characterized by a right skewed light rare earth enrichment type,showing a negative anomaly of Eu.In coal samples,the content of rare earth elements is positively correlated with uranium content,and rare earth minerals are mainly composed of yttrium phosphate ore,hydrous cerium phosphate,and aluminum phosphate cerium ore.Research has shown that rare earth elements originate from the weathering and alteration of acidic rocks around the basin,the rare earth elements and uranium elements released by acidic rocks flow together with groundwater and precipitate in organic matter enriched layers.

关 键 词：稀土元素 富集 砂岩铀矿 酸性岩 伊犁盆地 

分 类 号：P619.14[天文地球—矿床学]