吐鲁番八仙口地区沉积体系及其与铀成矿的关系

通过钻孔岩心编录和测井解释资料的综合统计,以及野外地质露头分析,八仙口地区中下侏罗统含矿目的层可划分出3个沉积体系:辫状三角洲沉积体系、滨浅湖沉积体系和曲流河沉积体系。文章详细论述了各沉积体系的沉积相特征,分析了各沉积体系及沉积相与砂岩型铀矿的成矿关系,指出辫状三角洲沉积体系对砂岩型铀矿成矿最为有利,三角洲前缘、河口坝及分流河道微相是砂岩型铀矿主要的控矿沉积相。

The Depositional System and its Relation to Uranium Mineralization in Baxiankou Area of Turpan,Xinjiang

By the statistics and comprehensive analysis of geologic documentation and well logging data of drill cores and outcrops in Baxiankou area of Turpan,the target uranium exploration layers of Low middle Jurassic was divided into three depositional system:braided river delta system;shallow lacus-trine and swampy system and meandering river system.Characteristic of these systems and their relation to uranium mineralization was discussed in the paper.It was pointed out that the braided river delta dep-ositional system is the best environment to sandstone type uranium mineralization and the main ore con-trolling micro facies are distributary channel and the front delta.