【作者】 李胜祥； 韩效忠； 蔡煜琦； 郑恩玖； 王保群； 张映宁； 岳淑绢；

【Author】 LI Sheng-xiang;HAN Xiao-zhong;CAI Yu-qi;ZHENG En-jiu;WANG Bao-qun;ZHANG Ying-ning;YUE Shu-juan;Institute of Geology,Beijing Research Institute of Uranium Geology;Geologic Party No.216,CNNC;

【机构】 核工业北京地质研究院地质所； 核工业216大队；

【摘要】 目的本文将伊犁盆地的构造、沉积、古气候演化过程分为基底演化、盖层发育及新构造活动改造等3个阶段,并讨论了3个阶段盆地的构造作用、沉积作用及古气候特征。方法在此基础上,研究了伊犁盆地构造、沉积、古气候演化与砂岩型铀矿成矿关系。结果提出盆地基底多期构造演化,特别是石炭纪裂谷作用的发育是盆地富铀建造形成和后期改造成矿的铀源基础;侏罗纪弱伸展的成盆构造背景发育了有利成矿的沉积体系和沉积相带,造就了良好的储矿空间。结论中侏罗世末期的古气候转变导致的暗灰色建造向红杂色建造转变的沉积演化是砂岩型铀矿成矿的关键;盆地新构造运动控制了盆地砂岩型铀矿的形成。更多还原

【Abstract】 Aim The tectonic,sedimentary and paleoclimatic evolutionary process of the Yili Basin is divided into3 stages,namely,the basement evolution stage,the cover development stage and neotectonic reworking stage,and the tectonic-sedimentary-paleoclimatic evolution features of the basin are discussed.Methods Based on these studies,the relationship between Uranium metallogenesis and the tectonic-sedimentary-paleoclimatic evolution of the Yili Basin is analyzed.Results It is proposed that the multiple evolution of the basement,especially the development of the Carboniferous rifting,provides the Uranium resource basis for the development of uraniferous formation and epigenetic reworking ore-formation;the weakly-extensional tectonic background during Jurassic creates favorable depositional systems and facies as well as good ore-reservoirs for the ore-formation.Conclusion The sedimentary evolution of the change from dark gray formation to variegated formation resulting from the paleoclimatic change at the end of middle Jurassic is the key to the ore-formation of sandstone-type uranium deposits;and the neotectonic movement controls the formation of epigenetic sandstone-type Uranium deposits of the basin.更多还原