二连盆地中部古河谷砂岩型铀矿成矿特征及潜力分析  

Mineralization Characteristics and Potential of Paleo-valley Type Uranium Deposit in Central Erlian Basin,Inner Mongolia

作　　者：康世虎[1,2] 杨建新[2] 刘武生[3] 赵兴齐[3] 乔鹏[2] 杜鹏飞[2] 吕永华[2] 

机构地区：[1]中国地质大学(武汉),湖北武汉430074 [2]核工业208大队,内蒙古包头014010 [3]核工业北京地质研究院,北京100029

出　　处：《铀矿地质》2017年第4期206-214,共9页Uranium Geology

基　　金：核工业地勘基金"内蒙古二连浩特市哈达图铀矿床普查"项目(编号:201602-2)和"二连盆地深部层位铀成矿关键地质问题研究与靶区优选"项目(编号:DZB162-1)联合资助

摘　　要：二连盆地早白垩世末期断拗转换的构造应力场背景,为赛汉组上段古河谷沉积的发育创造了有利的地质条件。赛汉组上段古河谷沉积是在下段辫状河三角洲沉积的基础上演化而成,由于湖泊沉积衰亡,形成了长流程的古河道砂体,为铀成矿提供了理想的赋矿空间。晚白垩世-古新世长时间的沉积间断,有利于氧化带的发育。因此,古河谷砂体和氧化带控制了盆地内的铀成矿。笔者通过以哈达图、赛汉高毕和巴彦乌拉铀矿床的对比分析,建立了二连盆地3种不同古河谷类型的铀成矿模式,并对其进行了潜力分析,指出找矿的方向。The tectonic transformation from fault to depression in Erlian basin at the end of early Creta- ceous provided favorable condition for the evolution of paleo-valley in the upper member of Saihan forma- tion on the base of braided river delta of the lower member of Saihan formation. Due to the declination of lacustrine sedimentation, long-path paleo-valley sandstone was formed, which provided favorable ore space for uranium mineralization. Long time hiatus between late Cretaceous and Paleocene favored the de- velopment of oxidation and controlled the formation of sandstone and uranium mineralization. On the basis of comparative analysis of Hadatu, Saihangaobi and Bayanwula uranium deposits, three types of pa- leo-valley uranium mineralization models in Erlian basin were established and the mineralization potential and prospecting direction were also discussed .

关 键 词：二连盆地 古河谷 铀成矿特征 潜力评价 

分 类 号：P612[天文地球—矿床学]