反冲带对褶断带层间氧化带砂岩型铀矿的控制作用研究  

Study on the Control of Recoil Belt of Thrust Nappe Structure for Interlayer Oxidation Zone Sandstone-Type Uranium Deposit

作　　者：李保侠 郭虎科 刘坤鹏 

机构地区：[1]核工业203研究所,陕西咸阳712000 [2]鄂尔多斯市中核石化铀业有限公司,内蒙古鄂尔多斯017000

出　　处：《铀矿地质》2015年第2期89-95,共7页Uranium Geology

基　　金：国家重点基础研究发展计划"973"项目(编号:2003CB21460077)资助成果

摘　　要：宁夏惠安堡地区大地构造背景处于鄂尔多斯盆地西缘褶断带的马家滩褶断带,传统理论认为褶断带不利于后生铀成矿作用。但近几年的找矿探索证明褶断带后生铀成矿既具有典型层间氧化带砂岩型铀矿的一些特点,也有其特殊性。西缘逆冲推覆构造带由逆冲推覆体主体和前缘带组成,前缘带由推覆前缘带和反冲带组成。反冲带多见东倾的叠瓦状反冲断层,最东部反冲断层的上、下盘附近是铀矿化集中的地方。正是这些东倾的叠瓦状分布的反冲断层使找矿目的层反冲上升,接近地表,与含氧地下水发生水力联系,地下水得以对目的层进行更深入、更彻底的改造,形成层间氧化和铀矿化。Regional tectonic setting of Hui’anbao is Majiatan folded fault belt in the western Ordos Basin fold belt. T raditional theory holds that the folded fault belt is not conducive to epigenetic uranium miner‐alization. However ,recent year exploration proved that epigenetic uranium mineralization in folded fault belt has some of the feature of typical interlayer oxidation zone sandstone type uranium deposits ,and al‐so has its own particularity. The western margin thrust belt in Hui’anbao area is composed of the main body and the front belts ,and the front belts include the front and the recoil thrust belts. The recoil thrust belts is often with east dipping imbricate recoil faults. Uranium mineralization concentrates in the hanging and foot wall of the most eastern recoil fault.It is these imprecated east dipping recoil fault that raised and brought the prospecting target strata close to the surface water and exposed to oxygenated ground water.Deeper and thorough reform of ground water to the target strata produced the interlayer oxidida‐tion and uranium mineralization.

关 键 词：层间氧化带 砂岩型铀矿 反冲带 惠安堡地区 

分 类 号：P611[天文地球—矿床学]