鄂尔多斯惠安堡逆冲断褶带式砂岩型铀矿矿化特征及成矿模式
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摘要
典型层间氧化带砂岩型铀矿产出于次造山带构造背景,且具有缓倾斜坡带的中新生代盆地。惠安堡地区大地构造背景处于鄂尔多斯盆地西缘褶断带马家滩断褶带。经典的水成铀矿理论和评价准则认为断褶带不利于后生铀成矿作用,但近几年的找矿探索证明断褶带后生铀成矿既有典型层间氧化带砂岩型铀矿的一些特点,也有自己的特殊性。鄂尔多斯盆地西缘推覆构造带中的反冲带多见东倾的反冲断层,最东部反冲断层的上、下盘是铀矿化集中的地方。正是这些反冲断层使找矿目的层上升,接近地表与含氧含铀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。在综合分析该区砂岩型铀矿矿化特征的基础上,提出了鄂尔多斯盆地西缘"逆冲断褶带式"砂岩铀矿成矿模式。
Typical interlayer oxidation zone sandstone-type uranium mineral occurs in the Meso-Cenozoic basin which has the tectonic background of time-orogenic belts and inclined slope belts. Hui'anbu is at Majiatan faultfold belt of the western margin of Ordos basin. The classic theory and evaluation criteria of hydrogenic uranium deposit considers that fault-fold belt is not conducive to epigenetic uranium mineralization,but in recent years prospecting exploration prove that the fault-fold belt epigenetic uranium mineralization not only has the characteristic of typical interlayer oxidation zone sandstone-type uranium deposits,but also has its own particularity. Recoil belts of western margin of the Ordos basin are mostly east-dipping recoil faults. Uranium mineralization is concentrated at hanging and lower walls of the most eastern recoil fault. It is these recoil faults the prospecting target layer rise,close to the surface and contact with groundwater containing oxygen and uranium,the objective layer can be reformed by groundwater more deeply,more thoroughly. So the interlayer oxidation and uranium mineralization can be formed. Based on comprehensive analysis of the sandstone type uranium mineralization,this paper puts forward the " thrust fault fold belt type" metallogenic model of the sandstone uranium deposit in the western margin of Ordos basin.
Typical interlayer oxidation zone sandstone-type uranium mineral occurs in the Meso-Cenozoic basin which has the tectonic background of time-orogenic belts and inclined slope belts. Hui'anbu is at Majiatan faultfold belt of the western margin of Ordos basin. The classic theory and evaluation criteria of hydrogenic uranium deposit considers that fault-fold belt is not conducive to epigenetic uranium mineralization,but in recent years prospecting exploration prove that the fault-fold belt epigenetic uranium mineralization not only has the characteristic of typical interlayer oxidation zone sandstone-type uranium deposits,but also has its own particularity. Recoil belts of western margin of the Ordos basin are mostly east-dipping recoil faults. Uranium mineralization is concentrated at hanging and lower walls of the most eastern recoil fault. It is these recoil faults the prospecting target layer rise,close to the surface and contact with groundwater containing oxygen and uranium,the objective layer can be reformed by groundwater more deeply,more thoroughly. So the interlayer oxidation and uranium mineralization can be formed. Based on comprehensive analysis of the sandstone type uranium mineralization,this paper puts forward the " thrust fault fold belt type" metallogenic model of the sandstone uranium deposit in the western margin of Ordos basin.
引文
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李保侠,贾恒,于宏伟,等.2010.鄂尔多斯盆地西缘惠安堡地区铀成矿特点[J].铀矿地质,26(4):201-207.
刘杰,聂逢君,侯树仁,等.2013.中新生代盆地试论砂岩型铀矿床铀矿物类型及赋存状态[J].东华理工大学学报:自然科学版,36(2):107-112.
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