Hydrodynamic regime as a major control on localization of uranium mineralization in sedimentary basins

查看全文 作　　者：CHI [1]GuoXiang;XUE [2]ChunJi

机构地区：[1]Department of Geology, University of Regina;[2]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences

出　　处：《Science China Earth Sciences》索引2014年第57卷第12期,共6页

基　　金：supported by Natural Sciences and Engineering Research Council of Canada(NSERC-Discovery Grant);the National Natural Science Foundation of China(Grant No.41072069) 摘　　要：Uranium deposits in sedimentary basins can be formed at various depths,from near surface to the basement.While many factors may have played a role in controlling the location of mineralization,examination of various examples in the world,coupled with numerical modeling of fluid flow,indicates that the hydrodynamic regime of a basin may have exerted a major control on the localization of uranium deposits.If a basin is strongly overpressured,due to rapid sedimentation,abundance of low-permeability sediments or generation of hydrocarbons,fluid flow is dominantly upward and uranium mineralization is likely limited at shallow depths.If a basin is moderately overpressured,upward moving fluids carrying reducing agents may meet downward moving,oxidizing,uranium-bearing fluids in the middle of the basin,forming uranium deposits at moderate depths.If a basin is weakly or not overpressured,either due to slow sedimentation or dominance of high-permeability lithologies,minor topographic disturbance or density variation may drive oxidizing fluids to the bottom of the basin,leaching uranium either from the basin or the basement,forming unconformity-type uranium deposits.It is therefore important to analyze the hydrodynamic regime of a basin in order to predict the most likely type and location of uranium deposits in the basin. 关键词：沉积盆地铀矿化水动力本地化控制政权流体流动碳氢化合物

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Hydrodynamic regime as a major control on localization of uranium mineralization in sedimentary basins

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