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明清以来晋水流域之水案与乡村社会 被引量:23
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作者 张俊峰 《中国社会经济史研究》 CSSCI 2003年第2期35-44,共10页
本文以明清以来晋水流域大量水案为线索 ,探讨了国家与地方社会各方力量对乡村水权控制与争夺过程中的互动关系 ,进而提出了晋水流域以水为中心的社会运行模式。
关键词 明清时期 晋水流域 水案 乡村社会 水权控制 社会运行模式
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Hydrodynamic regime as a major control on localization of uranium mineralization in sedimentary basins 被引量:6
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作者 CHI GuoXiang XUE ChunJi 《Science China Earth Sciences》 SCIE EI CAS 2014年第12期2928-2933,共6页
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 e... 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. 展开更多
关键词 uranium deposits LOCALIZATION sedimentary basins hydrodynamic regime fluid overpressure
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