weight: bold" lang=EN-US>Interaction of Two Fluid Systems in Formation of Sandstone-Type Uranium Deposits in oft-com:office:smarttags" />Ordos Basin: Geochemical Evidence and Hydrodynamic Modelingoft-com:office:office" />

• 责任者：Xue Chunji (State Key Laboratory of Geological Processes and Mineral Resources ; Faculty of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Chi Guoxiang
• 刊名：Mineral Deposits
• 出版年：2010
• 卷期：29(1)
• 关键词：铀矿 ; uranium ores ; 成矿流体 ; ore-forming fluids ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.134-142
• 图表：9 illus., 3 tables, 26 refs.
• 分类号：1001
• issnNo：ISSN0258-7106
• isbnNo：CN11-1965/P

The oft-com:office:smarttags" />Ordos Basin is one of the top oil, gas and coal producers in China and is increasingly recognized as an important uranium mineralization province. Uranium deposits occur near the margin of the basin and are mainly hosted in sandstones of the Jurassic Zhiluo Formation.  The authors hold that the location of uranium mineralization is associated with the mixing of the two fluid flow systems:Uranium was leached from the Cretaceous and Jurassic strata and carried by the descending meteoric fluids, and was reduced from U6+ to U4+ by hydrocarbons carried by the ascending basinal fluids and precipitated at the interface of the two fluid systems. The location of the interface between the two flow systems is dependent on the magnitude of the topographic relief.  oft-com:office:office" />