| 尼日尔特吉达地区砂岩中铀的热流体成矿作用 |
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| 关键词:sandstone uranium hydrothermal fluids Teguida Niger |
| 基金项目:国家自然科学基金项目(编号: 40972067) |
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| 摘要: |
| Hydrothermal Mineralization of Uranium in Sandstone, Teguida, Niger |
| Based on geological survey, core observation and documentation, the authors have found that the uranium mineralization related to hydrothermal fluids in the Teguida ore deposit of Niger is genetically quite different from previous researchers’ assumption. The target layer sandstones for mineralization were deposited from the lacustrine beach or shallow lake. Sandstones assume conglomeratic characteristics and are well sorted and rounded, with upward coarsening sequence and wash cross-bedding. Electron microprobe analyses show that uranium min-erals mainly occur as pitchblende, coffinite and absorption and are granular, tiny veinlike and disseminated in form, associated with copper mineralization. Calcitization, analcitization and sericitization in the mineralized sandstone are closely related to uranium. The diagenetic siderite was altered into hematite and goethite during later oxidation. According to the dolomite molecular numbers in cogenetic calcite, the carbonate mineral temperature should range from 178℃ to 385℃, averaging 251-300℃. |
| NIE Feng-jun,LIN Shuang-xing,YAN Zhao-bin,RAO Ming-hui,YANG Yong-ji,ZHANG Cheng-yong,YAN Yong-jie.2010.Hydrothermal Mineralization of Uranium in Sandstone, Teguida, Niger[J].Acta Geoscientica Sinica,31(6):819-831. |
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