| 鄂尔多斯盆地南部店头地区直罗组砂岩成岩演化与铀成矿 |
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| 引用本文：邢秀娟,柳益群,李卫宏,龚斌利.2008.鄂尔多斯盆地南部店头地区直罗组砂岩成岩演化与铀成矿[J].地球学报,29(2):179-188. |
| DOI：10.3975/cagsb.2008.02.08 |
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| 基金项目:国家重点基础研究发展计划“973”项目(编号:2003CB214603) |
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| 中文摘要:通过鄂尔多斯盆地南部店头地区含矿砂岩的普通薄片观察、薄片染色、阴极发光、扫描电镜及能谱分析、电子探针、全岩及粘土矿物X衍射、流体包裹体等分析，对研究区直罗组含矿砂岩成岩作用进行了较全面的研究，探讨了成岩演化与铀成矿的关系。研究认为，直罗组砂岩成岩环境经历了由酸性到碱性再到酸性、由同生期氧化→浅埋期弱还原→短暂抬升期弱氧化→深埋期还原增强→大幅度抬升期氧化还原过渡的演化过程，该过程控制着铀离子的迁移、聚集以及最终的定位。该砂岩型铀矿形成于盆地埋藏成岩作用晚期（相当于表生作用阶段）相对埋藏较浅的氧化一还原过渡带。 |
| 中文关键词:成岩演化 砂岩型铀矿 店头地区 鄂尔多斯盆地 |
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| Sandstone Diagenesis and Uranium Mineralization of the Zhiluo Formation in the Diantou Area, Southern Ordos Basin |
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| Abstract:The Diantou sandstone-type uranium deposit is another important deposit in Ordos basin besides the Dongsheng uranium deposit. By such means as general slice, slice staining, cathodoluminescence, SEM and energy spectrum, electron microprobe, whole rock and clay mineral X-diffraction and fluid inclusions analysis, the authors conducted a comprehensive analysis of the diagenesis of mineral-bearing sandstone of Zhiluo Formation and on such a basis discussed the relationship between diagenetic evolution and uranium mineralization. The results show that Zhiluo Formation sandstone underwent acid→alkalic→acid diagenetic environment and syngenetic oxidation→feeble-reduction in the shallow burial period→feeble oxidation in the transitory elevation period→reduction enhancing in the deep burial period→oxidation/ reduction in the period of large-scale evolutionary process, which controlled the migration, accumulation and localization of uranium ions ultimately. The sandstone-type uranium deposit was generated at the oxidation/reduction zone of shallow bury in the late period of burial diagenesis (equivalent to epigenesis). |
| keywords:diagenetic evolution sandstone-type uranium deposit Diantou area Ordos basin |
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