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鄂尔多斯盆地皂火壕-纳岭沟地区铀矿含矿砂体矿物特征与成矿机理探讨

刘正义, 李西得, 赵兴齐, 蔡亚, 王明太, 惠小朝, 张斌, 赵永安

刘正义, 李西得, 赵兴齐, 等. 鄂尔多斯盆地皂火壕-纳岭沟地区铀矿含矿砂体矿物特征与成矿机理探讨[J]. 西北地质, 2017, 50(2): 191-206.
引用本文: 刘正义, 李西得, 赵兴齐, 等. 鄂尔多斯盆地皂火壕-纳岭沟地区铀矿含矿砂体矿物特征与成矿机理探讨[J]. 西北地质, 2017, 50(2): 191-206.
LIU Zhengyi, LI Xide, ZHAO Xingqi, et al. Discussion on Metallogenic Mechanism and Mineral Characteristics of Ore-bearing Sandstone from the Zaohuohao-Nalinggou Uranium Deposit in Ordos Basin[J]. Northwestern Geology, 2017, 50(2): 191-206.
Citation: LIU Zhengyi, LI Xide, ZHAO Xingqi, et al. Discussion on Metallogenic Mechanism and Mineral Characteristics of Ore-bearing Sandstone from the Zaohuohao-Nalinggou Uranium Deposit in Ordos Basin[J]. Northwestern Geology, 2017, 50(2): 191-206.

鄂尔多斯盆地皂火壕-纳岭沟地区铀矿含矿砂体矿物特征与成矿机理探讨

基金项目: 

中国核工业地质局“二连盆地川井坳陷西段铀矿资源远景调查”(12120115018301)和“柴达木盆地北缘铀成矿地质特征与远景评价”(201587)联合资助

详细信息
    作者简介:

    刘正义(1936-),男,研究员级高工,主要从事铀矿床和实验地球化学研究工作。E-mail:zhaoxingqi_77@126.com

  • 中图分类号: P619.14

Discussion on Metallogenic Mechanism and Mineral Characteristics of Ore-bearing Sandstone from the Zaohuohao-Nalinggou Uranium Deposit in Ordos Basin

  • 摘要: 利用皂火壕-纳岭沟地区111个全岩和矿物扫描电子显微镜、部分全岩和矿物衍射分析的形态、形貌特征以及常量元素等化学分析结果,结合成因矿物学与找矿矿物学理论,分析了研究区直罗组下亚段铀矿化岩石与围岩的物性、黏土矿物及铀矿物形态形貌、黏土矿物的分量及其成矿溶液酸碱度识别等特征。研究结果表明,延安组顶部地层存在长期沉积间断以及古气候演化对该区铀成矿具有积极意义,同生沉积成岩成矿预富集为该区铀成矿富集奠定了坚实的基础;铀在碳酸盐溶液从U+6还原成U+4过程中,要在还原性更强的电位值条件下进行;钙质砂岩在该区铀成矿中扮演成矿溶液通道的角色,矿化砂岩、灰色砂岩、绿色砂岩、灰绿色砂岩形成于不同的沉积环境中,氧化-还原过渡带是该区砂岩型铀矿找矿主要部位。
    Abstract: In Zaohuohao-Nalinggou area, based on the SEM (scanning electron microscope) test results of total rock and minerals for all 111 samples, XRD (X ray diffraction) and macro elements test for some samples, with the combination of knowledge of genetic mineralogy and prospecting mineralogy, the physical property, shape of clay mineral and uranium mineral, clay minerals component and pH of mineralized solution for mineralized rock and wall rock from the Lower Sub-Section of Zhiluo Formation have been analyzed.The results show that the paleo-climate variation and long-term depositional break existed in the upper Yan'an Formation have active significance for the uranium mineralization in this area, and the diagenesis and mineralization of different rock in syn-depositional stage are all favorable to uranium enrichment.In carbonate solution, reaction from U+6 to U+4 must occurs in strong reducing environment.Calcareous sandstone can be regarded as the migration pathway of mineralized solution for uranium mineralization.Mineralized sandstone, gray sandstone, green sandstone and celadon sandstone were all formed in different depositional environment.Redox transitional zone may be the most favorable place for uranium prospecting.
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出版历程
  • 收稿日期:  2016-09-04
  • 修回日期:  2017-03-14
  • 网络出版日期:  2022-07-28
  • 发布日期:  2017-06-04

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