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现代地质 ›› 2010, Vol. 24 ›› Issue (4): 785-792.

• 岩石.矿物.矿床 • 上一篇    下一篇

鄂尔多斯盆地东胜砂岩型铀矿中铀矿物的电子显微镜研究

苗爱生1,2  ,陆琦1,3,刘惠芳3  ,肖平3   

  1. 1.中国地质大学 资源学院,湖北 武汉430074;   2.核工业二○八大队,内蒙古 包头014010;
    3.中国地质大学 地质过程与矿产资源国家重点实验室,湖北 武汉430074
  • 出版日期:2010-07-23 发布日期:2010-09-05
  • 通讯作者: 陆琦,男,教授,博士生导师,1942年出生,矿物学专业, 主要从事矿物晶体结构研究工作。
  • 作者简介:苗爱生,男,教授级高级工程师,博士研究生,1967年出生,矿物岩石矿床学专业, 主要从事砂岩型铀矿勘查与研究工作。Email:mash6008@sohu.com。
  • 基金资助:

    国家自然科学基金项目(40772072, 40802023); 国家重点基础研究发展计划项目(2003CB214603)。

Electronic Microscopy Study on the Uranium Minerals of Dongsheng Sandstonetype Uranium Deposit in Ordos Basin

 MIAO  Ai-Sheng1,2 , LIU  Qi1,3, LIU  Hui-Fang3 , XIAO  Ping3    

  1. 1.Faculty of Earth Resources, China University of Geosciences, Wuhan,Hubei430074, China;
    2.No.208 Geologic Party,China Nuclear Geology,CNNC, Baotou, Inner Mongolia014010, China;
    3.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,Wuhan,Hubei430074, China
  • Online:2010-07-23 Published:2010-09-05

摘要:

鄂尔多斯盆地东胜铀矿是我国一个重要的大型砂岩型铀矿床。通过电子显微技术,对该铀矿床中铀矿物的种类、产出特征进行详细的研究。研究确定东胜砂岩型铀矿床中铀矿物主要为铀石和水硅铀矿,两者紧密共生,它们均为表生铀矿物。铀矿物的颗粒十分细小,一般粒度均为微米级。铀石和水硅铀矿往往呈板状、不规则微粒状产出,铀矿物的表面溶蚀现象明显,有的还具纳米级的溶蚀孔。铀矿物的产出与蚀变黑云母、蚀变黄铁矿密切相关,也见到微脉状铀矿物集合体穿切碎屑石英等现象。研究表明在表生作用下,该铀矿床中的铀元素存在溶解(迁移)-沉淀(富集)的反复过程。

关键词: 铀石和水硅铀矿, 东胜砂岩型铀矿, 表生铀矿物; , 电子显微技术, 鄂尔多斯盆地

Abstract:

Dongsheng uranium deposit in Ordos basin is an important large sandstone-type uranium depositBy electronic microscopy, the thesis has made a detailed research on the uranium minerals category and output characteristicsIt has been identified that the main uranium minerals are coffinite and ursilite which are both epigenetic mineralThe diameters of uranium mineral's granule are very tiny, usually at micron (μm) level-Coffinite and ursilite are commonly tabular and irregularly granular, with an obvious phenomenon that is eroded on their surface, and some of them have eroded pore at nanometer (nm) degree; they are closely associated and have a close relationship with biotite and pyrite eroding. It can also be found that micro-vein uranium assemblages penetrate through the quartz clast.It has been researched that the uranium element is dissolved (transferred) and deposited (enriched) repetitively under the epigene.

Key words:  coffinite and ursilite, sandstone-type uranium deposit of Dongsheng, supergene uranium mineral, electronic microscopy, Ordos basin

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