| 陈路路.鄂尔多斯盆地纳岭沟地区铀矿物赋存形式研究及其地质意义[J].地质与勘探,2017,53(4):632-642 |
| 鄂尔多斯盆地纳岭沟地区铀矿物赋存形式研究及其地质意义 |
| Occurrence forms of the uranium minerals in the Nalinggou area of the Ordos basin and geological implications |
| 投稿时间：2016-12-29 修订日期：2017-06-14 |
| DOI： |
| 中文关键词: 鄂尔多斯盆地 纳岭沟地区 铀矿物 赋存形式 砂岩型铀矿 |
| 英文关键词: Ordos basin,Nalinggou area,Uranium mineral,Occurrence form,Sandstone-host uranium deposit |
| 基金项目:国家重点基础研究计划973项目（编号2015CB453006）和国家青年自然科学基金（编号41502195）以及中国地质调查项目（编号DD20160127）联合资助 |
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| 中文摘要: |
| 纳岭沟铀矿床位于鄂尔多斯盆地东北部的伊陕单斜构造区，该区含矿主岩为中侏罗统直罗组下段下亚段。通过电子探针、能谱及背散射分析等方法，详细研究了该区目的层砂岩的铀矿物类型及其赋存形式，并对其矿物组合特征及期次等进行了探讨。结果表明纳岭沟地区铀矿物主要为铀石，还有少量的含钛含铀矿物、沥青铀矿、铀钍石等。铀矿物与黄铁矿、蚀变钛铁矿、锐钛矿/白钛石、粘土矿物等密切共生，呈毛刺状或微细柱状产于矿物边缘，或呈粒状产于黑云母解理缝中，另外也见产于碎屑颗粒中。结合电子探针及背散射分析，对蚀变黑云母解理缝中黄铁矿及铀石成因、以及蚀变钛铁矿与铀特殊关系进行了初步探讨。另外该区存在高Y和低Y元素两种铀石类型，沥青铀矿可能为原铀矿物蚀变残留，结合矿物蚀变期次，初步认为该区含铀砂岩至少遭受两期不同成矿流体作用，多源流体耦合成矿可能是砂岩型铀成矿的重要机制之一。 |
| 英文摘要: |
| The Nalinggou uranium deposit is located in the Yishan monoclinal structure area of the northeastern Ordos basin. The upper part of the lower member of the Zhiluo Formation of Middle Jurassic is the metallogenic host rock. Through the analysis of electronic probe, energy spectrum and back scattering, this work studied in detail the uranium mineral types and occurrence forms, and discussed its mineral assemblage characteristics and mineral phases. The results show that the main uranium mineral is coffinite, accompanied with a small amount of titanium-uranium-bearing mineral, pitchblende, and uranothorites. Uranium minerals closely coexist with pyrite, altered ilmenite, anatase or leucoxene, and clay minerals. Some of them occur along the mineral edge with some burrs or fine columns, others are present in biotite cleavage cracks with granulars. Besides some uranium minerals are seen in clastic particles. Combining with the analysis of electronic probe and back scattering, this paper discussed the origin of the pyrite and coffinite in the cleavage joint of biotite, and special relationship of altered ilmenite with uranium. Also there are two kinds of coffinite types which are high Y and low Y elements in this area. Uranium may be an original uranium mineral residual. Combining with the stage of the mineral alteration, it is considered that the uranium-bearing sandstone in this area has received at least two times of actions of ore-forming fluids. Probably multiple fluid coupling mineralization is one of the important mechanisms of sandstone-type uranium. |
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