地质与勘探2017，Vol.53Issue(4)：632-642,11.
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
摘要
Abstract
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.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Key words
Ordos Basin/Nalinggou area/uranium mineral/occurrence form/sandstone-host uranium deposit分类
天文与地球科学引用本文复制引用
陈路路,刘忠仁,李曙光,冯晓曦,司马献章,李建国,郭虎,陈印,赵华雷,汤超,王贵..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):632-642,11.基金项目
国家重点基础研究计划973项目(编号2015CB453006)、国家青年自然科学基金(编号41502195)和中国地质调查项目(编号DD20160127)联合资助. （编号2015CB453006）
