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

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。本文通过电子探针、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...

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Published in地质与勘探 Vol. 53; no. 4; pp. 632 - 642
Main Author 陈路路 冯晓曦 司马献章 李建国 郭虎 陈印 赵华雷 汤超 王贵 刘忠仁 李曙光
Format Journal Article
LanguageChinese
Published 中国地质调查局天津地质调查中心非化石能源矿产实验室,天津 300170%中国地质调查局天津地质调查中心,天津,300170%核工业208大队,内蒙古包头,014010 2017
中国地质调查局天津地质调查中心,天津300170
Subjects
砂岩型铀矿
纳岭沟地区
赋存形式
鄂尔多斯盆地
铀矿物
纳岭沟地区
sandstone-host uranium deposit
Ordos Basin
鄂尔多斯盆地
occurrence form
铀矿物
赋存形式
砂岩型铀矿
Nalinggou area
uranium mineral
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ISSN0495-5331

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Summary: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。本文通过电子探针、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。
Bibliography:11-2043/P
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 metallogenie 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 eoffinite, accompanied with a small amount of titanium - uranium - bearing mineral, pitch- blende, 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 th
ISSN:0495-5331