鄂尔多斯盆地纳岭沟铀矿床岩石学、矿物学特征及其对铀成矿作用的指示意义
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本文为核工业地质局铀矿地质科研项目“鄂尔多斯盆地西北部砂岩型铀矿成矿作用与新区突破研究”(编号:地D1911)、国家重点基础研究发展计划(“973”计划)(编号:2015CB453004)和中核集团集中研发项目(龙腾二期)下设专题 “鄂尔多斯盆地北部砂岩型铀矿关键因素识别与靶区优选”(编号:地LTD1601- 2)的成果。


Petrological and mineralogical characteristics of Nalinggou uranium deposit in Ordos Basin and its indicative significance for uranium mineralization
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    摘要:

    对砂岩型铀矿床各地球化学分带中砂岩的岩石学、矿物学特征进行对比分析,对于探索铀成矿过程具有重要意义。前人对纳岭沟铀矿床砂岩的矿物学特征做了一定的研究,但是对铀成矿过程中各伴生矿物之间的相关关系及其地质意义的认识相对薄弱。本文通过对鄂尔多斯盆地北东部纳岭沟铀矿床不同地球化学分带中砂岩进行岩相学分析、X衍射分析以及碳酸盐C—O同位素分析,建立了各矿物之间的相关关系,根据矿物之间的相关关系来反演成矿过程中目的层砂岩地球化学环境变化的过程。镜下鉴定结果表明纳岭沟铀矿床砂岩主要为长石岩屑砂岩;全岩碳酸盐胶结物的碳同位素组成范围为-20. 6‰~-3. 8‰,根据碳酸盐胶结物的氧同位素反演的碳酸盐胶结物形成时期的流体为大气降水和海水,表明碳酸盐胶结物的形成与有机质、大气降水中以及深部海相碳酸盐的溶解有关;矿物之间的相关关系表明在成矿过程中目的层砂岩经历了三个阶段的地球化学环境的变化:层间氧化过程中的酸性氧化环境阶段、氧化还原过渡带的碱性弱还原环境阶段以及晚期的碱性强还原环境阶段。本文的研究对深入认识铀成矿过程中地球化学环境的变化具有重要的意义。

    Abstract:

    Objectives: The comparative analysis of petrological and mineralogical characteristics of sandstone in different geochemical zones of sandstone- type uranium deposits is of great significance for exploration of uranium mineralization. Although previous studies on mineralogical characteristics of the minerals in the Nalinggou uranium deposit have been done, the correlation and geological significance of the associated minerals in the uranium mineralization process are relatively weak. Methods: In this paper, petrographic analysis, X- ray diffraction analysis and carbonate C—O isotope analysis of sandstone in different geochemical zones of Nalinggou uranium deposit are carried out to establish the correlation between the different minerals, and to inverse the geochemical environment changes of the target layer of sandstone in the mineralization process according to the correlation between the minerals. Results:The microscopic identification results show that the sandstone in Nalinggou uranium deposit are mainly feldspar lithic sandstone; the carbon isotopic composition of the whole- rock carbonate cements range from -20.6‰ to -3.8‰. The fluid during the formation period of carbonate cement based on the oxygen isotope which is inversed by the oxygen isotope of carbonate cement is meteoric water and ocean water, which indicates that the formation of carbonate cement is related to the dissolution of organic matter, atmospheric precipitation and deep marine carbonate. Conclusions:The relationship between different mineral shows that the sandstone has experienced three stages of the changing process of the geochemical environment during the process of ore- forming: alkaline acid oxidation environment in early stage, weak reduction environment stage in medium stage and late stage of alkaline strong reducing environment. The research in this paper is of great significance to the further understanding of the change of geochemical environment during uranium mineralization.

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张宾,刘红旭,丁波,易超,张艳.2020.鄂尔多斯盆地纳岭沟铀矿床岩石学、矿物学特征及其对铀成矿作用的指示意义[J].地质论评,66(2):410-424,[DOI].
ZHANG Bin, LIU Hongxu, DING Bo, YI Chao, ZHANG Yan.2020. Petrological and mineralogical characteristics of Nalinggou uranium deposit in Ordos Basin and its indicative significance for uranium mineralization[J]. Geological Review,66(2):410-424.

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  • 收稿日期:2019-10-12
  • 最后修改日期:2020-01-19
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  • 在线发布日期: 2020-03-16
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