| 内蒙古西胡里吐盆地有机质特征及其与铀矿化的关系 |
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| 引用本文： | 郭庆银,李子颖,王文广.内蒙古西胡里吐盆地有机质特征及其与铀矿化的关系[J].铀矿地质,2005,21(1):16-22. |
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| 作者姓名： | 郭庆银 李子颖 王文广 |
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| 作者单位： | 核工业北京地质研究院,北京,100029 |
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| 摘 要： | 在砂岩型铀矿床中 ,有机质与铀矿化之间有着较为密切的关系。西胡里吐盆地的有机质主要是以松柏类和蕨类等高等植物残体为母质的腐殖型有机质。通过镜质体反射率、有机质碎屑的颜色、粘土矿物X 衍射和古地温恢复等分析测试发现 ,有机质的成熟度较低 ,处于未成熟—低成熟早期阶段。有机质的类型和成熟度决定了其在热演化中产生了大量腐殖酸并保存在地层中。褐煤、腐殖酸、残余植物碎屑和地沥青等是现存有机质的主要类型。除大量产出的煤层外 ,有机质主要呈碎屑状和细分散状分布于地层之中。 70 %的岩石中有机质的丰度在 0 1 %～ 3 % ,对铀矿化的形成较为有利。铀与有机质的紧密共生以及二者之间的正相关性 ,表明了有机质在西胡里吐盆地铀矿化形成中所起的重要作用。有机质中的腐殖酸与铀矿化的关系最为密切 ,有机粘土复合体、蚀变岩屑、植物碎屑和地沥青等吸附剂对铀的吸附均与腐殖酸有关。腐殖酸吸附铀后可以将铀还原 ,还可以与铀酰离子等进行络 (鳌 )合形成铀酰腐殖酸盐 ,并最终引起铀的沉淀富集。
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| 关 键 词： | 西胡里吐盆地 有机质特征 铀矿化 腐殖酸 |
| 文章编号： | 1000-0658(2005)01-0016-07 |
| 修稿时间： | 2004年7月2日 |
Features of organic substances and their relationship to uranium mineralization in Xihulitu basin, Inner Mongolia |
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| GUO Qing-yin,LI Zi-ying,WANG Wen-guang.Features of organic substances and their relationship to uranium mineralization in Xihulitu basin, Inner Mongolia[J].Uranium Geology,2005,21(1):16-22. |
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| Authors: | GUO Qing-yin LI Zi-ying WANG Wen-guang |
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| Abstract: | Uranium is intimately associated with organic substances at many sandstone-type uranium deposits.Organic substances in Xihuliu basin are of humic type derived from advanced plants such as coniferals and ferns.Reflectance of vitrinite analysis,color of organic debris,X-ray diffraction analysis of clay minerals and geothermal reconstruction show the low maturity of organic substances being at the unmatured to low-matured early stage.The type and the maturity resulted in the generation of large amount of humic acid during thermal evolution that could be preserved in strata.Lignitous coal,humic acid,fragments of plant remnants and asphalt are main forms of existing organic substances.Besides those coal beds,organic substances are distributed mostly in detrital and disperse states in strata.The abundance of organic substances in most(70%)sandstones ranges from 0.1% to 3%,which is favorable for the formation of uranium mineralization.The close association and positive correlation between uranium and organic substances perform important functions of organic substances in uranium ore-formation.The humic acid in organic substances plays the most important role in uranium ore-formation,because the adsorbents in organic clay,in the altered rock debris,in plant fragments and in asphalt are of humic nature.Having been adsorbed,the uranium could be reduced by humic acid,or uranyl cations can be in complexation with organic substances to form uranyl humates resulting in the precipitation and concentration of uranium. |
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| Keywords: | Xihulitu basin organic substance uranium mineralization humic acid |
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