伊犁盆地蒙其古尔铀矿床含矿目的层强高岭石化成因

发布时间：2018-02-21 05:16

本文关键词： 蒙其古尔铀矿床岭石化有机酸性流体烃类包裹体煤成气　出处：《矿物学报》2017年Z1期 　论文类型：期刊论文

【摘要】：蒙其古尔铀矿床品位富、成矿作用复杂等特点在我国现已发现的砂岩型铀矿床中占据着独特的位置。黏土X射线衍射结果显示,蒙其古尔矿床含矿目的层砂体中普遍发育有强烈的高岭石化现象,其高岭石含量占黏土总量的58%~86%。蒙其古尔矿床含矿目的层中有机质及煤系地层中有机质镜质体反射率(Ro)平均值为0.61%,反映该区煤系地层的成熟度整体处于未成熟-低成熟阶段,属于生物生烃阶段。容矿砂岩烃类包裹体的发现证实了目的层本身曾遭受过有机酸性流体的改造。研究认为,沉积成岩过程中有机酸性流体的渗出及成岩期后地表水的渗入叠加改造作用是蒙其古尔矿区含矿目的层砂岩中普遍发育高岭石化的根本原因,煤成气等还原性流体的介入可能与蒙其古尔矿床富大矿体形成关系密切。
[Abstract]:The Mengqiguer uranium deposit occupies a unique position in the sandstone-type uranium deposits now found in China due to its rich grade and complex mineralization. There is a strong kaolinization phenomenon in the sandbodies of the ore-bearing target beds of the Mengqiguer deposit. Its kaolinite content accounts for 58% of the total clay content. The average value of vitrinite reflectance (Roe) in the ore-bearing target bed and coal measure strata of the Mengqi Gur deposit is 0.61-0.61, which indicates that the maturity of the coal-measure strata in this area is at an immature to low maturity stage. The discovery of hydrocarbon inclusions in ore-bearing sandstone confirms that the target layer itself has been modified by organic acidic fluids. The exudation of organic acid fluid in the process of sedimentary diagenesis and the infiltration and superposition of surface water after diagenesis are the fundamental reasons for the widespread development of kaolinization in the sandstone of the ore-bearing target layer in the Mongqiguer mining area. The involvement of reductive fluids such as coal-formed gas may be closely related to the formation of rich ore bodies in the Mengqiguer deposit.
【作者单位】：核工业北京地质研究院;中核集团铀资源勘查与评价技术重点实验室;
【基金】：国家973计划项目(2015CB453004) 中核集团龙腾项目联合资助
【分类号】：P618.13

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