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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。
The features of Mongolian-Uranium deposits are rich in grade and complex in mineralization, occupying a unique position in sandstone-type uranium deposits that have been discovered in our country. The results of clay X-ray diffraction show that the kaolinite phenomenon is generally developed in the ore-bearing sandstone of the Mongolian Gulch deposit. The kaolinite content accounts for 58% ~ 86% of the total clay content. The average reflectance (Ro) of organic matter in the organic matter and coal-bearing strata in the ore-bearing target layer of the Mongolia-Gujur deposit is 0.61%, which indicates that the maturity of the coal measures in this area is in the immature-low maturity stage as a whole, Biological hydrocarbon generation stage. The discovery of hydrocarbon inclusions in ore-bearing sandstones confirmed that the target layer itself had been modified by organic acid fluids. The study suggests that the exudation of organic acid fluid during sedimentary diagenesis and the infiltration and surface modification of sedimentary water after diagenesis are the fundamental reasons for the widespread development of kaolinite in the ore-bearing sandstones in the Mongolian area, and the reduction of coal gas to gas The involvement of sexual fluids may be closely related to the formation of rich orebodies in the Mongucaul deposit.