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Mineralogy,Fluid Inclusion and H-O-C-S Stable Isotopes of mengqiguer uranium deposit in the Southern Yili Basin,Xinjiang:Implication for Ore Formation

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1488-1503页

作者： DING Bo LIU Hongxu ZHANG Chuang LIU Hongjun LI Ping ZHANG Bin CNNC Key Laboratory of uranium Resources Exploration and Evaluation Techniques Beijing Research Institute of Uranium GeologyBeijing 100029China China Institute of Nuclear Information and Economics Beijing 100048China

The mengqiguer deposit in the southern Yili basin Ili Basin is a large interlayer-oxidation-zone type uranium *** this paper,we applied multiple methods including microscopic observation,scanning electron microscope and electronic probe,to analyze the systematical alteration characteristics of the ore-bearing sandstone *** inclusion and stable isotope studies on the ore-bearing sandstone have also been carried out to discuss the internal relations between fluid activities,epigenetic alteration and the uranium *** epigenetic alteration include clay alteration,carbonatization and pyritization,of which biogenetic pyritization is most closely related to the uranium *** suggests the existence of microorganism during the uranium mineralization *** mineralization fluids of low temperature,medium density but varied salinities are suggested to be derived from multi-source,including the meteoric water and organic acidic vapor components from coal-bearing *** mineralization,grain-dispersed kaolinite,limonite,colloidal pyrite,and the carbonate cements associated with sulfate-reducing bacteria were formed by meteoric water and vermicular-shaped kaolinite,autologous pyrite,and the carbonate cementation associated with the dehydroxylation of organic matter was formed by organic *** on these results,we consider that the uranium mineralization and epigenetic alteration both resulted from the reciprocity of organic–inorganic fluid and fluid–rock during the formation of the interlayer oxidation zone.

关键词： Metallogenic fluid Epigenetic alteration uranium metallogenic mengqiguer sandstone type uranium deposit

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