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通过对国内典型砂岩型铀矿—吐哈盆地十红滩矿床、伊犁盆地512矿床、鄂尔多斯盆地东胜矿床流体地质及其地球化学的研究,揭示了层间氧化带型铀矿流体作用的组成、成分、成因以及各主要蚀变流体的温度、PH,Eh,盐度、压力等物理化学性质.由流体包裹体分析认为流体的基本组成可分为两部分:一是为由包裹体氢、氧同位素特征可确认其为常温表生作用的大气降水,二为含CH4等烃类气体、CO2及少量H2S,CO,H2,N2等组分的天然气,在含油气盆地中往往含有少量的液态烃.氧化蚀变带流体性质往往是氧化碱性的,矿化作用阶段流体性质为中性或弱酸-弱碱及还原性,而在2次还原或还原作用带流体是强还原碱性的.流体中的含氧地下水是铀元素活化迁移的介质,而天然气中的CH4等烃类气体以及H2,H2S,CO等则是铀矿物沉淀的重要还原剂;流体环境的PH,Eh性质的转变是铀矿化形成的主要原因.
By studying the fluid geology and geochemistry of the typical sandstone-type uranium deposit-Tuha Basin, 512 ore deposit in Ili Basin and Dongsheng deposit in Ordos Basin, the composition of fluid interaction between interlayer oxidation zone-type uranium deposits is revealed. Composition, origin, physicochemical properties such as temperature, PH, Eh, salinity and pressure of the main fluid.It is considered from the fluid inclusion analysis that the basic composition of the fluid can be divided into two parts: Isotope characteristics confirm that it is atmospheric precipitation at ambient temperature. The second is natural gas containing CH4 and other hydrocarbon gases, CO2 and a small amount of H2S, CO, H2, N2 and other components, often containing a small amount of liquid hydrocarbons in petroliferous basins Oxidative alteration fluids tend to be oxidatively alkaline in their fluid properties, with fluid properties of neutral or weak acids - alkalis and reducibility during the mineralization stage and strongly reducing alkaline fluids during the second reduction or reduction. Oxygenated groundwater is the medium for the activation and migration of uranium. Hydrocarbons such as CH4 and H2, H2S and CO in natural gas are important reductants for the precipitation of uranium minerals. The change of PH and Eh in fluid environment is uranium Mineralization formation The main reason.