Characteristics of Uranium Mineralization from Interlayer Oxidized Zone in Dananhu Area of Hami, Xinjiang

Mineralized area lies to the east of Dananhu depression in east-southern edge of Turpan-Hami Basin of Xinjiang.The horizon of uranium mineralization is formed mainly in the upper and middle-upper lithologic member of Xishanyao Formation of Meso-Jurassic series,the upper member is mainly alluvial fan and braided stream deposit,and the middle-upper member is mainly meandering stream and deltaic deposit.The mean values of chemical analysis of orgC,CO₂,and ∑S are respectively 0.42%,4.19%,and 0.38% for diagnostic element of uranium ore,obviously higher than the mean values 0.34%,0.4%,and 0.14% of relevant rock in Danahu area,reflecting the uranium element enrichment is related to this.In uranium ore,the mean value of the 7 microelements analyzed are all higher than the relevant elements of Danahu area sandstone,indicating the interlayer oxidation maybe one of the reasons for microelement migration and enrichment.The thickness of uranium mineralization is 4.9 m,grade is 1.902×10^-4,and uranium content is 1.996kg/m².The shape of ore-body is platy.Pay rock are mainly brown-yellow and gray medium-coarse-grained feldspathic litharenite,sandy conglomerate,conglomerate.Rock primany geochemical type ore-bearing bed Meso Jurassic series Xishanyao Formation are black and grey in Danahu area.Uranium existent form is mainly adsorption shape.Uranium mineralization type is interlayer oxidied zone type.Uranium mineralization grew on reduction-oxidation intermediate zone,there was immediately genetic relationship between uranium mineralization and interlayer oxidied zone development.