松辽盆地开鲁坳陷西部四方台组铀成矿条件及找矿方向OACSCDCSTPCD

Kailu depression is located in Southwest Songliao Basin.Based on the systematic analysis of uranium source,structure,lithology-lithofacies,sand body oxidation-reduction,hydrogeology and uranium mineralization characteristics in the western Kailu depression,the author believes that the Sifangtai Formation has the basic geo-logical conditions for sandstone type uranium mineralization.The statistical analysis of uranium content in the erosion source area and the sand body of the Formation indicates that there are abundant internal and external du-al uranium sources in the area.Deep reduction fluids can enter the Sifangtai Formation directly along the main faults,which also provide channels for groundwater discharge.The Sifangtai Formation has developed alluvial fan and braided river sedimentary system with stable mud-sand-mud structure,good groundwater recharge,diam-eter and drainage and hydrogeological conditions of uranium in water.In this paper,the relationship between oxi-dation zone,Th/U value of sand body,Fe2+/Fe3+ value and organic carbon content distribution are discussed.Urani-um mineralization is mainly controlled by key factors such as uranium source,structure,lithology&lithofacies and oxidation and reduction of sand body,etc.All metallogenic elements are well matched in the Sifangtai Forma-tion of the West Kailu Depression,where there is mineralization potential for forming of medium-size and above sandstone-type uranium deposits.