《Table 5 U content and chemical analyses of the braided delta plain deposits》

《Table 5 U content and chemical analyses of the braided delta plain deposits》   提示:宽带有限、当前游客访问压缩模式
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《"Dual Control of Depositional Facies on Uranium Mineralization in Coal-bearing Series: Examples from the Tuanyushan Area of the Northern Qaidam Basin, NW China"》


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The distributary channel deposits are connected with the upstream braided river channel and are vertically constricted by inter-distributary bay deposits.The interdistributary bay deposits not only provide the stable waterresisting layers enabling the formation of the typical U-rich lithological association(coal-U-coal)in this area,but also directly absorb a small amount of uranium(Wang Dan et al.,2015).The sandstones in this type of facies are characterized by an excellent connectivity and stratification,which are favorable for the flow of U-rich fluids.In this area,this type of sandstone has high concentrations of uranium(up to 70 ppm),and is considered the main source of U for extraction(Fig.7;Table 5).The braided river delta plain,as the main coalforming environment in the study area,is characterized by an association of the coal-uranium deposits.