High-resolution sequence stratigraphy and its controls on uranium mineralization——Taking Middle Jurassic Qingtujing Formation in Chaoshui Basin as an example

By applying the high-resolution sequence stratigraphy, the different sub-divisions of base-level cycles of Qingtujing Formation, Middle Jurassic in Chaoshui Basin are analyzed in detail. 23 short, 3 middle and 1 long base-level cycles are recognized. On the above basis, the corresponding frameworks of high-resolution sequence stratigraphy have been established in northern and southern sub-basins respectively, and the detailed sedimentary facies of MSC1-3 and the special distribution of Qintujing Formation are discussed. It is pointed out that MSC2 is the most favorable layer for the localization of sandstone-type uranium deposits.