高分辨率层序地层特征及其对铀矿化的控制作用——以潮水盆地中侏罗统青土井组为例

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

应用高分辨率层序地层学原理,详细剖析了潮水盆地中侏罗统青土井组不同级次的基准面旋回。共识别出23个短期、3个中期和1个长期基准面旋回,在此基础上分别建立了潮水盆地南北亚盆地青土井组高分辨率层序地层对比格架,并对MSC1-3沉积相特征及其空间分布进行了详细研究,指出MSC2是砂岩型铀矿赋存最为有利的层位。

By applying the high-resolution sequence stratigraphy, the different sub-divisions of baselevel 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 southem 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.