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对宜昌市唐家湾附近出露的白垩系剖面进行了野外描述和取样,探讨了白垩系砂岩沉积物的粒度参数特征。出露地层剖面粒序变化较大,整体呈现砂包泥的特征,交错层理发育,反映沉积过程中的动力变化过程;沉积物平均粒径、分选系数、偏态、峰态等粒度参数显示,各样品粒度参数规律一致,指征了当时沉积区域水动力条件较强且稳定的特点,沉积物粒度各组分中跳跃总体十分发育,是最具代表性的白垩系辫状河相沉积。
The Cretaceous profiles exposed near Tangjiawan in Yichang City were described and sampled in the field. The characteristics of grain size parameters of Cretaceous sandstone sediments were discussed. The sequence of exposed strata changed greatly with the change of granulometry, showing the characteristics of sands and mudslides. The stratified stratification developed to reflect the dynamic process of sedimentation. The average particle size, sorting coefficient, skewness and kurtosis The results show that the particle size parameters of all samples are consistent with each other, which indicates that hydrodynamic conditions in the sedimentary area were strong and stable at that time. The hopping of the sediment particle size is generally well developed and is the most typical Cretaceous braided river sediment.