Reconstruction of sedimentary process of coarse-grained foresets from description of Tertiary fan-delta foreset beds and flume experiments

通过对第三系范德尔塔沉积的描述和混合粒度沉积物的水槽实验，研究了粗粒前滩的沉积构造及其沉积过程。在前驱沉积过程中，沉积物颗粒由于直径的不同而表现出的不同行为，对前驱沉积结构的转变起着重要作用，即细颗粒的扩散和粗颗粒的耗尽、颗粒流和细粒的混合以及颗粒流中的分选过程。

Sedimentary structures and their depositional processes of coarse-grained foresets were investigated by description of Tertiary fandelta deposit and flume experiments using mixed-sized sediments. During a foreset deposition, the different behaviors of sediment grains due to their diameters are important on the transition of a foreset sedimentary structure, i.e., diffusion of fine grains and depletion of coarser grains, mixing of grain-flow of granules and fines, and sorting processes within grain flows.