Producing condition and evolving progress of the tidal sand bodies in the northern Jiangsu and the southern Huanghai Sea

A comprehensive study, on analyses data of the stratigraphic sequence, magnetic fabric and detrital nuneral of typical cores and geological ladar prosecting, indicates that the tidal sand bodies in the northern Jiangsu and the southern Huanghai Sea have been deposited since the regressive period of Holocene epoch, the convergent-divergent tidal current and silt supplied by longshore current from the Changjiang River and the Huanghe River are chief producing conditions.The convergent-divergent tidal field, which has been existing ever since, at least, initial deposition phase of the subrecent tidal sand body in the northern Jiangsu.is intrinsic for the southern Huanghai Sea.Great river did not supplied silt in the congressive period but the regressive period of Holocene epoch.It is impossible to have a delta in Qianggang.The evolution of the tidal sand bodies was mainly controlled by supply-silt amount per year of the Changjiang River and the Huanghe River, and has undergone three stages:embryonic growing stage, developing stage and adjusting stage.