【摘要】 本文是以金山卫某海底工程进行地质地貌调查和评价的基础上从水动力特性、泥沙特征和地质条件,三方面来探讨金山卫深槽地区的地貌发育和演变情况.认为深槽的演变受晚更新—全新世新构造运动,和大金山与小金山之间所通过的水道,沿地层错断,以及地质边界条件所控制.更多还原

【Abstract】 This article discussed the geomorphologic development and evolution in the trough area near Jinshanwei from the hydrodynamic characteristics, sedimentary characteristics and geological boundary conditions.1) The data of geophysical exploration show that there were neotectonic movements from Late-Pleistocene to Holocene Epoch in the trough area mainly in the form of slow movement of uplifting and subsidence, which resulted in dislocations of Quaternary strata in some areas. At the same time, there were also the stratigraphic displacements caused by atectonic stress, landslide. From these movements it is known that the strata of the trough areas are not very stable.2) On the basis of the above-mentioned informations, we considered that the trough near Jinshanwei was formed by the scouring of the powerful tidal currents which passed the waterway between Dajinshan and Xiaojinshan and increased its energy due to the restriction of landform along the zone of the Quaternary stratigraphic dislocations.3) The trough evolution is controlled by the changes of hydrodynamics, it is also influenced by conditions of the geologic boundary and lithological characters of the sediments.更多还原