上海及其邻区的楔形断裂系统

THE WEDGE-SHAPED FRACTURE SYSTEM IN SHANGHAI AND THE AREA ADJACENT TO IT

本文综合卫片解析成果、重磁异常、地貌形态、新生代沉积作用、新构造运动特征、古海岸线轮廓与变迁、历史地震震中分布以及断裂构造现象等多方面实际资料,初步确定了上海及其邻区楔形断裂系统的存在。文中指出:楔形断裂系统导源于先存的北东与北西向两组断裂系,它的存在构成了研究地区新生代期间主要地质事件发生的构造背景。

Based on the synthesis of such information as the satellite-photointerpretation, the gravity and magnetic anomaly, the topographical features, Quaternary sedimentation, neotectonic movement, the outlines of paleo-coastlines and their migration, the distribution of the historicepicenters and the result o f the freld geological investigation, it is preliminarily determined that there developed a wedge-shaped fracture system in Shanghai and the area adjacent to it. It is suggested that the wedge-shaped fracture system is derived from the NE fault system on the south of the area and the NW fault system on the north of the area, and that it formed the tectonic background of the major geological events which occurred during Cenozoic Era in the area.