上海及其邻区楔形断裂系统的年代学、几何学与运动学特征

THE CHRONOLOGIC、GEOMETRIC AND KINEMATIC FEATURES OF THE WEDGE-SHAPED FRACTURE SYSTEM IN SHANGHAI AND ITS NEIGHBOURHOOD

本文在论证上海及其邻区楔形断裂系统存在的基础上,综合了断层泥中石英碎砾表面结构的扫描电镜研究结果,小型构造、显微构造与岩石组构特征,新构造运动特点,第四系沉积层的平面分布与厚度变化规律,地球物理场及历史地震震中分布与震源深度所反映的深部构造状态等多方面实际资料,初步确定了上海及其邻区楔形断裂系统的相对活动年代,分析了所论楔形断裂系统不同演化阶段的滑移线场,并建立了其几何学与运动学构造模式。

Based on the confirmation of the existence of the wedge-shaped fracture system in Shanghai and its neighbouring area, and following the synthesis of such informa. tion as the surface textures of Quartz fragments from the fault gauge under the Scanning Electronic Microscope, the minor structures, microstructures, and tectonite fabric, the characteristics of the neorectonic movement, the distribution and variation in thickness of the Quaternary sediment, the deep-seated tectonics reflected by the geophysical field, epicenter distribution and the depth of focuses of the historic earthquakes, the authors have preliminarily determined the relative date for the wedge-shaped fracture system and suggested the slip-line-field in the fracture system during its different evolution phases, and finally established the tectonic model for the wedge-shaped fracture system.