关键词: 华北, 韧性剪切系统, 基底弱化带, 地震活动性

Abstract: Based on the analysis of the formation and evolution of the crystalline basement for the North China platform, the characteristics of huge ductile shear zone are studied. The zone in point were formed during the early Proterozoic time and can be subdivided into three systems trending northeast, with a width va-ring from saveral hundred meters to more than twenty kilometres, strenching for some thousand kilome-tres. Along these zone reworked gneiss and mylonite have been commonly developed. The relationship between the successive activition of major basement weakness zones that occurred later on and seismic activities is discussed here along with the general trend of recent adjustment of dis-placements and regular seismic activities.

Key words: North China, Ductile shear system, Basement