郯庐断裂带江苏段第四纪活动特征及其动力学背景探讨

本文通过对郯庐断裂带江苏段开展的野外调查、深部构造和运动学特征等方面的研究,结合近年来最新的研究成果,对郯庐断裂带江苏段的第四纪活动特征及其动力学背景进行了探讨。郯庐断裂带江苏段第四纪活动具有东强西弱、北强南弱的特征;郯庐断裂带第四纪的逆冲活动主要受西太平洋弧后扩张的动力学因素控制;南华北与北华北地块深部构造特征和新构造运动的差异性,是导致郯庐断裂带各段活动性差异的重要原因。

A Discuss of the Characteristics of Activities in Quaternary for the Jiangsu Segment of Tan-Lu Fault Zone and Its Geodynamic Setting

Based on the field investigation of the Jiangsu segment of Tan-lu fault zone,integrated with the deep structures,kinematic characteristics and new research results in recent years,we discuss the characteristics of activities in quaternary for the Jiangsu segment of Tan-Lu fault zone.The activities of the Jiangsu segment are increased from south to north and from west to east.The thrusting movement with dextrorotation of Tan-Lu fault zone in quarernary was controlled by the back-arc spreading due to the subduction of west Pacific plate.The charateristics in deep structures between Southern North China block and northern North China block and the distinction of neotectonics are the significent reason for the diffe-rent characteristics of activities of each segment of Tan-Lu fault zone.