郯庐断裂带江苏段第四纪活动性研究

Research on Quaternary Activity in Jiangsu Sector of the Tan-Lu Fault Zone

从前人地表地质、地球化学探测与构造年代学,形变资料等方面入手,结合遥感影像信息,对郯庐断裂带江苏段第四纪活动性进行了系统分析;在总结前人研究成果基础上,对其活动性差异的成因进行了探讨。结果表明:郯庐断裂带江苏段在第四纪新构造运动时期总体活动性不强,表现为右旋走滑性质。断裂以宿迁为界具有明显的分段活动差异性——北段较强,南段较弱;在北华北块体内部,郯庐断裂带通过其活动性的分段差异调节次一级块体的不同方向位移;枣庄—宿迁断裂对郯庐断裂带的切割及其左旋走滑调节作用是郯庐断裂带江苏段活动差异性的主要成因。

Based on former geological section data, geochemical detection, structure chronological analysis data and crust deformation data, together with remote sensing imagery interpretation, we systematically analyze the qua- ternary activity in Jiangsu sector of the Tan-Lu fault zone. Furthermore, based on the former research results, the generation mechanisms of its segmentation is discussed. The results show that the movement of Jiangsu sec- tor of Tan-Lu fault zone is not intense during geotectonic era. It is featured by dextral strike-slipping and is di- vided into two main segments by different active intensity. The intensity in north part is stronger than the one in- the south part. In the north of North China plate, the different movement intension between them accommodated displacement motion of blocks. The Zaozhuang-Suqian fault＇s division and sinistral strike-slipping adjustability is the main mechanism of Jiangsu sector of Tan-Lu fault zone.