沂沭断裂带内部的差异活动及其成因分析

Differential activity within Yishu fault zone and its caus es of formation

郯庐断裂带在山东境内被称为沂沭断裂带的部分是其新构造活动最为强烈的一段。许多学者对沂沭断裂带做过大量研究工作,指出沂沭带活动存在差异性,但较少关于差异活动的原因分析。本文在前人研究工作基础上,较为深入地分析了沂沭带5条断裂的主要活动规律及其特点,对沂沭带进行了新的分段,并归纳了沂沭带不同断裂之间、同一断裂不同段落之间的活动差异及其差异的基本特征。在此基础上,从地貌、断裂结构、断裂空间组合、现代运动、深部构造环境等几个方面,分析阐述了造成沂沭带差异活动的可能原因,为更深入地研究沂沭带提供了新鲜的启示和思路。

Yishu fault zone, which is the part of Tanlu Fault in Shandong area, is the most active one in new tectonic movement. A lot of work has been done on its differential activity, but fewer on its causes. The main activities and characteristics of the 5 faults in Yishu zone are analyzed in the paper. We rezoned the Yishu zone, and summed up the differences in their activities between different faults or different parts of one fault and their features. Based on this, the cause of the differential activity was discussed in the field of topography, fault structure, spatial combination of the faults, modern movement, deep tectonic environment, etc.