沂沭全新世活动断裂分段边界的地质特征

本文以不同的成因机制为基础,对沂沭活断层的全新世活动部分进行了分段,继而主要讨论了分段边界的地表地质特征。 沂沭全新世活断层北起莒南左山,南至泗洪峰山。通过卫片解译分析、对横切主断层的北西向断层的野外调查和主断层的断层几何分析,笔者认为,位于郯城东北的分段边界,是一个以横向构造(归义—山左口断层)和主断层的错列起主要作用的、可能基岩岩性起一定影响的、空间上沿断裂方向延伸约10km的障碍体。

GEOLOGICAL CHARACTERISTICS OF SEGMENT BOUNDARY OF YISHU HOLOCENE ACTIVE FAULT

Based on different formation mechanism, Yishu Holocene active fault is segmented and the geological characteristics of segment boundary of the fault is discussed in this paperThe northern end of Yishu Holocene active fault starts at Zuoshan mountain, Junan county and its southern end is located at Fengshan mountain, Sihong county. According to the interpretation of satellie images, the field survey of NW-striking faulting which cross cuts the major fault and geometrical analysis of the major fault, author considers that the segment boundary located in northeastern Tancheng is an obstacle body, spatially extending along the fault direction with a length about 10km, which is formed mainly due to dis-arrangement of a transverse structure (Guiyi-Shanzuokou fault) with the major fault as well as the lithology of basement rocks also contributes to formation of segment boundary.