五佛寺断层晚更新世活动段长度及活动方式研究

Study on Active Length and Pattern of Wufosi Fault in Late Pleistocene

通过野外地质调查,确定五佛寺、杨窝铺、窑洞水3条断层不构成左阶羽列;五佛寺断层晚更新世活动段展布于石板沟东—大台子北东,长度为8.3km,地质剖面中具有明显的宏观蠕滑特征,室内通过对断层泥进行扫描电镜等显微结构分析发现微观蠕滑特征,因此判断五佛寺断层晚更新世活动段活动方式为蠕滑,断层不会对小观音水库坝址造成影响。

According to geological survey in field, we define that the Wufosi fault, Yangwopu fault and Yaodongshui fault aren＇ t left-step pinnate arrangement, and that the active segment of the Wufosi fault in late Pleistocene unfolds from east of Shibangou to northeast of Dataizi, with a length of 8.3 km. There are obvious macroscopic creeping marks in the geology sections of the Wufosi fault, and the scanning electron microscope analysis in lab shows that the fault gouge has microscope creeping characteristics. So we judge that the active pattern of the Wufosi fault is creeping slip, which will not affect the Xiaoguanyin reservoir dam.