沂沭断裂是一条纵贯山东的深大断裂带。本文通过对该断裂带断裂构违岩显微变形研究,认为该断裂带在其发展演化过程中经历了塑性变形,塑脆性变形,脆性变形3个阶段。本文主要对其脆性变形阶段进行了研究,认为断裂带在该变形阶段至少经历了6次较为强烈的构造变动,进一步确定了造成这些变动的主压应力方位。 Yishu fault is a deep fault zone that runs through Shandong. In this paper, through the study of the micro-deformation of the fault rock in the fault zone, it is believed that the fault zone undergone three stages of plastic deformation, plastic brittle deformation and brittle deformation during its development and evolution. In this paper, the brittle deformation stage is mainly studied. It is considered that the fault zone experienced at least six strong structural changes during this deformation stage, and the orientation of the principal compressive stress that caused these changes was further confirmed.