河北承德红石砬-大庙断裂带初析

A PRELIMINARY STUDY ON THE HONGSHILA-DAMIAO FAULT BELT IN HEBEI PROVINCE

河北承德红石砬—大庙断裂带由数十米至数百米宽的韧性剪切带和脆性碎裂岩带组成,多期多次活动,早期为韧性变形,中期为脆—韧性变形,晚期为脆性变形。包体测温获得早期糜棱岩的形成温度为260℃。根据宏观地质观察和微观研究,该断裂带从元古代至新生代的活动和演化特点为从深层次向浅层次演化;断裂变形则从强韧性变形、脆—韧性变形向脆性变形的方向演化;断裂的活动带也由南向北依次迁移。

Hongshila-Damiao fault is a fault belt consisting of ductile shear zones and brittle cataclastite zones,ranging from several ten meters to several hectometers in width. Its activity characterized by multiple periods and times. The nature of the fault belt is ductile deformation in the early stage, brittle-ductile deformation in the middle stage, and brittle deformation in the late stage. The temperature of the early mylonite formation is about 260℃ by measuring temperature of inclusion. According to the macroscopic geological observations and microscopic studies, laws of activity and evolution of the fault belt from Proterozoic era to Cenozoic era are as follows. It evolved from deep level to shallow one, the feature of its deformation evolved from strong ductile deformation to brittle deformation, active belt of the fault migrated from south to north.