【摘要】 笔者曾研究过四川泸定县磨西断裂,长英质糜棱岩就发育于该断裂的上盘,厚60多公尺。根据长英质糜棱岩的组构与显微构造的观察结果,提出长英质糜棱岩的形成机制。更多还原

【Abstract】 The Moshi fault in Luding County of Sichuan has been studied. A felsic mylonite belt was developed on the hanging wall of the Moshi fault.It is more than Sixty meters wide. Based on investigation of fabric and microstructure of felsic mylonite from Moshi fault, the mechanism of origin of felsie mylonite is brought forwarded.Apparent flow structure exhibited by microscopical recrystallized quartz and sericite within felsic mylonite are features of plastic deformation. As to felsic mylonite, their characteristic microstructures are produced by dynamic recrystallization of quartz and sericite. And feldspar is mainly deformed by brittle fracturing. Two mechanisms of dynamic recrystallization have bee recognized, that is subgrain-rotation recrystallization and grain-boundary moving recrystallization. According to recrystallized grain size of quartz, a differential stress value of faulting has been estimated; it is 0.510～1.839 kb.更多还原