Abstract: To study the activity feature, phase and time of the faults in a bedrock exposing region, a series of samples of fault rocks and fault gouges are collected along the Kangding-Moxi fault segment. TL. ESR. K-Ar techniques,analyses of quartz surface texture and deformation microstructure are used for the comprehensive research. The results show that the fault segment has undergone multiperiodic activity with multiple types (ductile shearing-brittle fracture) and multiple patterns (left-lateral-right-lateral),and the lower limit of the lost strong activity was around the end of late pleistocene or the begining of Holocene (ca. 10000 years).

Key words: Kangding Moxi fault, Fault activity, Fault material, Isotopic dating, Surfase texture of quartz, Microstructural analysis

摘要： 为了探讨基岩裸露区断层的活动特征、期次和时间,在鲜水河断裂带东南段的康定-磨西断裂段采集了一系列断层岩和断层泥样品,运用TL、ESR、K-Ar、石英形貌分析和变形显微构造分析法进行了综合测试。结果表明,断裂段经历了多种机制(韧性剪切和脆性断裂)、多期次、多种运动方式(左旋和右旋)的活动,最新一次较强烈活动的下限时间是晚更新世末或全新世初。

关键词: 康定-磨西断裂, 断层活动, 断层物质, 同位素测年, 石英形貌, 显微构造