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本文在野外实地调查的基础上,对北西向则木河断裂的第四纪构造活动特征、近代以及现今活动方式进行了探讨,并概括出其第四纪构造活动的模式。结果表明:该断裂带在第四纪早期以拉张性的断陷活动为主,断陷规模、幅度以西昌一带为最大,向南东方向逐渐减小。晚第四纪以来该断裂带主要表现为强烈的左旋水平扭动。同时,在西昌附近,在近东西向断裂活动的影响下,形成了最新的断陷盆地与倾针抬升山地。
Based on field investigation in the field, this paper discusses the characteristics of the Quaternary tectonic activity in the northwestern Zemuhe fault, the modern and current activities, and summarizes the mode of Quaternary tectonic activity. The results show that the fault zone was dominated by extensional faulting activities in the early Quaternary, and the scale and amplitude of the fault zone are the largest in the Xichang region and gradually decrease in the southeast direction. Since the Late Quaternary, the fault zone mainly showed strong left-lateral wiggle. In the meantime, the latest fault basins and uplifts are formed in the vicinity of Xichang under the influence of near-east-west fault activities.