仙女山断裂带位于三峡工程——三斗坪大坝西南20km处,实验样品采自仙女山断裂带北端的荒口断裂,从断裂带中的断层泥、断裂壁岩和断裂围岩内各选出磷灰石,用磷灰石的裂变径迹年龄及径迹长度变化规律.研究证实:仙女山断裂带发生断裂时期为距今(0.7±0.04)Ma,与其围岩测定的形成时代(25.31±2.8)Ma截然不同,从讨论的各种绝对年龄结果,无论由断裂与第四系切割来看,均未见到全新世以来有明显的活动迹象,以此确认仙女山断裂活动性对三峡工程并不构成威胁. Xiannushan fault zone is located in the Three Gorges Project - Sandouping dam southwest 20km Department, the experimental samples collected from the northern tip of Xiannushan fault zone mouth fracture, from the fault zone fault mud, fault wall rock and fault rock each elected Apatite, apatite fission track age and track length.The study shows that the faulting period of Xiannushan fault zone is (0.7 ± 0.04) Ma, and the formation age of the surrounding rock (25.31 ± 2.8) Ma, completely different from the discussion of the absolute age results, both from the fault and the Quaternary cutting point of view, have seen no significant signs of activity since the Holocene, in order to confirm the activity of the Xiannushan fault on the Three Gorges Project It does not pose a threat.