【摘要】 用磷灰石的裂变径迹年龄及径迹长度变化规律 ,证实仙女山断裂带发生断裂的时期为距今 0 .7Ma左右 ;从讨论的各种绝对年龄结果分析 ,均未见到全新世以来有明显的活动迹象 ,以此确定仙女山断裂的活动性对三峡枢纽工程并不构成威胁更多还原

【Abstract】 In terms of the fission tracking age of apatite and the changing trend of length of tracks, it was verified that the Xiannushan fault belt was formed at about 0.70 Ma B.P. From the analysis of the results of different absolute ages it is also found that there was no obvious tectonic activity since Holocene. The conclusion can be drawn that the tectonic activity of the Xiannushan fault belt will not endanger the Three Gorges projects.更多还原