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断层的年代测定是研究断层活动性的重要内容之一。然而，一个工程同一条断层会出现不同的测年结果，从而引起争议和难予决断。近年来我们通过几个大型工程区域稳定性研究，对此获得了一些认识。本文以洮河九甸峡地区几条主干断层为研究对象，采用同位素年龄测定与野外地质调查和显微构造分析相结合的方法，对断层测年问题作一分析和讨论，也许对岩土工程断层活动性研究有一定参考价值。
Chronology of faults is one of the important contents for studying fault activity. However, different dating results may appear on the same fault in a project, which causes controversy and determination. In recent years, we got some understanding through the research on the regional stability of several large-scale projects. In this paper, several main faults in the Jiudianxia area of the Bahe River are selected as the research objects. By means of the combination of isotope age determination with the field geological survey and microstructure analysis, the problems of the fault dating are analyzed and discussed, and the geotechnical engineering Fault activity research has some reference value.