Abstract: The study of recent fault activity in bedrock area,where no young sediments can be observed,is often fulfilled through the study of fault zone materials.The authors proposed that the formation periods of fault zone materials should be classified through macroscopic observation in the field and the microscopic analysis of the deformation features.The radiometric dating of the materials of different periods then can be carried out separately.For some dating techniques,it is necessary to determine the degree of "annealing" of the fault zone materials.Then a decisive result with reasonable interpretation can be obtained.

Key words: Fault rock, Fault activity, Microstructure, Isotopic age dating

摘要： 在缺乏新沉积层的基岩区研究断层新活动的时代,往往通过测定断层物质的年龄来进行。据此,用宏观观测与微观分析相结合的方法对断层物质进行期次划分,然后按其不同期次分别进行采样和年龄测定。对某些测年方法。还要判断断层物质的退火程度,这样才能得出地质意义更明确的结果,并给予更合理的解释。

关键词: 断层岩, 断层活动性, 显微构造, 同位素年龄测定