摘要
五里冲水库地处侵蚀山区,缺乏第四纪地层作为研究断层新活动年代的对比标志。本文以F_1、F_2断层带内发育的多期方解石脉和断层泥为研究对象,采用显微构造分析,热释光(TL)测年法和扫描电镜(SEM)分析,石英溶蚀速率测年法,对库区F_1、F_2断层新活动的年代进行综合判定。确认:F_1、F_2断层最后一次明显活动的年代分别为(2.93±0.31)×10~5年和(2.33±0.26)×10~5年以前,为评估五里冲水库构造稳定性,提供了可靠的数据。
Wulichong reservoir is located ia an erosional mountainous area, and Quaternary beds are lacking to serve as a comparison index in our chronological study of the recent motions of the faults. Taking the calcite veins developed in several geologic periods and gouges as objects for the study, and by using the techniques respectively of microstructure analysis, TL dating, SEM analysis and dating by the corrosion rate of the quartz, this paper synthetically determines the ages of the recent motions of faults F1 and F2 in the reservoir area. It is concluded that the latest motions of faults F1 and F2 had taken place respectively before (2.93±0.31)×105 and (2.33±0.26)×105 years. Result of the study has furnished a reliable basis for evaluating the structural stability of the Wulichong reservoir area.
出处
《地震研究》
CSCD
北大核心
1991年第4期347-357,共11页
Journal of Seismological Research
关键词
水库
断层
年代
五里冲水库
活动
Age of recent motions of the fault
Microstructural analysis
SEM analysis
Wulichong reservoir area
Faults F1 and F2
