摘要
抽水蓄能电站建于基岩中。文中运用变形岩石显微构造分析方法和同位素年龄测定法重点分析测试了场区三个主要断层—F_(7012)、F_1和F_9中的断层岩和方解石脉。测试结果得出三条断层都有多期活动,早期活动相当强烈,并在规模较大的F_1断层上发现有古地震遗迹,后来断层活动的强度逐斩衰减。F_(7012)断层最后一次较强烈活动的时代为距今20万年前左右,活动时的差应力约120MP,具有左旋滑动的性质,断层活动的上限时间为距今15万年前左右。
Guangzhou Water -pumping Energy-storage Power Station is built in an area with the exposed bed rocks. On the basis of field investigation, laboratory analysis of many samples of fault rocks and calcite veins collected from 3 main faults F7012,F1-and F2.area in the site was made. Microstructural analysis and isotopic dating techniques were used and the results show that the three faults have experienced multiphase faulting, the early activity was rather intense and was ccompanied with the occurrence of palaeoearthquake; then the activities became gradually weaker. The last strong faulting on the fault F7012 with left-lateral slip occurred about 0. 2 Ma ago and the differential stress during the faulting was some 120 MPa. There is no obvious activity along the fault zones since 0. 15 Ma B. P.
出处
《华南地震》
1992年第4期9-21,共13页
South China Journal of Seismology
基金
国家自然科学基金助项目
关键词
抽水
蓄能
电站场址
断层活动性
Calcite vein, Fault gouge, Isotopic dating, Fault activity.
