新疆开都河大山口水电站场区基岩中断层活动研究

新疆开都河大山口水电站位于南天山现代地壳构造运动仍十分活跃的地区，野外地质研究表明，通过工程区的洪水沟大断层新活动延续到晚更新世末期；工程区的小断层F9最后活动在晚更新世以前。通过对采自这两条断层的断层物质样品的变形显微构造、石英颗粒形貌和类型、TL年龄的分析测定，揭示出洪水沟大断层在工程区段的主活动期为上新世晚期至早更新世，中更新世以后己无明显活动；F9断层最后一次较强烈活动的上限时间为距今9万年左右。结果表明，电站坝区是地壳活动相对较稳定的、较好的场点。

RESEARCH ON FUILT ACTIVITY IN BASIC ROCKS IN DASHANKOU HYDROPOWER STATION ON KAIDUHE RIVER IN XINJING PROVINCE

The Dashankou Hydropower Station on Kaiduhe River, Xinjiang,is located in an area with highly active tectonic movement.The field evidance shows that the Hongshuigou fualt cutting through the station exhibited multi-phase activity by the end of late Pleistocene,while the last faulting on the small fault F9 occurred before late Pleistocene.We analysed the samples of fault materials collected along these two faults by means of analysis of microstructures,quartz surface structures and TL dating.The results reveal that the main period of activity is from the end of Pliocene to Early Pleistocene,and obvious activity had not occured since Middle Pleistocene along the segment of the Hongshuigou fault in engineering site;while the upper limit of time of last faulting is 90 ka along the F9. The dam area is a relatively stable area in modern tectonic activity and is a perfect engineering site.