摘要
通过对新疆博—阿断裂带中东段的实地调查,发现断裂在吐鲁番盆地西南山前冲洪积扇上形成了冲沟右旋错动、断层陡坎、挤压隆起等与断裂活动相关的典型断错地貌。对比区域地貌面的分布和年龄,并结合测年结果,认为研究区内主要分布了3期冲洪积扇,并对应3级河流阶地。实测Fan3冲洪积扇上冲沟的最大右旋位错达40.8 m,其余分布在22～27 m区间内,Fan2冲洪积扇上冲沟的右旋位错达26.5 m,结合光释光年代样品的测试结果,得到1.8万年以来断裂平均右旋走滑速率为(1.42±0.18)mm/a。
The Bolokenu-Aqikekuduke fault is a large right-lateral strike-slip fault. There are many geomorphic features related to fault activities in southwest of Turpan basin, such as gully right lateral displacement, fault scarp, pressure ridge .Though field geomorphology investigation,it has been found that three periods of alluvial-pluvial fans are distributed in front of Jueluotage mountain. The largest right-lateral displacement is about 40.8 m on the Fan3 alluvial-pluvial fan, majority of the values is between 22~27 m, the right-lateral displacement is about 26.5 m on the Fan2 alluvial-pluvial fan, taking the results from the OSL dating,it concludes that the minimum right-lateral slip rate is(1.42±0.18) mm/a since 18 ka BP.
作者
马建
吴国栋
MA Jian;WU Guodong(Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi 830011, China)
出处
《高原地震》
2019年第1期20-25,共6页
Plateau Earthquake Research
关键词
博-阿断裂带
晚第四纪
走滑断层
滑动速率
Bolokenu-Aqikekuduke fault
Late quaternary
Strike slip fault
Slip rate
