Abstract: Comparative studies have been made for the ages of Quaternary geomorphology along the Maomaoshan fault zone by using the age data of ¹⁴C and TL,fault scarps calculated with diffusion equation,and loess palaeosoil sequence. Based on the obvious grouping features of horizontal and vertical displacement distribution,the average slip rates in different time spans for each segment of the Maomaoshan fault zone have been obtained. Since late Middle Pleistocene,the average horizontal slip rate of the strike slip segment along the Maomaoshan fault is about 2.3～3.9mm/a,vertical slip rate is about 0.07～0.19mm/a,and the average vertical slip rate of the Tianzu basin dip slip segment is about 0.11～0.86mm/a. The slip rates along the Maomaoshan fault zone are characterized by remarkable inhomogeneity. The horizontal displacement has cumulative slip deficit from east to west,while the vertical displacement has the nature of compensation.

摘要： 利用¹⁴C、热释光(TL)样品年代及扩散方程计算结果,结合区域黄土剖面中古土壤年龄,对毛毛山地区晚第四纪各级地貌年龄进行了对比研究。根据毛毛山活动断裂水平位移和垂直位移分布明显的分组特征,求得毛毛山断裂带不同段落不同时段的平均滑动速率。大约自中更新世晚期以来,毛毛山断裂走滑段的平均水平滑动速率为2.3～3.9mm/a,垂直滑动速率为0.07～0.19mm/a;天祝盆地倾滑段垂直滑动速率为0.11～0.86mm/a.沿断裂带滑动速率具明显的非均匀性特点,表现为自东向西水平位移具累积滑动亏损特征,垂直位移则具补偿性。

关键词: 活断层, 地层剖面, 古气候, 断层位移速率