Active Characteristics of the Middle Segment of Maniao-Puqian Fault in the Holocene
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摘要: 本文采用地球物理勘探和钻孔联合剖面探测相结合的方法，分别在林海三路和桃兰村展开探测，通过分析断层上断点埋深、断错地层序列和地层年龄，获得了马袅-铺前断裂的全新世活动特征。2排联合钻孔剖面均揭露出断面，断裂上断点埋深9.2—10.5m，从而准确厘定了马袅-铺前断裂中段的空间位置。钻探结果显示，马袅-铺前断裂分为近东西向平行分布的南、北2支，呈阶梯状发育，具正倾滑性质，倾向北，倾角约70°。其中，北支为第四纪早期次级断裂，南支为全新世活动性较强的主断裂。同时，钻孔揭示深度内该断裂段第四纪以来的垂直位移量约为4—6m，7965—7408a BP以来断裂有过活动，垂直位移量约1—2m，垂直位移速率约为0.26±0.1mm/a。Abstract: In this paper, geophysical exploration is combined with composite drilling section exploration, respectively in the Linhaisanlu and Taolan village, in order to study the Holocene activities of the Maniao-Puqian fault through the analysis of the depth of upper breaking point, faulted strata sequence and stratigraphic age. All the two composite drilling sections reveal the fracture of the fault, and the depth of upper breaking point is about 9.2m to 10.5m, which allow us to determine the space position of the middle fracture of the fault. The results of the drilling show that the fault is divided into two branches in north-south with stepped distribution characteristics, and both of them, nearly parallel, are normal slide faulting with about 70° dip. The northern branch is a fault that is active in the early Quaternary, and the southern branch is a main Holocene active fault. Meanwhile, drilling also reveals that the cumulative displacement in borehole depth is 4m to 6m before Quaternary, and the vertical displacement of the fault is about 1—2m since 7965—7408a BP. Based on the results of the stratigraphic age, we estimate that the vertical displacement rate of the section is about 0.26±0.1mm/a.
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图 1 马袅-铺前断裂中段地震构造简图
Figure 1. Seismic tectonic map of the middle segment of the Maniao-Puqian fault
图 2 振家村附近构造地貌调查与测量
Figure 2. The investigation and survey of landform at Zhenjia village
图 3 浅层人工地震勘探测线及钻孔位置平面图
Figure 3. Location of the shallow seismic exploration lines and the drill holes
图 4 林海三路(a)和桃兰村(b)浅层人工地震勘探剖面图
Figure 4. Profiles of the shallow seismic exploration at Linhaisanlu (a) and Taolan village (b)
图 5 林海三路钻孔联合剖面(zk1—zk6)
Figure 5. Combined section of the drill holes from zk1 to zk6 at Linhaisanlu
图 6 林海三路钻孔联合剖面(zk7—zk14)及断面照片
Figure 6. Combined section of the drill holes from zk7 to zk14 at Linhaisanlu
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