Quaternary Activity Identification in the Huaibei Section of Subei Fault
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摘要: 通过浅层地震反射勘探、钻孔联合剖面探测和新构造年代学测试等方法，对宿北断裂淮北段的第四纪活动习性进行了研究。浅层地震反射勘探结果表明，宿北断裂淮北段断错了第四纪地层，断面波发育，断层上盘地层受断层牵引变形明显，属于区域性的大断裂。钻孔联合剖面探测结合新构造年代学测试结果显示，宿北断裂淮北段最新活动时代为中更新世中晚期，其在中更新世中晚期以来的最大垂直滑动速率约为0.011 mm/a，中更新世以来的最大垂直滑动速率约为0.009 mm/a，表明宿北断裂淮北段在中更新世以来的活动强度较低且没有显著增强的趋势。宿北断裂是徐宿弧形构造的伴生构造，二者具有相同的新老构造运动特征。宿北断裂早期以左行走滑兼逆冲为主，后受新构造运动的影响，宿北断裂淮北段和宿州段在进入第四纪以来可能以青龙山断裂附近为界，表现出较明显的“淮北段较强、宿州段稍弱”差异化张性活动特征。研究结果对淮北市和宿州市的地震灾害风险评估具有重要指导价值。Abstract: The Quaternary activity habits of the Huaibei section of Subei fault were studied by means of shallow seismic reflection exploration, borehole joint profile detection and neotectonic chronology test. The results of shallow seismic reflection exploration show that the Huaibei section of the Subei fault has broken the Quaternary strata, the section wave is developed, and the upper wall of the fault is obviously deformed by the fault traction, which belongs to the regional large fault. The results of borehole combined profile detection and neotectonic chronology test show that the latest activity age of the Huaibei section of Subei fault is in the middle and late Middle Pleistocene. The maximum vertical slip rate since the middle and late Middle Pleistocene is about 0.011 mm/a, and the maximum vertical slip rate since the middle Pleistocene is about 0.009 mm/a, indicating that the activity intensity of the Huaibei section of Subei fault since the middle Pleistocene is low and there is no significant increase trend. Subei fault is an associated structure of Xusu tectonic arc, both of which have the same characteristics of new and old tectonic movements. In the early stage of Subei fault, it was dominated by left-lateral strike-slip and thrust. Later, under the influence of neotectonic movement, the Huaibei section and Suzhou section of Subei fault have been bounded by Qinglongshan fault since the Quaternary period, showing obvious differential tensile activity characteristics of ' strong in the Huaibei section and weak in the Suzhou section '. The research results have important guiding value for the earthquake disaster risk assessment of Huaibei City and Suzhou City.1)
1 2 北京防灾科技有限公司，2023. 淮北市活动断层探测与地震危险性评价项目-标准钻孔探测与第四纪地层剖面建立报告.2)2 3 北京防灾科技有限公司，2023. 淮北市活动断层探测与地震危险性评价项目-标准钻孔探测与第四纪地层剖面建立报告.3)3 4 北京防灾科技有限公司，2023. 淮北市活动断层探测与地震危险性评价项目-标准钻孔探测与第四纪地层剖面建立报告.4)4 5 安徽省震灾风险防治中心（安徽省地震工程研究院），2022. 宿州市城市活动断层探测及危险性评价项目子专题6-目标断层的晚第四纪活动性鉴定野外工作总结报告. -
图 1 研究区及邻区地质构造简图
Figure 1. Schematic diagram of geological structure in the study area and adjacent areas
图 2 L1测线浅层地震反射勘探时间剖面和深度解释剖面图
Figure 2. Seismic reflection exploration time profile and depth interpretation profile of line L1
图 3 L2测线浅层地震反射勘探反射勘探时间剖面和深度解释剖面图
Figure 3. Seismic reflection exploration time profile and depth interpretation profile of line L2
图 4 ZL-1钻孔联合剖面综合解释图
Figure 4. Comprehensive interpretation of ZL-1 borehole combined profile
图 5 宿北断裂局部展布特征图
Figure 5. The local distribution characteristic map of the Subei fault
表 1 浅层地震反射勘探测线参数
Table 1. Line parameters of shallow seismic reflection exploration
测线编号 起点坐标 终点坐标 测线长度/km 物理点数 东经 北纬 东经 北纬 L1 116°38'56" 33°43'38" 116°39′37″ 33°46'54" 6.018 609 L2 116°45′56″ 33°42′49″ 116°46′43″ 33°45′09″ 4.268 433 
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表 2 ZL-1钻孔联合剖面各钻孔信息
Table 2. Borehole information of ZL-1 borehole joint section
钻孔编号 坐标 孔深/m 东经 北纬 zk1 116°39′ 16.82765 ″33°45′ 17.60565 ″100 zk2 116°39′ 17.47848 ″33°45′ 20.47438 ″125 zk3 116°39′ 17.67588 ″33°45′ 18.97355 ″124 zk4 116°39′ 17.80851 ″33°45′ 19.73192 ″125 zk5 116°39′ 17.84205 ″33°45′ 20.15344 ″114 zk6 116°39′ 17.75571 ″33°45′ 20.27086 ″110 zk7 116°39′ 17.25123 ″33°45′ 18.29945 ″120 zk8 116°39′ 17.04315 ″33°45′ 17.96742 ″120.5
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表 3 光释光年代学样品测试结果
Table 3. The dating rusults of OSL samples
序号 编号 深度/m U Th K 年龄/ka 1 O1 6.8 2.81±0.39 13.94±0.76 1.76±0.06 49.79±3.32 2 O2 12.4 1.62±0.19 9.60±0.61 1.81±0.07 73.98±4.88 3 O3 19.8 2.54±0.26 12.40±1.18 1.77±0.08 110.45±9.39 4 O4 27.6 1.86±0.20 12.89±1.14 2.25±0.11 116.51±10.12 5 O5 38.4 2.30±0.27 12.55±1.17 1.64±0.06 112.80±10.52 6 O6 18.8 2.59±0.28 11.40±1.14 1.71±0.08 97.54±8.05 7 O7 28.9 1.70±0.19 12.66±1.06 1.79±0.07 103.28±8.57 8 O8 37.4 1.70±0.20 12.66±1.18 1.76±0.05 108.45±8.53 9 O9 9.1 1.95±0.26 13.70±0.97 2.22±0.08 72.95±5.78 10 O10 18.3 2.66±0.36 13.09±1.13 1.79±0.08 75.48±6.97 11 O11 29.5 2.05±0.24 11.20±0.83 2.05±0.08 119.49±11.70 12 O12 7.5 1.77±0.26 15.36±1.28 2.16±0.09 70.83±5.45 13 O13 18.9 2.26±0.32 11.28±1.04 1.94±0.08 72.42±5.61 14 O14 27.3 1.48±0.21 15.51±1.48 1.97±0.07 108.33±8.65
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表 4 电子自旋共振年代学样品测试结果
Table 4. The dating rusults of ESR samples
序号 编号 深度/m U Th K 年龄/ka 1 E1 81.2 1.45±0.06 8.03±0.16 2.36±0.09 438±47 2 E2 108.3 1.49±0.06 8.30±0.17 2.24±0.09 608±63 3 E3 112.9 2.46±0.10 7.66±0.15 1.99±0.08 648±70
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