豫西三门峡地区温塘断裂第四纪活动性研究

乔龙; 王磊; 郭长辉; 塔拉; 沈小七

doi:10.11899/zzfy20220206

豫西三门峡地区温塘断裂第四纪活动性研究

doi: 10.11899/zzfy20220206

中国地震局第一监测中心, 天津 300180

基金项目: 国家自然科学基金（41974011）；中国地震局第一监测中心科研基金（FMC2017011）；三门峡城市活断层探测与地震危险性评价项目（HT-2017-01）

详细信息

作者简介:
乔龙，男，生于1988年。工程师。主要从事活动构造与震害防御研究。E-mail：ql8851@163.com

通讯作者:
王磊，男，生于1974年。高级工程师。主要从事活动断层探测与震害防御研究。E-mail：wangl9812@qq.com

2 刘尧兴，王志铄，余华等. 2004. 温塘断裂活动性及其发震机制研究. 河南省科技攻关项目研究报告.
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出版历程
- 收稿日期: 2022-02-20
- 刊出日期: 2022-06-30

Study on the Quaternary Activity of the Wentang Fault in Sanmenxia Area, Western Henan Province

The First Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China

摘要

摘要: 温塘断裂位于鄂尔多斯块体东南缘，是三门峡盆地的东边界控制断裂，准确厘定其活动性对于理解区域构造演化和判断三门峡地区地震危险性具有重要意义。运用野外地质地貌调查、联合钻孔剖面探测及光释光定年技术，对三门峡地区温塘断裂的活动性进行分析与研究。结果表明，温塘断裂南段出露地表，线性特征明显，断层最新活动时代为晚更新世；温塘断裂中段为第四纪隐伏断裂，断层活动时代为中更新世；温塘断裂北段断层出露，断层活动时代为中更新世。
- 三门峡 /
- 温塘断裂 /
- 分段 /
- 第四纪 /
- 活动性
Abstract: The Wentang fault is located in the southeast margin of the Ordos block and is the control fault of the eastern boundary of the Sanmenxia Basin. The accurate identification of its activity is of great significance for understanding the regional tectonic evolution and assessing the seismic risk of Sanmenxia area. In this paper, the activity of the Wentang fault in the Sanmenxia area was analyzed and studied by field geological and geomorphological survey, joint borehole section and OSL dating technology. The results show that the southern segment of the Wentang fault is exposed to the surface with obvious linear characteristics, and the latest active age of the fault is late Pleistocene (34.7±2.3 ka). The middle part of the fault is Quaternary buried fault, the fault activity age is middle Pleistocene (137.49±17.0 ka). The fault of the north segment (Mianwa fault) is exposed and its active age is middle Pleistocene.
- Sanmenxia /
- Wentang fault /
- Segmentation /
- Quaternary /
- Activity
注释:

1) 2 刘尧兴，王志铄，余华等. 2004. 温塘断裂活动性及其发震机制研究. 河南省科技攻关项目研究报告.

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图 1 三门峡盆地地震构造

Figure 1. Seismotectonic structure map of Sanmenxia basin

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图 2 温塘断裂空间展布

Figure 2. Spatial distribution of Wentang fault

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图 3 温塘断裂南段断层三角面现象（镜向130°）

Figure 3. Triangular facet in the southern segment of The Wentang fault （Lens direction 130°）

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图 4 栾村东剖面

Figure 4. Section of east Luan Village

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图 5 王和村剖面（镜向55°）

Figure 5. Section of Wanghe Village （Lens direction 55°）

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图 6 钻孔位置分布

Figure 6. Location of boreholes

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图 7 钻孔联合剖面

Figure 7. Joint section of boreholes

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图 8 温塘断裂北段主断裂面（图（a）镜向220°；图（b）据刘尧兴等^①修改）

Figure 8. Fault facet of the northern segment of the Wentang fault （（a）lens driction 220°; （b） modified by Liu et al.）

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表 1 三门峡温塘断裂光释光测年结果

Table 1. OSL data of Sanmenxia Wentang fault

采样点	U-238/ μg·g⁻¹	Th-232/μg·g⁻¹	K-40/%	剂量率/Gy·ka⁻¹	等效剂量/Gy	年代/ka
WH-1	5.30±0.27	17.30±0.87	1.56±0.08	4.75±0.31	164.90±2.33	34.7±2.3
WH-2	4.21±0.21	15.20±0.76	1.57±0.08	4.24±0.26	272.41±2.65	64.3±4.0
LC-1	4.25±0.21	17.10±0.86	1.79±0.09	4.66±0.28	164.25±2.14	35.2±2.2
LC-2	3.66±0.18	15.60±0.78	1.68±0.08	4.23±0.25	184.71±1.76	43.7±2.6
LC-3	3.66±0.18	18.40±0.92	1.72±0.09	4.51±0.27	250.71±3.20	55.6±3.4
5-32.1	16.9±2.4	50.5±3.0	707.7±56.6	3.38±0.1	310.09±16.56	91.75±10.6
5-41.4	35.8±10.7	33.9±2.1	692.1±1.7	3.11±0.1	721.55±73.72	232.09±33.6
6-32.8	45.2±4.7	49.7±2.7	684.2±1.7	3.29±0.1	400.63±28.16	121.85±15.1
6-42.5	36.5±3.3	25.5±1.7	785.8±1.9	2.91±0.1	553.39±54.61	137.49±17.0
注：含水量估算为（10±2）%

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