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川西理塘-义敦断裂措普湖段第四纪晚期滑动速率与古地震序列

王世元 王竞 李福鹏 陶志刚 梁明剑 刘韶 屈淼 张力文 曾维祖 晋云霞

王世元, 王竞, 李福鹏, 等, 2024. 川西理塘-义敦断裂措普湖段第四纪晚期滑动速率与古地震序列. 地质力学学报, 30 (2): 275-288. DOI: 10.12090/j.issn.1006-6616.2023060
引用本文: 王世元, 王竞, 李福鹏, 等, 2024. 川西理塘-义敦断裂措普湖段第四纪晚期滑动速率与古地震序列. 地质力学学报, 30 (2): 275-288. DOI: 10.12090/j.issn.1006-6616.2023060
WANG Shiyuan, WANG Jing, LI Fupeng, et al., 2024. Late quaternary slip rate and paleoseismic sequence of the Cuopuhu section of the Litang-Yidun fault, western Sichuan, China. Journal of Geomechanics, 30 (2): 275-288. DOI: 10.12090/j.issn.1006-6616.2023060
Citation: WANG Shiyuan, WANG Jing, LI Fupeng, et al., 2024. Late quaternary slip rate and paleoseismic sequence of the Cuopuhu section of the Litang-Yidun fault, western Sichuan, China. Journal of Geomechanics, 30 (2): 275-288. DOI: 10.12090/j.issn.1006-6616.2023060

川西理塘-义敦断裂措普湖段第四纪晚期滑动速率与古地震序列

doi: 10.12090/j.issn.1006-6616.2023060
基金项目: 

国家自然科学基金项目 2019QZKK0708

中国地震局星火计划 XH24036B

中国地震局地震工程与工程振动重点实验室重点专项 2021EEEVL0101

详细信息
    作者简介:

    王世元(1982—),男,硕士,高级工程师,从事活动断层、地震灾害和工程地震相关工作。Email:544756125@qq.com

    通讯作者:

    王竞(1993—),女,硕士,工程师,从事活动断层、地震灾害和工程地震相关工作。Email:6277251285@qq.com

  • 中图分类号: P546;P65

Late quaternary slip rate and paleoseismic sequence of the Cuopuhu section of the Litang-Yidun fault, western Sichuan, China

Funds: 

the National Natural Science Foundation of China 2019QZKK0708

the Spark Program of the China Earthquake Administration XH24036B

the Scientific Research Fund of the Institute of Engineering Mechanics, China Earthquake Administration 2021EEEVL0101

  • 摘要: 理塘-义敦断裂是川滇菱形块体内部一条延伸约130 km的全新世活动的左旋走滑断裂带,是川西理塘地区地震活动的重要控震构造,目前其北段的措普湖段研究程度相对较低。将理塘-义敦断裂措普湖段作为研究对象,运用野外勘察、高精度测绘、探槽与14C测年等方法对措普湖段进行滑动速率和古地震探究。开挖的2处探槽位于冬欧山坡麓处,通过识别探槽内断裂与地层的切割关系、地层沉积特征、断层运动性质等标志;共识别出4次古地震事件:事件Ⅰ发生于BC 3382± 60 a之前;事件Ⅱ发生于BC 3382±60 a~BC 1094±51 a之间;事件Ⅲ与事件Ⅳ均发生于AD 1330±44 a之后。可以推断理塘-义敦断裂措普湖段具有大概率的古地震复发间隔为2.4 ka左右,不排除有小概率复发间隔0.4±0.3 ka的可能。理塘-义敦断裂措普湖段古地震事件与大毛垭坝段和理塘段古地震事件之间存在差异,但是不同分段断裂的地震活动性在全新世以来均表现出持续增强趋势。根据测绘断错地貌和末次冰期冰碛垄推算出晚更新世以来措普湖段平均滑动速率为4.15±0.5 mm/a,与理塘-义敦断裂第四纪晚期不同分支滑动速率处于同一量级水平。文章完善了理塘-义敦断裂的构造特征全貌和古地震、滑动速率等信息,有助于更好地理解该断裂及该地区地震活动史和构造变形模式,为今后地震的中长期预测提供更多的数据,同时也有助于川藏铁路沿线相关工程的地震风险评估。

     

  • 图  1  川滇菱形块体及周边主要断层分布图

    YS-GZF—玉树-甘孜断裂;XSHF—鲜水河断裂;ANHF—安宁河断裂;DLSF—大凉山断裂;ZMHF—则木河断裂;XJF—小江断裂;HHF—红河断裂;ZD-DJF—中甸-大具断裂;JSJF—金沙江断裂;LTF—理塘断裂;F1—理塘-义敦断裂理塘段;F2—理塘-义敦断裂大毛垭坝段;F3—理塘-义敦断裂措普湖段
    a—理塘断裂位置示意及川滇菱形块体周边主要断层分布图;b—理塘-义敦断裂及措普湖段断层分布图

    Figure  1.  Distribution map of the Sichuan-Yunnan rhomboid block and surrounding major faults

    (a) Location of the study area and surrounding major faults; (b) Distribution of the Litang-Yidun fault and the Cuopuhu section
    YS-GZF-Yushu-Ganzi fault; XSHF-Xianshuihe fault; ANHF-Anninghe fault; DLSF-Daliangshan fault; ZMHF-Zemuhe fault; XJF-Xiaojiang fault; HHF-Honghe fault; ZD-DJF-Zhongdian-Daju fault; JSJF-Jinshajiang fault; LTF-Litang fault; F1-Litang section of the Litang-Yidun fault; F2-Damaoyaba section of the Litang-Yidun fault; F3-Cuopuhu section of the Litang-Yidun fault

    图  2  理塘-义敦断裂措普湖段断层几何展布特征

    Figure  2.  Geometric distribution of the Cuopuhu section of the Litang-Yidun fault

    图  3  措普湖段南东端断层地貌(红色箭头指示断层走向)

    a—断层切过山前形成槽谷地貌;b—断层切过山前,形成明显坡折带;c—断层切过山前形成反向槽谷、山前坡折带等地貌;d—断层断错最新一期冲洪积扇

    Figure  3.  Fault topography at the southeastern end of the Cuopuhu segction (red arrows indicate fault trend)

    (a) Fault cutting through the mountain front forms a trough-valley landform, oriented towards SE; (b) Fault cutting through the mountain front creates distinct slope folding zones, oriented towards S; (c) Fault cutting through the mountain front forms reverse trough-valleys, mountain front slope folding zones, oriented towards E; (d) Fault dislocating the latest alluvial fan, oriented towards N

    图  4  措普湖东断错地貌

    a—措普湖东断错地貌影像图;b—措普湖东断错地貌实测图

    Figure  4.  Fault scarps in the eastern Cuopuhu section

    (a)Geomorphic image of the fault scarps; (b) Measured map of the fault scarps

    图  5  措普湖西断错地貌

    a—措普湖西实测微地貌位错图,红色箭头指示断层走向;b—措普湖西断错地貌影像图

    Figure  5.  Fault scarps in the western Cuopuhu section

    (a) Measured micro-topographic displacement map of the western Cuopuhu segment, with red arrows indicating the fault direction (oriented towards NE); (b) Geomorphic image of the fault scarps

    图  6  理塘-义敦断裂措普湖段水平平均滑动速率

    Figure  6.  Average horizontal slip rate of the Cuopuhu section of Litang-Yidun fault

    图  7  措普湖段TC1、TC2探槽微地貌实测地形

    a—TC1、TC2探槽附近的地形山影图(红色箭头指示断层走向);b—TC1、TC2探槽附近地质环境图

    Figure  7.  Measured microtopographic topography of TC1 and TC2 trenches in the Cuopuhu section

    (a) Topographic hillshade map near TC1 and TC2 trenches, with red arrows indicating fault orientation; (b) Geological environment map near TC1 and TC2 trenches

    图  8  措普湖段TC1探槽所处地貌环境图

    a—TC1探槽微地貌实测地形图;b—TC1探槽所处的地貌环境图(红色箭头指示断层走向)

    Figure  8.  Geomorphological environment map of TC1 trench in the Cuopuhu section

    (a) Measured microtopographic map of TC1 trench; (b) Geomorphological environment map of TC1 trench, with red arrows indicating fault orientation

    图  9  措普湖段TC2探槽所处地貌环境图

    a—TC2探槽微地貌实测地形图;b—TC2探槽所处的地貌环境图

    Figure  9.  Geomorphological environment map of TC2 trench in the Cuopuhu section

    (b) Measured microtopographic map of TC2 trench; (b) Geomorphological environment map of TC2 trench

    图  10  措普湖段TC1探槽东壁剖面

    a—TC1探槽东壁剖面照片(网格线尺寸为1 m×0.5 m);b—TC1探槽东壁剖面构造填图

    Figure  10.  East wall profile of trench TC1 in the Cuopuhu section

    (a) Photograph of the east wall profile of trench TC1, with grid lines measuring 1 m×0.5 m; (b) Structural mapping of the east wall profile of trench TC1

    图  11  措普湖段TC2探槽东壁剖面

    a—TC2探槽东壁剖面照片(网格线尺寸为1 m×1 m);b—TC2探槽东壁剖面构造填图

    Figure  11.  East wall profile of trench TC2 in the Cuopuhu section

    (a) Photograph of the east wall profile of trench TC2, with grid lines measuring 1 m×1 m; (b) Structural mapping of the east wall profile of trench TC2

    图  12  理塘-义敦断裂措普湖段古地震事件综合判别图

    Figure  12.  Comprehensive discrimination map of paleoseismic events in the Cuopuhu section of the Litang-Yidun fault

    表  1  理塘-义敦断裂(措普湖段)主要断错地貌位错量一览表

    Table  1.   Overview of the main fault scarps and displacement amounts along the Litang-Yidun fault (Cuopuhu section)

    序号 位移点位置/(°) 位移量/m 被断错的地质体
    经度 纬度 水平 垂直
    1 99.6085 30.4607 21±3 0.4 拉隆公玛沟口东冲洪积扇侧缘
    2 99.5886 30.4749 6.8 0.7 章德北东山前冲洪积扇上一纹沟
    3 99.5878 30.4745 8 - 章德北东山前冲洪积扇上一纹沟
    4 99.5235 30.5022 8.8 1.3 措普湖东边冰碛台地上一冲沟
    5 99.5533 30.4824 53±4 48±4 - 措普湖南东冰碛垄和冰水垄岗侧缘
    6 99.5279 30.5014 76±10 措普湖西山前冰碛扇侧缘
    7 99.4435 30.5422 - 2 别宗隆洼沟西阿冬山前冲洪积扇
    8 99.4424 30.5421 - 2.5 别宗隆洼沟西阿冬山前冲洪积扇
    9 99.4410 30.5424 - 2~3 别宗隆洼沟西阿冬山前冲洪积扇上断层陡坎高约2~3 m
    10 99.4405 30.5430 - 3 别宗隆洼沟西阿冬山前冲洪积扇
    11 99.4379 30.5430 - 3~4 别宗隆洼沟西阿冬山前冲洪积扇
    12 99.4368 30.5434 - 2 别宗隆洼沟西阿冬山前冲洪积扇
    13 99.4365 30.5434 - 3 别宗隆洼沟西阿冬山前冲洪积扇
    14 99.4357 30.5434 - 2.5 别宗隆洼沟西阿冬山前冲洪积扇
    15 99.4351 30.5436 - 1 别宗隆洼沟西阿冬山前冲洪积扇
    16 99.4926 30.5308 - 2~3 章柯河北岸陡石山前冲洪积扇
    17 99.4943 30.5300 - 3 章柯河北岸陡石山前冲洪积扇
    18 99.4966 30.5290 - 2 章柯河北岸陡石山前冲洪积扇
    下载: 导出CSV

    表  2  措普湖段(F3)探槽内及拉隆公玛沟口东冲洪积扇侧缘壁14C样品数据

    Table  2.   14C sample data from trenches within the Cuopuhu section (F3) and the sidewall of alluvial fan at the east margin of the Lalonggongma gully

    实验室编号 样品编号 样品描述 物质 碳峰值/ % 常规年龄/ a B.P. 95.4%(2σ)标准年龄/ Cal a B.P. 68.2%(2σ)标准年龄/ Cal a B.P.
    LUG12-153 CPTC1-1 黄褐色古土壤 散装有机物 89.84±0.57 861±44 689~907 700~898
    LUG12-154 CPTC1-2 黄褐色古土壤 散装有机物 92.69±0.63 610±47 539~662 553~650
    LUG12-155 CPTC1-3 黄褐色古土壤 散装有机物 92.57±0.59 620±44 543~663 556~653
    LUG12-156 CPTC1-4 黄褐色古土壤 散装有机物 68.46±0.51 3044±51 3079~3371 3172~3343
    LUG12-157 CPTC2-1 黄褐色古土壤 散装有机物 69.78±0.57 2891±69 2852~3245 2927~3256
    LUG12-158 CPTC2-2 黄褐色古土壤 散装有机物 51.50±0.45 5332±60 5948~6227 6002~6192
    LUG12-160 CPLL-1 灰褐色古土壤 散装有机物 75.40±0.35 8120±70 7860~8356 8532~8786
    下载: 导出CSV
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  • 收稿日期:  2023-04-20
  • 修回日期:  2024-02-28
  • 录用日期:  2024-03-13
  • 预出版日期:  2024-03-21
  • 刊出日期:  2024-04-28

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