元谋断裂晚第四纪活动性定量分析

卢海峰; 何仲太; 赵俊香; 马保起; 王瑞

元谋断裂晚第四纪活动性定量分析

中国地震局地壳应力研究所, 北京 100085

基金项目:

中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项 ZDJ2007-15

详细信息

作者简介:
卢海峰(1975-), 男, 助理研究员, 从事构造地质、地震地质研究.E-mail: luhf00@sohu.com

中图分类号: P553
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出版历程
- 收稿日期: 2008-04-11
- 刊出日期: 2008-11-25

Quantitative Analysis on Activity of the Yuanmou Fault in Late Quaternary

Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China

摘要

摘要: ETM影像揭示了元谋断裂以左行剪切走滑为主, 局部张剪或压剪的性质.利用1:5万地形图和影像图内冲沟、山脊等地貌位错估测了元谋断裂一平浪-江边段晚第四纪活动性, 详细调查实测并分析了研究区断错地貌和构造剖面, 获取的该断裂晚第四纪活动性、活动强度, 与估测结果一致.结果显示, 元谋断裂一平浪-江边(金沙江边) 段最新活动时间为晚更新世末期-全新世; 其中一平浪-大龙潭一带, 水平滑动速率约2.0mm/a, 垂直滑动速率为0.07mm/a; 木莲旧-秧田井一带, 水平滑动速率接近0.53mm/a, 垂直滑动速率为0.06mm/a; 乐胜古-江边一带, 水平滑动速率接近1.32mm/a, 垂直滑动速率为0.03mm/a.综合分析表明, 该段断裂晚第四纪平均水平滑动速率为1~2.0mm/a, 以走滑运动为主.
- 元谋断裂 /
- 左行剪切走滑 /
- 滑动速率
Abstract: ETM data reveal that the Yuanmou fault is mainly characterized by horizontal left-lateral and shear strike-slip, including ringent shear and pressed shear in part.Taking the advantage of the level moving and offset of the gullies and ridges in 1∶50000 landform and ETM image, we estimated the activity of Yuanmou fault of Yipinglang-Jiangbian segment in the Late Quaternary, and later the results from field exploration, including the analysis of the profiles of landform offsets such as gullies and fluvial landforms, the sections of the active structures in the studied area and activity and active intensity in the Yuanmou fault is the same as what we presumed before.The result shows that the latest active time of the Yuanmou fault of Yipinglang-Jiangbian segment is from the mid-late of Late Pleistocene to Holocene.During these ages, the level moving velocity of left-lateral strike-slip of Yipinglang-Dalongtan segment is approximately 2.0 mm/a, the velocity of uprightness strike-slip approximately 0.07 mm/a.While the respective velocity of left-lateral strike-slip and uprightness strike-slip is approximately 0.53 mm/a and approximately 0.06 mm/a from Yangtianjing to Mulianjiu, the respective velocity of left-lateral strike-slip and uprightness strike-slip approximately 1.32 mm/a and 0.03 mm/a from Leshenggu to Jiangbian.Comprehensive analysis indicates that the level moving velocity since the Late Quaternary in the studied phase is 1~2.0 mm/a, with a major left-lateral shear strike-slip.
- Yuanmou fault /
- left-lateral and shear strike-slip /
- moving velocity

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图 1 元谋断裂区域构造环境

1.全新世断裂; 2.晚更新世断裂; 3.早、中更新世断裂; 4.正断层; 5.逆断层; 6.走滑断裂; 7.断裂名称; 8.第四系; 9.上第三系; 10.河流; 11.震中M=6.0~7.0;12.震中5.0~6.0;13.震中4.0~5.0;14.重点研究区间.F1.普渡河-滇池断裂带; F2.汤郎-易门断裂带; F3.禄丰断裂带; F4.元谋-绿汁江断裂带: F4-1.元谋断裂, F4-2.昔格达断裂; F5.楚雄断裂; F6.磨盘山断裂; F7.则木河断裂; F8.越西断裂; F9.小江断裂; F10.宁会断裂

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图 2 元谋断裂遥感影像及晚第四纪滑动速率参数分布

a.元谋-一平浪断裂影像; b.舍资-带断错地貌; c.羊街-化同一带盆地与断错地貌; 逗号前数据为水平速率, 后为垂直速率, 单位mm/a

Fig. 2. Yuanmou fault remote sensing image and distribution of moving-velocity parameters in Late Quaternary

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图 3 元谋断裂带舍资盆地西缘山脊及冲沟水平位错

Fig. 3. Level offset of gullies and ridges of the Yuanmou fault among Western margin of the Shezi basin

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图 4 元谋断裂带山脊及冲沟水平位错

Fig. 4. Level offset of gullies and ridges of the Yuanmou fault

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图 5 化同、羊街盆缘断错冲沟影像图

Fig. 5. ETM picture showing gullies offset image of the Yuanmou fault among the margins of Huatong basin and Yangjie basin

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图 6 上中西屯东断裂活动平面图

1.第四纪I级阶地冲积物; 2.第四纪坡洪积物; 3.前第四纪基岩; 4.散乱滚石; 5.断裂及走滑方向; 6.断裂陡坎; 7.断裂倾向; 8.河流方向; 9.取样点位置

Fig. 6. Plan map of fault action in eastern Shangzhongxitun

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图 7 大岔路西断裂剖面及断裂错断河流阶地示意图

T1. I级阶地: T2. II级阶地; ①堆积阶地; ②侵蚀、堆积阶地; ▲. 取样位置; F.断裂

Fig. 7. Map showing fault section and offset fluvial land-forms around western Dachalu

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图 8 构造平面图及断面擦痕

Fig. 8. Structural plan map and scrapes on the surface of the fault

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图 9 秧田坝西崩积楔剖面图及断层地貌

①分选、磨圆极差的崩积体; ②偶见磨圆度较好的堆积体; ③坡积土层; ▲.取样位置

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图 10 那能村东断裂及地貌

a.断裂剖面; b.擦痕; c.断裂地貌; ①冲洪积物; ②风化紫褐色泥层; ▲.采样点

Fig. 10. The fault and physiognomy in eastern Naneng

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图 11 那能村南河流阶地图

TI. I级阶地; T2. II级阶地; ▲采样点

Fig. 11. Map showing fluvial landform around southern Nanengcun

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图 12 下雷弄村北断裂剖面

①含现代根系坡积物; ②含砾砂层; ③砂砾层; ④含砾砂层; ⑤砂层; ▲.取样点

Fig. 12. Yuanmou fault section around northern Xialeinong

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图 13 白泥湾村断裂剖面

①全新世坡洪积物; ②晚更新世冲洪积物; ③强风化成泥的紫红色侏罗纪砂岩层; ▲.取样点

Fig. 13. Yuanmou fault section around Bainiwan

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表 1 元谋断裂一平浪-金沙江边晚第四纪活动特征

Table 1. Active characteristics of the Yuanmou fault around the phase from Yipinglang to Jiangbian in Late Quaternary

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