Geomorphological Features of the South and Middle Sections of Lijiang-Xiaojinhe Fault and Their Tectonic Significance
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摘要: 丽江-小金河断裂位于青藏高原东南缘，是川滇菱形块体内重要的次级边界断裂。构造活动对区域河流水系的发育有重要影响，因此，定量研究水系地貌特征可在一定程度上反映区域内构造活动信息。本文采用地形坡度、地形起伏度、面积-高程积分值（HI）等地貌参数研究沿该断裂区域地貌对构造活动的响应。研究发现，断裂北侧坡度和地形起伏度较断裂南侧高，跨断裂4级流域盆地内亚流域盆地面积-高程积分值变化也指示断裂北侧流域成熟度低于断裂南侧，这反映了丽江-小金河断裂存在一定逆冲分量。Abstract: Lijiang-Xiaojinhe fault is located on the southeastern margin of the Tibet Plateau and is an important secondary boundary fault in the Sichuan-Yunnan rhomboid block. Tectonic activity has an important impact on the development of regional river systems. Therefore, quantitative research on the geomorphological characteristics of river systems can reflect information on tectonic activities in the region. In this paper, topographic gradients, topographic relief, area-elevation integral (HI value) and other geomorphic parameters are used to study the response of the geomorphology along the fault to tectonic activity. The study shows that the slope and terrain relief on the north side of the fault are higher than that on the south side. The extracted small watershed area-elevation integral value shows that the watershed maturity on the north side of the fault is lower than the south side of the fault, which reflects the existence of thrust component of the Lijiang-Xiaojinhe fault.
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Key words:
- Lijiang-xiaojinhe fault /
- Slope /
- Local relief /
- HI value /
- Tectonic activity
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图 1 研究区域构造图
(a)川滇菱形块体及其邻区构造纲要图；(b)地貌参数分析范围
Figure 1. Regional structure map of the study area
图 4 研究区域内亚流域盆地HI分布
Figure 4. Distribution of HI value of sub-level basins in the study area
图 5 跨断裂4级流域盆地内HI变化
Figure 5. Changes of HI value in fourth-level basins across the fault basins
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