Slip Rate of Lijiang-Xiaojinhe Fault in the Holocene
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摘要: 丽江-小金河断裂与锦屏山断裂共同控制着青藏高原东南边界，研究该断裂的滑动速率有助于理解青藏高原东南缘区域变形模式。本文通过高分辨率遥感影像解译与野外地质调查，发现该断裂错断了一系列河流阶地与洪积扇，且以左旋走滑为主兼具倾滑分量。通过无人机断错地貌测量与碳同位素断代，获得红星-尖山营断裂段全新世左旋走滑速率为（3.32±0.22）mm/a，垂直滑动速率为（0.35±0.02）mm/a；汝南-南溪断裂段北支全新世左旋走滑速率为（2.37±0.20）mm/a。Abstract: The Lijiang-Xiaojinhe fault jointed with the Jinpingshan fault control the southeastern boundary of the Qinghai-Tibet Plateau. The study on the activity of the Lijiang-Xiaojinhe fault is of great significance for understanding the deformation mode of the southeastern margin of the Qinghai-Tibet Plateau. Interpretation of high-resolution remote sensing images and field geological surveys revealed that the faults have offset a series of river terraces and alluvial fans,with a left-lateral strike-slip and a small amount of tilt-slip. Through the fault geomorphology measurement by UAV and the age determination by carbon isotope dating,we estimated that the left-lateral strike-slip rate of in the Hongxing-Jianshanying fault segment since the Holocene is about 3.32±0.22 mm/a,and the vertical slip rate is about 0.35±0.02 mm/a,and the left-lateral strike-slip rate of the northern branch of the Runan-Nanxi fault segment since the Holocene is about 2.37±0.15 mm/a.
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图 2 丽江-小金河断裂平面图(Google Earth影像)
Figure 2. Spatial distribution of Lijiang-Xiaojinhe fault (after Google Earth image)
图 3 丽江-小金河断裂沿线冲沟位错
Figure 3. Deflections of gullies across the Lijiang-Xiaojinhe fault
图 4 断错位移量测量误差示意(Gold等, 2011)
Figure 4. Schematic diagram of measurement error of fault
图 5 旦读村被左旋错断的冲沟
(a) Google Earth影像(箭头为断层槽谷); (b)无人机航拍影像
Figure 5. Left laterally gully offset across the fault near Dandu village
图 7 尖山营左旋错断的冲沟
Figure 7. Left laterally gully offset across the fault near Jianshanying village
图 8 尖山营错断河流阶地与冲积扇
Figure 8. Offsets of river terraces and fans near Janshanying village
表 1 无人机现场作业参数
Table 1. UAV field operation parameters
编号 位置 飞行高度/m 照片数 图像面积/km2 点云密度/m3 图像分辨率/cm 航向重叠率/% 旁向重叠率/% 1 旦读 90 214 1.05 8.91 6.61 80 65 2 尖山营 70 50 0.21 20.3 5.13 80 65 
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