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根据野外地质、地貌调查结果,重点论述了德钦—中甸—大具断裂的几何展布、运动性质和最新活动时代。该断裂多处断错了晚更新世及全新世地层,具明显的右旋走滑兼正断性质,最新活动时代为晚更新世至全新世,水平滑动速率为1.7~2.0 mm/a,垂直滑动速率为0.6~0.7 mm/a。该断裂是川滇菱形块体西北边缘的一条重要的NW向走滑断裂,它与金沙江断裂带一起,共同构成了川滇菱形块体西北边界。
According to the results of field geology and geomorphology survey, the paper focuses on the geometric distribution of Deqin-Zhongdian-Dadu fault, the nature of the movement and the era of the latest activities. The faults have faults in the Late Pleistocene and Holocene strata at many places with obvious dextral strike-slip and normal-fault properties. The latest activity was from Late Pleistocene to Holocene with a horizontal slip rate of 1.7-2.0 mm / a, vertical slip The rate is 0.6 ~ 0.7 mm / a. The fault is an important NW strike-slip fault at the northwest edge of the Sichuan-Yunnan rhombic block. Together with the Jinshajiang fault zone, it constitutes the northwestern boundary of the Sichuan-Yunnan rhombic block.