RECENT ACTIVE FEATURES OF WEIXI-QIAOHOU FAULT AND ITS RELATIONSHIP WITH THE HONGHE FAULT
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摘要: 根据野外调查结果，重点阐述了维西-乔后断裂晚第四纪活动特征，并对其与红河断裂之间的关系进行了探讨分析。维西-乔后断裂对晚新生代盆地具有明显的控制作用，右旋走滑特征明显，沿线山脊和河流表现为同步右旋位错。德胜和长邑南探槽揭示其断错了晚更新世晚期-全新世堆积。岩曲-石岩村一带Ⅱ级河流阶地和后缘洪积扇上发育长约3 km、高2.5 m左右的断层陡坎。根据洪积扇、冲沟和河流阶地位错量估算，该断裂晚更新世晚期以来右旋水平滑动速率为1.8~2.4 mm/a，垂直滑动速率为0.30~0.35 mm/a。它南与红河断裂相连，北与金沙江断裂相接，新生代以来具有与红河断裂和金沙江断裂相似的运动学特征、相同的地质演化历史和构造变形机制，是红河活动断裂的北延部分。维西-乔后断裂与红河、金沙江以及德钦-中甸-大具等断裂一起，共同构成了川滇活动块体的西部边界。Abstract: According to geological and geomorphic field observations, in this paper, we mainly elaborate the late Quaternary active features of the Weixi-Qiaohou fault, and discuss its relationship with the Honghe fault. The fault have apparently dominated many late Cenozoic basins' development, showing dextral strike slip motion features as being documented by synchronous right-lateral dislocation of mountain ridges and rivers along it. It has displaced late Pleistocene to Holocene accumulations revealed by the exploratory trenches at Desheng and the site south of Changyi. Nearby Yanqu and Shiyan, there is a 3 km long, ~2.5 m high fault scarp on the river terraces and the alluvial fans. It is estimated the fault has a average rate of 1.8~2.4 mm/yr. horizontally and 0.3~0.35 mm/yr. vertically since late Pleistocene, based on displaced magnitude of the alluvial fans, gullies and river terraces. It is a significant link which connects with the Honghe fault in the south and with the Jingshajiang fault in the north. Since late Cenozoic, the Weixi-Qiaohou fault in kinematics is similar to the Honghe fault and the Jinshajiang fault, they having identical geological evolutionary history and tectonic deformation mechanism, accordingly, indicating that the Weixi-Qiaohou fault should be the northern segment of the Honghe fault. The Weixi-Qiaohou, Honghe, Jinshajiang as well as Deqin-Zhongdian fault composed of the western boundary of Sichuan-Yunnan active block all together.
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Key words:
- Weixi-Qiaohou fault /
- Sichuan-Yunnan block /
- Late Quaternary /
- dextral strike slip /
- slip rate
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图 2 维西—乔后—巍山断裂及邻区构造图
①—维西—乔后—巍山断裂；②—金沙江断裂；③—龙蟠—乔后断裂；④—玉龙山西麓断裂；⑤—玉龙山东麓断裂；⑥—丽江断裂；⑦—鹤庆断裂；⑧—红河断裂；⑨—兰坪—云龙断裂；⑩—澜沧江断裂
Figure 2. A map of the structures in Weixi-Qiaohou-Weishan fault and its adjacent area
图 5 玉水坪小溪同步右旋位错地貌
Figure 5. Synchronous right-lateral displacing landforms of rivers at Yushuiping
图 6 玉水坪Ⅱ级阶地断层素描图
1-灰褐色壤土; ②-褐黄色含砂砾石(磨圆度较好); ③-灰黄色粉砂; ④-深灰色半固结黏土; ⑤-深灰色砾石层
Figure 6. he sketch map of the faults on the second terrace at Yushuiping
图 7 下甸—玉狮场串珠状第四纪盆地
Figure 7. Beaded Quaternary basins developed from Xiadian to Yushichang
图 8 德胜村探槽SE壁剖面素描图
①—褐红色含砾石细砂；②—灰白色含砾石、粉砂黏土；③—灰白色砂质黏土；④—褐红色黏土；⑤—片理化带
Figure 8. The SE wall profile of the exploratory trench at Desheng village
图 9 长邑南探槽NW壁剖面素描图
①—棕色含砂壤土；②—黄褐色含卵石砂土；③—深灰色含卵石黏土；④—黑色含卵石泥炭质土；⑤—灰黑色含卵石粘土；⑥—灰黄色含砾石粉砂；⑦—灰黑色含砂黏土及片理化带
Figure 9. The NW wall profile of the exploratory trench south of Changyi
图 10 岩曲村西断层陡坎及洪积扇右旋位错
Figure 10. The fault scarp and right-lateral dislocation of alluvial fans at west of Yanqu village
图 11 石岩村北西1 km处阶地与冲沟位错图
Figure 11. The displacing map of terraces and gullies at 1 km northwest of Shiyan village
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