维西—乔后断裂北段晚第四纪活动的地质地貌表现
投稿时间:2023-06-30  修订日期:2023-09-04  点此下载全文
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作者单位邮编
李鉴林 云南省地震局 650041
常祖峰* 云南省地震局 
阿拉塔 云南省地震局 
基金项目:国家自然科学基金(编号:U2002211)和云南省地震局科技专项基金项目(编号:2022ZLZX01)联合资助。
中文摘要:维西—乔后断裂位于青藏高原与云贵高原接壤西缘,是青藏高原东南缘一条规模较大的活动断裂。研究其新构造活动特征对认识川滇块体构造格局和运动图像具有重要的科学意义。据野外详细的地质地貌调查结果,重点阐述断裂北段的运动特征及其滑动速率。研究表明:白济讯、维西县城及扎你洛等地均发现晚更新世活动的地质证据,有明显的晚第四纪活动迹象;该段运动性质以右旋走滑为主,根据阶地扭曲、陡坎等测得其水平滑动速率为1.0~1.2mm/a,垂直滑动速率为0.3~0.4mm/a。
中文关键词:维西—乔后断裂  晚更新世  滑动速率
 
Geological and Geomorphological Features of Late Quaternary Activity in the Northern Segment of Weixi-Qiaohou Fault
Abstract:The Weixi-Qiaohou fault located at the western border of the Tibet plateau and the Yunnan-Guizhou plateau is a large-scale active fault on the southeast margin of the Tibet Plateau.Studying its neotectonic activity characteristics has great scientific significance on understanding the tectonic framework and motion image of the Chuan-Dian block. According to the detailed field geological and geomorphic investigating results , the movement characteristics and sliding rate of the northern segment of the fault are mainly described in this paper. The research result shows that the geological evidence of late Pleistocene activity has been found at Baijixun, Weixi County and Zhaniluo, indicating that there are obvious indication of late Quaternary activity; this segment movement is mainly dominated by dextral slip,with a horizontal slip rate of 1.0 ~ 1.2mm/a and a vertical slip rate of 0.3 ~ 0.4mm/a according to the terrace distortion and scarps.
keywords:Weixi-Qiaohou fault  Late Pleistocene  slip rate
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