摘要
通过对乌当断裂野外实际构造地貌、地质特征调查,室内断层物质测年分析,结合地球物理、化学探测方法,对乌当断裂的重点地段进行了研究,分析了该断裂第四纪以来的活动特征。初步研究表明,乌当断裂带为倾向SE的逆断层,第四纪以来有不同强度的活动。经断层泥物质测年及综合地貌特征分析,发现该断裂为一条第四纪早更新世弱活动,中更新世强活动的断裂。断层泥物质电子自旋共振测年(ESR)年龄在647~737ka之间,表明乌当断裂在第四纪中更新世早期有活动。
Through the field investigation of tectonic landform, geological characteristic and the gouge dating analysis on Wudang Fault in Guiyan, combing with the geophysics and geochemistry detecting method, we study the key segment of Wudang Fault and analyze the movement characteristic of it from Quaternary Period. The results show that Wudang Fault is a reversed fault which trends to the northwest and dips to southeast, and has various movements in different intensity from Quaternary Period. It moved weakly in the Early Pleistocene and moved strongly in the Middle Pleistocene during Quaternary Period by means of fault gouge dating and analyze of comprehensive geomorphic feature. The ESR dating of fault gouge ranges from 647 ka to 737 ka, which suggests that the fault is active in the Middle Pleistocene during Ouaternarv Period.
出处
《地震研究》
CSCD
北大核心
2012年第2期213-219,295,共7页
Journal of Seismological Research
基金
中国地震局地震研究所基金(IS200856069)资助
关键词
贵阳
乌当断裂
第四纪活动
断层泥测年
地球物理、化学探测
Guiyang
Wudang Fault
Quaternary Period activity
fault gouge dating
geophysics andgeochemistry detecting