福建永安-晋江断裂带东南段探槽剖面研究

分析断裂的地表出露特征,对北西向永安-晋江断裂带东南段的隐伏断裂,进行探槽开挖和地层年代学测试。通过对官前主干断裂进行探槽开挖,揭露出北西向官前主干断裂没有向上错断上覆第四系,探槽揭示的最老第四系年龄为距今45.69±3.88 Ka,表明了官前主干断裂在更新世晚期以来已不再活动,为永安-晋江断裂带东南段的断裂活动性研究奠定了可靠基础。

Studies on the Trench Profile of the Southeast Segment of Yongan-Jinjiang Fault Zone, Fujian

Based on the outcrop feature of southeast segment of Yongan-Jinjiang f ault,the buried part of the fault was investigated by the trench excavation and the stratal geochronological test.The trench excavation confirmed that the mai n part of the NE-trending Guanqian fault didn＇t leap the overlying Quaternary st ratum and the age of the oldest Quaternary in the trench was（45.69±3.88）Ka. This concludes that the main Guanqian fault has been not active since Late Pleis tocene epoch.These researches built a solid foundation for study on the activit y of Yongan-Jinjiang fault.