【摘要】 郯庐断裂带太湖段位于东大别的东侧,为东大别与山前盆地的构造界线,遥感影像上断层线性特征清晰。在太湖-桐城一带开展了多次野外地质调查和探槽工作,其中太湖小池镇殷家上屋探槽显示,断层带发育有较软的断层泥,断层向上延伸入中更新世棕红色蠕虫状亚粘土中,OSL和ESR样品测试结果表明,断层在中更新世有过较强的活动。桐城挂车河镇洪老屋断层剖面显示断层错断了早中更新世砾石层,断层下部发育有新鲜的断层泥,ESR样品测试结果同样表明断层在中更新世有过较强活动。综合分析认为,郯庐断裂带太湖段在早中更新世仍有过较强活动,最新活动时代为中更新世(Q2),这或是该地区地震活动以中小地震为主的一个构造背景因素。更多还原

【Abstract】 The Taihu segment of the Tanlu fault zone lies on the east side of the Dabie mountains.It is the tectonic boundary between the Dabie mountains and the foreland basin,and the linear features of the faults are clear on remote sensing images.Geological surveys and trench work were carried out in the Taihu-Tongcheng area.In the Taihu trough we find a soft fault gouge in the fault zone,and the fault extends upward into the middle Pleistocene clay.Test results of OSL and ESR show that faults have strong activity in the middle Pleistocene.The fault profile of the Honglaowu in Tongcheng shows that the fault has broken the early Pleistocene gravel layer,and the fault gouge developed in the lower part of the fault.ESR sample test results also show that the fault has a strong activity in the middle Pleistocene.According to comprehensive analysis,it is concluded that the Taihu segment of the Tanlu fault zone still has a strong activity in the early Pleistocene,and the latest activity is the middle Pleistocene(Q2),which is a tectonic background factor mainly composed of small and medium-sized seismic activity in the study area.更多还原