【摘要】 通过地质调查、联合钻孔勘察、断层露头剖面实测、光释光年龄测试等综合手段,对口泉断裂郊城段准确位置、断裂展布特征和活动性进行详细研究。结果表明,断裂在该地段由2条断裂组成,呈平行阶梯状,间距30m,山区侧断裂断距1.4m,盆地侧断裂断距1.9m,两断裂断至地表属全新世活动断裂,为同期黏滑所致。晚更新世晚期(20.3～27.8ka)地层平均沉积速率约为0.17mm/a。沿断裂无明显的地貌陡坎,基岩山体剥蚀后退400～600m。研究得出的断裂准确位置、展布特征及活动性结果,对口泉断裂形成历史、盆地的形成演化及对沿线工程规划和灾害评估有较大的参考意义。更多还原

【Abstract】 Through comprehensive means such as geological survey,joint borehole investigation,actual measurement of fault outcrop profile and optically stimulated luminescence(OSL)age test,the exact location,fault distribution characteristics and activity of the Jiaocheng section of Kouquan fault are studied in detail.The results show that the fault is composed of two parallel faults in this section,with a distance of 30 m.The fault distance of the mountain side is 1.4 m,and the fault distance of the basin side is 1.9 m.The two faults break to the surface,which belongs to Holocene active fault,is caused by stick slip in the same period.The average sedimentary rate of late Pleistocene(20.3-27.8 ka)formation is about 0.17 mm/a.There is no obvious geomorphic steep ridge along the fault,and the bedrock mountain body is eroded back 400-600 m.The accurate location,distribution characteristics and activity determination of the faults obtained by the study are of great reference significance to the formation history of the Kouquan fault,formation and evolution of the basin and the engineering planning along the line and disaster assessment.更多还原