铺前—清澜断裂西支晚更新世活动特征  

Late Pleistocene activities characteristics of western segment of Puqian-Qinglan fault

作　　者：刘风香[1] 苗雨雁 荆振杰[3] 杜海娥[1] LIU Feng-xiang;MIAO Yu-yan;JING Zhen-jie;DU Hai-e(Geological Museum of China,Beijing 100034,China;Beijing Museum of National History,Beijing 100050,China;Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China)

机构地区：[1]中国地质博物馆,北京100034 [2]北京自然博物馆,北京100050 [3]中国地震局地壳应力研究所,北京100085

出　　处：《世界地质》2018年第1期148-153,共6页World Geology

基　　金：国土资源部部门预算项目(121113118902)

摘　　要：海域浅层地震探测调查表明,铺前—清澜断裂向北西海域方向延伸,断裂走向NW-SE,倾向SW,为高倾角的正断层;在地震剖面上,断裂断错了第四系地层;进一步应用钻探技术对铺前—清澜断裂进行探测研究,结合层序地层学、岩性岩相分析与年代测定等方法建立了钻孔联合剖面,揭示断层性质为正断层,倾向SW,断距>4.0 m,断层的最新活动时代为晚更新世,第四纪表现为张性活动,断裂的平均垂直速率为0.15 mm/a。The marine shallow seismic exploration survey shows that Puqian--Qinglan fault extends NW seawards.It is a high angle normal fault striking NW--SE and dipping SW.On the seismic profile,the fault offsets Quaternary strata.Further study is undertaken combining drilling data with sequence stratigraphy,lithofacies analysis and dating,and a geological section across well boreholes is established,which reveals that the fault is a normal fault,dipping SW,and the fault throw is more than 4.0 m.The latest activity of the fault occurred in Late Pleistocene and it was characterized by extensional feature in Quaternary.The average vertical slip rate of the fault is 0.15 mm/a.

关 键 词：铺前—清澜断裂 隐伏活动断裂 晚更新世活动 浅层地震探测 钻探探测 

分 类 号：P534.631[天文地球—第四纪地质学] P546[天文地球—古生物学与地层学]