东南天山焉耆盆地洪水沟断裂晚第四纪活动特征及构造意义  

Late Quaternary Activity Characteristics and Tectonic Significance of Hongshuigou Fault in Yanqi Basin,Southeast Tianshan Mountain

作　　者：殷娜[1,2] 付国超 孙晶岩 王艳萍[1] YIN Na;FU Guochao;SUN Jingyan;WANG Yanping(Institute of Disaster Prevention,Sanhe 065201,China;Hebei Key Laboratory of Earthquake Dynamics,Sanhe 065201,China;Institute of Geophysics,China Earthquake Administration,Beijing 100010,China;Tianjin Earthquake Agency,Tianjing 300201,China)

机构地区：[1]防灾科技学院,河北三河065201 [2]河北省地震动力学重点实验室,河北三河065201 [3]中国地震局地球物理研究所,北京100010 [4]天津市地震局,天津300201

出　　处：《防灾科技学院学报》2021年第4期50-57,共8页Journal of Institute of Disaster Prevention

基　　金：中央高校基本科研业务费专项(ZY20180204);河北省地震动力学重点实验室项目(FZ202207);国家重点研发计划(2019QZKK0901)。

摘　　要：对焉耆盆地内部洪水沟断裂晚第四纪构造变形的几何学与运动学特征进行了研究。野外地质地貌调查发现,洪水沟断裂整体呈NW-SE走向,倾向NE,晚第四纪以来构造变形强烈,曾发生过一次震级约7.0级的古地震事件,形成长约25km的地表破裂。断裂断错地貌清楚,沿走向发育断层槽谷、连续陡坎与冲沟右旋等地貌,并控制开都河的分布和流向,表现出以右旋走滑为主兼逆冲的运动学性质。研究发现尽管天山是一个以逆冲缩短变形为主的造山带,但山间盆地中晚第四纪的走滑剪切也参与了天山内部的构造变形调节与分配过程。The geometrical and kinematic characteristics of the Late Quaternary tectonic deformation of the Hongshuigou fault in Yanqi Basin are studied.As the field geological and geomorphic survey shows,the strike of Hongshuigou fault is NW-SE,and the tendency of it is NE.Since the Late Quaternary,the tectonic deformation of the Hongshuigou fault has been strong,and a paleo-seismic event with a magnitude of 7.0 occurred on it,which resulted in the forming of a surface rupture with a length of about 25 km.In addition,the geomorphology of fault is clear,and along the strike of it developed trough valleys,fault scarps and dextral gullies,which control the distribution and flow direction of the Kaidu River,showing the kinematics of dextral strike-slip and thrust.The results show that although Tianshan Mountain is an orogenic belt dominated by thrust shortening deformation,the Late Quaternary strike-slip shearing in the intermountain basin also participated in the adjustment and distribution of tectonic deformation of Tianshan.

关 键 词：焉耆盆地 洪水沟断裂 晚第四纪 活动特征 天山 

分 类 号：P315.23[天文地球—地震学]