河西走廊西段及邻区主要断裂(一)——晚新生代逆断层与走滑断层的地震剖面解释  

ON FAULTS OF WESTERN HEXI CORRIDOR AND ITS VICINITY, NORTHWESTERN CHINA I: THRUST AND STRIKE-SLIP FAULTS OF LATE CENOZOIC

作　　者：何光玉[1] 杨树锋[1] 陈汉林[1] 肖安成[1] 韩永科[2] 李建立[2] 刘昱[3] 高军良[3] 

机构地区：[1]浙江大学地球科学系,中国杭州310027 [2]玉门油田,中国甘肃玉门735000 [3]河南油田,中国河南南阳473132

出　　处：《地震学报》2004年第6期601-608,共8页Acta Seismologica Sinica

基　　金：国家"十五"科技攻关项目 (2 0 0 1BA6 0 5A0 6A);中石油技术开发项目 (Y2 0 0 1JF)联合资助

摘　　要：基于地震剖面解释的构造分析表明 ,河西走廊西段及邻区发育有许多晚第三纪 第四纪的逆断层与走滑断层 .其主要类型有两种 :一是与北祁连逆冲推覆作用有关的南倾逆断层 ,其走向北西 ,主要分布于北祁连山东北缘及河西走廊西南部地区 ;二是与阿尔金断裂活动有关的逆断层与走滑断层 ,主要分布于红柳峡、宽台山—合黎山地区 .这些断层与新生代始新世末期以来印 藏碰撞的远距离效应有关 .它们于晚第三纪开始活动 ,主要活动于第四纪时期 ,而且大多目前仍在活动 ,属于活动性断层 ,是河西走廊地区地震的潜发因素 .此外 ,它们还造成了地层的强烈变形 ,形成了一系列的地貌阶地和河流的水平错移 .The structural analysis based on the explanation of seismic profiles indicates that a lot of thrust faults and strike-slip faults of Late Cenozoic occur in western Hexi Corridor and nearby regions. They can be divided into two types. One is the thrust faults dipping south ward and extending northwest ward, which was mainly correlated with the thrusting of northern Qilianshan and located at the northeast margin of Qilianshan and the southeastern Hexi Corridor, the other is the thrust faults and strike-slip faults that were related to the strike-slipping of Altun fault and located mainly at the regions of Hongliuxia, Kuantaishan, and Helishan that are close to the Altun fault. All these faults, which were related to the remote effects of collision between the two continents of India and Tibet during the Late Eocene and later, started to develop since the Late Tertiary and presented the features of violent thrust or strike-slip movement in Quaternary. Many of them are still active up to now and thus belong to the active faults that are the potential inducement of earthquakes in the Hexi Corridor. Moreover, a lot of intense structural deformation and many morphology phenomena such as tectonic terrace and river offset were formed under the control of these faults in Quaternary.

关 键 词：逆断层 走滑断层 地震 河西走廊 

分 类 号：P315.2[天文地球—地震学]