地震剖面记录的柴达木盆地西部地区新生代构造变形特征  

Cenozoic tectonic deformation characteristics of western Qaidam Basin inferred by seismic profile

作　　者：王亚东[1] 张涛[2] 李仕远[3] 郑建京[1] 郭建明[1] 孙国强[1] 

机构地区：[1]中国科学院油气资源研究重点实验室,兰州730000 [2]兰州大学西部环境教育部重点实验室,兰州730000 [3]中国石油天然气股份有限公司青海油田分公司勘探开发研究院,甘肃敦煌736202

出　　处：《世界地质》2011年第2期213-223,共11页World Geology

基　　金：中国科学院知识创新工程青年人才类重要方向项目(KZCX2-EW-QN112);中国科学院油气资源研究重点实验室开放基金(KFJJ2010-07);中国科学院"西部之光"人才培养计划项目;国家自然科学基金委重大国际合作基金项目(40920114001)联合资助

摘　　要：柴达木盆地被昆仑山、阿尔金山和祁连山围限,新生代盆地发育受周边山体隆升的控制。柴西地区是整个盆地内构造最复杂的地区,形成了NWW和NEE走向的两套断裂体系,地震剖面上明显发育生长地层。为研究柴西地区构造运动模式及期次与周边山体及断裂活动之间的关系,基于该区主干地震剖面的最新解译成果,对剖面中的断裂及生长层序进行分析。确定柴西地区新生代活动断裂集中在3个时期,分别控制不同生长层序的发育:早期活动的断层控制生长层序1的发育(TR～T3,53.5～31.5 Ma),晚期活动断层控制生长层序2的发育(T 2～现今,14.9～0 Ma),新生代以来一直活动的断层也控制着一套生长层序。区内构造演化主体方向由昆仑山和阿尔金山前不断向盆内扩展并共同调节构造展布方向。Qaidam Basin is confined by Kunlun,Altyn Tagh and Qilian mountains,and the Cenozoic basin development is controlled by the uplift of surrounding mountains.Weastern Qaidam Basin is the most complex area in the basin,where there are two fault systems in NWW and NEE trends and developed growth strata in seismic profiles.To study the relationship between the tectonic model and stages of western Qaidam Basin with the activity of surrounding mountains and faults,the authors analyze the faults and growth sequences based on the new interpretation results of main seismic profiles.It is confirmed that the Cenozoic active faults concentrated in three periods and controlled the development of different growth sequences in western Qaidam Basin： the early active faults controlled the development of the growth sequence 1（TR～T3,53.5～31.5 Ma）,the later active faults controlled the growth sequence 2（T＇2～present,14.9～0 Ma）,and the faults have been active since Cenozoic controlled another set of growth sequence.The main regional direction of tectonic evolution expanded from the Kunlun and Altyn Tagh mountains to the innter basin and regulated the direction of structure distribution.

关 键 词：柴西地区 断裂体系 生长层序 构造变形 

分 类 号：P546[天文地球—构造地质学]