天山后峡盆地晚中生代反冲断层的发现及其地质意义  

Late Mesozoic back thrusts in Houxia basin within Tianshan orogeny, Xinjiang, China and its geological implications

作　　者：李丽[1] 陈正乐[1] 蒋荣宝[1] 陈柏林[1] 鲁克改[2] 王果[2] 郑恩玖[2] 黄以[2] 王国荣[2] 李细根[2] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]核工业216地质大队,新疆乌鲁木齐830001

出　　处：《地质通报》2008年第12期2097-2103,共7页Geological Bulletin of China

基　　金：国家重点基础研究发展计划“973”项目(编号:2007CB411305 和 2001CB409808)资助。

摘　　要：天山山脉是通过古生代陆壳增生和晚古生代陆-陆碰撞形成的,新生代又受到强烈的陆内挤压隆升与褶皱断裂作用的改造,但对天山造山带中生代的构造变形特征知之甚少。在北天山后峡盆地发现一系列北倾南冲的逆冲推覆构造,根据区域地质资料推测应属于晚中生代的反冲断层。区域资料,特别是磷灰石裂变径迹测试结果表明,天山造山带在中生代晚期经历了一次重要的构造隆升事件,后峡盆地的反冲构造就属于该期山脉隆升事件的构造表现。这对进一步认识天山造山带中生代的构造演化和印度-亚洲大陆碰撞对该地区的远程效应有重要意义。Tianshan has been produced by Paleozoic crustal accretion in combination with continental-continental collision during Late Paleozoic, in addition, it has widely recognized that Tianshan has been reworked by Cenozoic intracontinental deformation, however, tectonic deformation characteristics of Tianshan orogeny has been poorly understood. A series of north-dipping thrust faults identified have been recognized to be backthrust faults which took place in Late Mesozoic according to regional geology. Apatite fission track dating results suggest Tianshan orogeny went through a significant tectonic uplifting event in Late Mesozoic which has been expressed by backthrust faults in Houxia basin, this tectonic event plays significant role in further understanding the Mesozoic tectonic evolution of Tianshan orogeny, as well as far-field effects resulting from Indo-Eurasian collision.

关 键 词：天山造山带 后峡盆地 反冲断层 晚中生代 

分 类 号：P54[天文地球—构造地质学]