塔里木盆地东南缘新生代构造变形特征研究  

Research of Cenozoic structural deformation in southeastern Tarim basin,northwest China.

作　　者：程晓敢[1,2] 廖林[1,2] 陈汉林[1,2] 陈立锋[1,2] 杨树锋[1,2] 王步清[3] 肖中尧[3] 罗俊成[3] 

机构地区：[1]浙江大学地球科学系,杭州310027 [2]教育部含油气盆地构造研究中心,杭州310027 [3]中石油塔里木油田分公司,新疆库尔勒841000

出　　处：《岩石学报》2008年第4期645-654,共10页Acta Petrologica Sinica

基　　金：国家重点基础研究发展规划(973)项目(2007CB411303);国家自然科学基金(40672149;40472120)项目资助.

摘　　要：塔里木盆地东南缘新生代变形特征研究对探讨阿尔金构造带新生代的活动特征及阿尔金构造带与西昆仑构造带的相互作用具有重要意义。本文在野外地质调查的基础上,结合地球物理和沉积学资料,探讨了塔里木盆地东南缘的新生代变形及演化特征。塔里木盆地东南缘新生代构造变形受西昆仑构造带、阿尔金构造带和车尔臣断裂带的控制,且变形由西向东减弱。西南部的构造样式主要表现为受西昆仑向北冲断作用控制的冲断构造;东南部为受阿尔金断层走滑作用控制的走滑-冲断构造;而北部则为受车尔臣断层走滑作用控制的基底卷入走滑-冲断构造。中新世,盆地东南缘受西昆仑构造带大规模的冲断活动影响,导致民丰山前盆地挠曲沉降和冲断层发育,而车尔臣断裂仅有微弱活动;上新世开始,构造变形扩展到整个研究区,不仅西昆仑构造带和车尔臣断裂带表现出强烈变形,而且阿尔金断层走滑作用强烈,导致北侧次级断层的强烈走滑冲断作用和若羌山前挤压挠曲盆地的形成。新生代时期,西昆仑构造带北向冲断作用要早于阿尔金构造带的走滑变形,阿尔金构造带的走滑作用对西昆仑构造带北向冲断构造有强烈的改造。It is very important to study the Cenozoic deformation of Southeatern Tarim basin, which helps discussing the Cenozoic characteritics of Atlyn Tagh tectonic belt and the relationship between West Kunlun tectonic belt and Altyn Tagh tectonic belt. Combining with geophysical and sedimentlogical data, it discussed the characteristics and spatio-temporal variation of the Cenozoic structural deformations of the Southeastern Tarim. The deformations of the Southeastern Tarim are controlled by West Kunlun tectonic belt, Altyn tectonic belt and Cherchen strike-slip falut belt. The starting time of the deformations becomes earlier from north to south. In the southwest part, the deformation style shows as thrust structure which is controlled by the northward thrusting of West Kunlun tectonic belt. and in the southeast part, the deformation style shows as strik-slip thrsut structure which is controlled by the Altyn Tagh Fault strike-sliping; while in the north part, the deformation style shows as basement involved strik-slip thrsut structure which is controlled by the Cherchen fault strike-sliping. The basin in Minfeng area began to flex and subside due to the West Kunlun tectonic belt thrusted on a large scale, while the Cherchen fault show weak activity during Miocene. The deformations were spread all over the southeatern Tarim basin during Pliocene. The thrust and slip of the West Kunlun and the Cherchen had greatly strengthened up, at the same time, the slipping of Altyn fault zone was violent. Therefore, sub-faults strongly thrusting-sliping at north side of Altyn Tagh Fault zone and the basin in Ruoqiang area was shaped. The thrust of West Kunlun tectonic belt is earlier than the slip of Altyn Tagh tectonic belt. So the slipping of later reworked the thrust deformation of West Kunlun.

关 键 词：构造变形 新生代 塔里木盆地东南缘 西昆仑构造带 阿尔金构造带 

分 类 号：P542[天文地球—构造地质学]