塔里木盆地巴楚隆起古董山断裂带构造分析  

Structural analyses of the Gudongshan fault belt in the Bachu rise,Tarim Basin

作　　者：师骏[1] 李曰俊[2] 桑洪[1] 曾昌民[1] 文磊[2] 张强[2] 冯晓军[1] 姜红[1] 梁华[1] 贾铁干 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质科学》2014年第3期935-946,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项"全球重点大区石油地质特征与油气分布规律"课题(编号:2011ZX05028-003);塔里木油田资助

摘　　要：古董山断裂构造带位于塔里木盆地西部的巴楚隆起上,走向北西—南东,延伸140 km左右。基于地震剖面的详细解释,识别出4期构造变形:寒武—奥陶纪正断层、二叠纪正断层、中新世冲断层、上新世—更新世冲断层及其伴生的正断层。中新世基底卷入型冲断层是古董山构造带的主控断裂构造,构成断裂带的主体,构造变形样式为断层传播褶皱。寒武—奥陶纪正断层形成复式地垒,隐伏于中新世主干断层之下。二叠纪正断层可能伴生有岩浆活动。先存的正断层和岩浆岩对古董山中新世断裂活动具有明显的控制作用;后期的断裂活动,即上新世—更新世逆冲断层和正断层,对中新世形成的断裂构造有改造作用。古董山断裂带东南端与玛扎塔格构造带西端交汇,但两者不是同一条断裂带。The Gudongshan fault belt is situated in the Bachu rise, west part of the Tarim Basin, with NW-orientated striking and elongating beyond 140 km. Based on careful interpretation of seismic profiles, four generations of structural deformation have been recognized, i.e., the Cambro-Ordovician normal faulting, the Permian normal faulting, the Miocene thrusting and Pliocene-Pleistocene thrusting, and the latter being accompanied by normal faulting. The basement-involved thrusting in age of Miocene is main-controlling structure of the Gudongshan fault belt and consists of the main body of the belt, where the deformation style is fault- propagation folding. The Cambro-Ordovician normal faulting, firstly represented by this paper, makes up a compound horst and is buried beneath the Miocene fractures. The Permian normal faulting is accompanied with magmatism. The Miocene thrusting of the Gudongshan fracture is obviously constrained by the pre-existed normal faults and magmatic rocks, meanwhile, the Miocene fractural structures are reformed by the later faulting, i.e., the Pliocene-Pleistocene thrusting and normal faulting. The southeast terminal of Gudongshan fault belt connect the west terminal of Mazhatag structural belt, but they are not one fault belt.

关 键 词：古董山断裂 断层传播褶皱 塔里木盆地西部 

分 类 号：P542[天文地球—构造地质学]