塔里木盆地塘古孜巴斯坳陷西部中加里东期断裂特征及形成机制  

Features and formation mechanism of middle Caledonian faults in west of Tangguzibasi depression, Tarim Basin

作　　者：李浩武[1] 王建君[1] 邬光辉[1,2] 史玲玲[3] 汪斌[3] 胡湘瑜[1] 高力[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中山大学海洋学院,广东广州510275 [3]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

出　　处：《中南大学学报（自然科学版）》2014年第12期4331-4341,共11页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2008ZX05004-04);国家重点基础研究发展计划(973计划)项目(2011CB201106)~~

摘　　要：根据其剖面特征可将塘古孜巴斯拗陷西部弧形断裂带划分为玛东盖层滑脱冲断体系和塘南基底卷入冲断体系2种类型。玛东盖层滑脱冲断体系都在中寒武统膏盐层内发生滑脱,塘南基底卷入冲断体系平面延伸距离较小,基本上都切穿寒武系地层延伸至基底。玛东和塘南的断裂的形成,是对中加里东期塔里木板块与阿尔金地块拼接的响应。中奥陶世开始时阿尔金地块上近东西向、由南向北逆冲的阿尔金断裂强烈活动,晚奥陶世应力传递至玛4井-叶城一带时,受刚性基底阻挡,反作用力首先在软弱基底的玛东一带形成反冲断层;奥陶纪末,随着来自南部应力的增加,塘南山前逆冲断裂带形成。而玛东冲断带南部断层在印支期的活化,属于古特提斯洋向中昆仑地体俯冲的产物。与造山带之间的距离、寒武系膏岩层的厚度及基底类型的不同导致玛东与塘南发育不同类型的构造类型。The faults in the west of Tangguzibasi sag can be divided into Madong cover detachment faulting system and Tangnan basement involved faulting system, depending on the characteristics of the seismic profiles. Faults of Madong system are all detached in the Middle Cambrian salt layer, the faults of Tangnan system are short, and most of them cut deeply into the basement. Faults in Madong and Tangnan system were products of the collision between Tarim Plant and Altyu Massif, during Middle Caledonian. From Middle Ordovician to Silurian, the intense activity of the Altyu fault passed the stress from south to north. In late Ordovician, stress passed to Mazhatage-Yecheng area, resisted by the rigid basement there, the counteracting force firstly formed the thrust belt in the weak basement of Madong area. The basement of Tangnan area was also rigid, and so there were few faults formed during that period. At the end of Ordovician, the stress became stronger, and basement involved and piedmont thrust faults were formed in Tangnan area, from north tosouth. The reactivation of the Madong thrust belt was the manifestation of the collision between Kunkun block and Paleotethys in Late Hercynian. The fault style of Madong and Tangnan were controlled by the distance from orogenic belt, the thickness of Middle Cambrian salt, and the type of basement.

关 键 词：塘古孜巴斯坳陷 玛东冲断带 塘南 盖层滑脱 基底卷入 山前逆冲断裂系统 反冲断裂系统 阿尔金断裂 

分 类 号：P548[天文地球—构造地质学] P624[天文地球—地质学]