扬子板块北缘中段前陆带构造变形特征及意义  

Structural style and tectonic significance of foreland belt in the middle segment of northern Yangtze plate

作　　者：王凯[1,2,3] 刘少峰[2,3] 王平[4] 姜承鑫[2,3] 郜瑭珺[5] 

机构地区：[1]西安地质矿产研究所,西安710054 [2]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [3]中国地质大学地球科学与资源学院,北京10083 [4]南京师范大学地理科学学院,南京210000 [5]中国石油化工股份有限公司勘探南方分公司,成都610041

出　　处：《地质科学》2013年第3期609-625,共17页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金重点项目(编号:41030318);国家重点基础研究发展计划项目(编号:2011CB808900);高等学校科学创新引智计划项目(编号:B07011);中国石油化工股份有限公司前瞻性研究项目资助

摘　　要：扬子板块北缘中段前陆褶皱逆冲带在中生代经历了多期的构造叠加和改造,其复杂的构造样式记录了早期扬子板块与秦岭—大别微板块拼贴碰撞作用以及晚期转入的陆内变形过程。本文在前人研究的基础上通过对扬子板块北缘中段保康—房县地区前陆带构造变形样式及运动学特征的分析,划分出扬子板块北缘前陆褶皱逆冲带的根部、前锋及其内部次级的逆冲推覆构造单元;同时识别出一条过保康—神农架—蒲溪一带近东西走向的左行走滑剪切带,分析表明该左行走滑带形成于扬子板块北缘全面转入陆内变形之后、大巴山大规模向南西逆冲推覆运动之前的中侏罗世到晚侏罗世期间。该左行走滑剪切带对扬子板块相对于华北板块发生顺时针旋转的过程起到了调节作用,对于扬子板块北缘中生代构造演化具有重要意义。The foreland fold-and-thrust belt developed in the middle segment of northern Yangtze plate underwent many periods of structural superpose and reformation, whose complex structural deformation distinctly records the process of collision and subduction between the Yangtze plate and Qingling-Dabie micro-plate in Mesozoic and the later tectonic evolution after transforming into intracontinental deformation. Based on the analysis of the structural deformation styles and kinematic characteristics in the middle segment of northern Yangtze plate, Baokan-Fangxian area, this paper assures the specific location of the front of the foreland fold-and-thrust belt in the northern Yangtze plate and the features of the thrust and napping tectonics, which developed at the later stage, and also identifies a sinistral strike slip fault running through the region of Baokang, Fangxian and Puxi. At the same time, the analysis shows that the strike slip fault played a regulating role in the process of Yangtze plate clockwise rotation relatively to the north China plate after the period of Middle-Jurassic, which is vital to understand the tectonic evolution of the northern Yangtze plate in Mesozoic.

关 键 词：扬子板块 前陆褶皱逆冲带 构造格架 左行走滑 

分 类 号：P542[天文地球—构造地质学]