扬子板内递进变形——南方构造问题之二

印支—早燕山期由于古特提斯洋盆地关闭,扬子板块大陆边缘受到挤压与碰撞作用,在板内形成了江南—雪峰基底拆离体(A带),由于从南东向北西方向(同时派生由东向西,由南向北方向)的大规模水平推挤作用,使扬子板内中古生界盆地发生了由强及弱的递进(衰减)变形改造。在其前缘形成了高角度冲断层—断弯褶皱带(B带)、逆掩断层—断展褶皱带(C带)、滑脱断层—滑脱褶皱带(D带)、共轭冲断层—膝折褶皱带(E带)和古隆起—单斜带(F带);在其后缘则形成了滑覆断层—滑脱褶皱带(G带)。不同构造变形区带具有不同的水平位移量和压缩变形量、不同的逆冲断裂与褶皱的空间配置、不同的构造圈闭类型和保存条件,因而控制了不同类型的油气聚集与分布。 

PROGRESSIVE DEFORMATION IN YANGTZE PLATE——SERIES 2 OF THE SOUTHERN STRUCTURE STUDIES

From Indosinian to early Yanshanian,ancient Tethys basin closed.The continent margin of Yangtze Plate was extruded and collided,forming the Jiangnan-Xuefeng basement decoupling structure(zone A) in the plate.Due to the massive horizontal extrusion effect from SE to NW(E to W,S to N at the meanwhile),Meso-Paleozoic basins in Yangtze Plate were deformed progressively.At the front,the following zones were formed: high-obliquity thrust and fault-bend fold zone(zone B),overthrust and fault-propagation fold zone(zone C),detachment fault and detachment fold zone(zone D),conjugate thrust and kink fold zone(zone E),and ancient uplift and monocline zone(zone F).At the back,decollement fault and detachment fold zone(zone F) was formed.In different deformation zones,horizontal displacement and compressive deformation,placement of thrust fault and fold,as well as tectonic trap types and preservation are all different,hence controlling petroleum accumulation and distribution of different types.