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.