印支期褶冲构造向燕山期板内逆冲构造的转换——以赣南于都-宁都地区为例

：在赣南于都-宁都一带，发育两期北北东向逆冲构造：早期为印支期上盘从南东东往北西西运动的褶皱-逆冲组合样式，具有叠瓦状、缓倾角特征；晚期为燕山期上盘从南东东往北西西的陡立逆冲构造，相对规模较小，不具叠瓦状特征．早期褶冲构造反映扬子板块与华南褶皱带印支期挤压碰撞在被动大陆边缘的构造响应．而燕山期的构造样式反映板内变形特点．从印支期到燕山期，研究区完成了从板缘变形到板内变形的转换．

Transformation from Indosinian Fold-thrust Belt to Yanshanian Intraplate Thrust Fault: An Example from Yudu-Ningdu Area, Southern Jiangxi Province of China

Two stages of thrust structures were identified in the Yudu-Nindu area of southern Jiangxi Province. The earlier one is an Indosinian top to northwest fold-thrust belt with low-angle imbricate pattern. The latter one is a Yanshanian top to northwest steep thrust faults without imbricate pattern. The Indosinian thrust-fold belt resulted from a convergence between the Yangtzi plate and the Huanan folded belt, and the Yanshanian one from an intraplate deformations. The tectonic environment of the studied area was changed from a passive margin of a plate to an intraplate from the Indosinian period to Yanshanian period.