下扬子中三叠世—中侏罗世沉积相与印支运动

下扬子地区三叠纪－中侏罗世经历了重大的构造运动──印支运动。在这个过程中三叠纪－中侏罗世的沉积环境发生了沧海桑田的巨变，其沉积相有规律的演化记录了该区构造运动（褶皱作用）的精细发育过程。同时，也确定了现存的下扬子盆地为次级分残体，原主盆地中心和基北部已消失在华北与扬子板块俯冲－碰撞造山带之下。下扬子印支运动正是碰撞造山作用的反映，实为一个渐进递变的收缩过程，并无主次幕之分。

MIDDLE TRIASSIC-MIDDLE JURASSIC SEDIMENTARY FACIES AND INDOSINIAN MOVEMENT IN THE LOWER YANGTZE REGION

The Triassic-Middle Jurassic sedimentary features in the lower Yangtze region might witness a major tectonic movement-the Indosinian movement. Great changes resulting in the sedimentary environmerit from marine to continental would have taken place during this period. The regular evolution of the sedimentary f acies probably recorded a detail process of development of the tectonic move-ment(folding in particutar) in the region. Besides, the existing lower Yangtze basin is beleived to be a remnant subbasia, and the center and the northern part of the original basin disappeared beneath a possible subduction-collision orogenic belt between the North China and Yangtze plates. The Indosian movement in the lower Yangtze region as an expression of this collisional orogeny, is believed to be a progressive deformation process, showing no difference between the principal and subordinate tectonic phases.