【摘要】 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一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盆地残体,原主盆地中心和其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。更多还原

【Abstract】 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.更多还原