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一、前言 研究区呈南北向狭长地带展布于川滇交界处,在“杨子准地台”的西南隅。全区自震旦纪至二迭纪,曾遭广泛海浸,在以浅海相为主的沉积过程中,虽然地壳有升有降,海水时进时退,但地史发展的总趋势是陆地不断扩大,海域逐渐退缩,表现了正向隆起的特点。在隆起的同时,纵向张性断层,多期活动,不断下切,逐渐形成了巨大的纵张断裂带,为多期岩浆活动提供了空间和通道。至中生代,海退成陆,在断陷盆地内接受了陆相碎屑岩建造。燕山运动,全区盖层发生褶皱,形成了现今地貌雏形。
I. Preface The study area has a narrow strip of north-south distribution in the junction of Sichuan and Yunnan, in the “Yangzi prospective platform” in the southwestern corner. The whole area from the Sinian to the Second Diego, has been extensive sea immersion, in the shallow marine facies deposition process, although the crustal rise and fall, seawater into and out of time, but the general trend of the development of land history is land Constantly expanding, the sea gradually retreat, showing the characteristics of the positive uplift. At the same time of the uplift, the Chang-Zhang fault, multi-period activity and undercutting gradually formed a huge longitudinal fault zone, which provided space and channel for multi-period magmatism. To Mesozoic, sea retreat into land, accepted in the faulted basin continental clastic rock construction. Yanshan movement, fold cover the whole area, forming the prototype of today’s landform.