在详细研究单剖面的基础上,采用单因素分析、多因素综合作图法,编制了中上扬子地区中三叠世雷口坡期的定量岩相古地理图.通过研究认为,雷口坡期以海相沉积为主.由于海退,研究区整体处于浅水沉积区,不发育盆地和斜坡.西部康滇古陆趋于稳定,东南部华夏古陆上升,使中上扬子呈现东高西低的格局:东部为碎屑岩台地,西部为碳酸盐岩台地.根据研究区沉积背景和该期岩相古地理平面上的展布特征,总结出了中三叠世雷口坡期古地理演化过程及沉积模式.%The quantitative sedimentary facies and palaeogeographic map of the middle-upper Yangtze area during the Leikoupoan (Middle Triassic) is constructed on the basis of single factor and multiple factors mapping methods. Two ancient landmasses dominated by the marine deposits were once developed during the Leikoupoan. The regressions resulted in the gradation of the study area into the shallow-water depositional area, and no basin and slope were developed. The stable Xikang-Yunnan old land in western China and the uplifted Cathaysian old land in southeastern China display the tectonic framework of being higher in the east and lower in the west. The eastern part exhibits the clastic platform and the western part exhibits the carbonate platform. The Leikoupoan ( Middle Triassic) palaeogeographic evolution and sedimentary model are presented in this study for the study area.
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