上扬子台地西缘二叠系─三叠系层序界面成因分析与盆山转换许效松，刘宝珺，赵玉光（地矿部成都地质矿产研究所）二叠纪—三叠纪上扬子台地西缘经历了被动大陆边缘早期裂谷阶段—热沉降—前陆盆地的转换过程。与构造转换相对应，该区发生了五次二级海平面升降周期，形成了... Permian-Triassic sequence boundary interface and basin-to-basin transition in the western margin of the Upper Yangtze platform XU Xiao-song, LIU Bao-jun, ZHAO Yu-guang (Permian-Chengdu Institute of Geology and Mineral Resources) Permian- Early rift stage - thermal deposition - foreland basin conversion process in continental margin. Corresponding to the structural transformation, there are five second-level sea level rise-and-fall cycles in this area, forming ...