主题:扬子地块西南缘;中元古代一三叠纪;沉积体系;沉积格架;事件沉积;沉积盆地演化;元素地球化学背景;沉积盆地与地球化学;SW Margin of Yangtze Block;Mid-Proterozoic-Triassic;Depositional systems;Depositional framework;Event sediments;Evolution of sedimentary basin;Geochemical backgrounds;Sedimentary basin and Geochemistry