三叠系西康群碎屑岩主体为一套浊积岩复理石建造。通过对西康群砂、泥岩地球化学组成特征研究,认为其物源来自康滇古陆表壳岩及其上覆的盖层沉积,大地构造属性为被动大陆边缘到活动大陆边缘再到多岛弧的转化。
The clastic rocks widespread in the Triassic Xikang Group in western Sichuan consist dominantly of turbiditic flysch formations. The geochemical examination of the sandstones and mudstones from the Xikang Group has led us to conclude that the debris are derived mostly from the surficial rocks and their overlying deposits on the Xikang-Yunnan ancient land, and tectonic settings display the transition from the passive continental margin to active continental margin and finally to archipelago.