There was a terrestrial facies lake basin in study area and mainly developed clastic rock during the late Trias. 研究区晚三叠系为陆相湖盆沉积，以发育陆源碎屑岩系为主。
The rapid conversion of montmorillonite and the mass formation of kaolinite are related to large-scale dissolution of clastic rock. 蒙脱石的迅速转化和高岭石的大量析出与碎屑岩的大规模溶解有着密切的关系。
