采用现代微观测试技术手段，对华南P/T界线附近粘土层中粘土矿物学尤其是精细结构特征等开展深入系统的研究，查明沉积-成岩环境介质条件对火山灰蚀变过程及其产物的制约关系、蚀变转化过程中元素的迁移与蚀变转化机制；弄清不同沉积环境条件下决定火山物质蚀变粘土矿物及其精细结构特征的主要因素（如环境介质物理化学条件、微生物作用、成岩作用），建立不同沉积相之间火山灰蚀变粘土层的对应关系，并进而探究粘土矿物学特征对火山灰母质的示踪。

To obtain better understanding of the effect of sedimentation-diagenesis conditions on clay mineralogy especially its fine structure from ash alteration, study on volcanogenic clay mineralogy of the altered ash layers in the Permian-Triassic boundary stratigraphic sets in southern China is undertaken using modern microscopic methods. In addition, study is also undertakne to understand the constraints of sedementation-diagenesis conditions on alteration processes and their products, as well as element migration during the alteration process and formation of volcanogenic clay minerals. Effect of defferent semenetary environment (including physical chemical conditions of sulutions, microbial activity, diagenesis) on volcanogenic clay mineralogy especially its fine structure is deciphered based on genetic mineralogy, and the correlation of ash layer between the Permian-Triassic boundary stratigraphic sets of various sedimentary facies will is definied, as well as the volcanogenic clay mineralogy as an indicator of the lithology of a parent volcanic ash.