川南、滇北、黔北的上二叠统龙潭组(宣威组)底部 C_(25)煤层中夹有一层夹矸,分布范围较大,厚度较稳定,可作为标志层。过去一度被误作硅澡土,经镜下鉴定及物化测试后,实为高岭石页岩。一、高岭石页岩的特征(一)宏观特征及横向变化高岭石页岩呈黑、黑灰色及浅紫红色,泥质结构,水平层理发育,经风化失水后其 There is a layer of pinch in the bottom of the Upper Permian Longtan Formation (Xuanwei Formation) in the south of Sichuan, northern Yunnan and northern Guizhou, which has a large distribution range and relatively stable thickness and can be used as a marker layer. In the past was mistaken for silicon bath soil, the microscopic identification and physical and chemical testing, the real kaolinite shale. First, the characteristics of kaolinite shale (a) macroscopic characteristics and lateral changes kaolinite shale was black, dark gray and light purple, muddy structure, the level of stratification development, the weathering after dehydration