Fig. 1

The geographical setting of the research location and geological structure features: (a) Location of Guizhou province; (b) Location of Northern Guizhou; (c) Unique geological characteristics of Northern Guizhou35.

The geographical setting of the research location and geological structure features: (a) Location of Guizhou province; (b) Location of Northern Guizhou; (c) Unique geological characteristics of Northern Guizhou35.