Geochemical Characteristics and Sedimentary Environment of the Upper Permian Longtan Coal Series Shale in Western Guizhou Province, South China

Figure 6

(a) Plot of CPI vs. OEP (the basemap is from [26]) and (b) plot of Pr/nC₁₇ vs. Ph/nC₁₈ of the Longtan coal series shale (the basemap is from [25]).

(a)

(b)