Fig. 6

Crossplot of geochemical parameters of the Chang 7 sub-member source rocks in the Ordos Basin (a). Crossplot between C₂₉ ααα 20 S/(20 S + 20R) and C₂₉ αββ/(αβ + ααα); ; (b). crossplot between C₃₁ 22 S/(S + R) and C₃₂ 22 S/(S + R)).