Shift in the Mode of Carbon Cycling Recorded by Biomarkers and Carbon Isotopic Compositions in the Yanchang Formation, Ordos Basin: Autotrophy vs Heterotrophy.

An increasing trend of thermal maturity based on the Ph/ n -C 18 and Pr/ n -C 17 ratios was observed from the Chang 3 to Chang 8 member samples. 4.2.2 Hopanes and Steranes On the m / z 191 mass chromatograms, C 30 17α,21β( H ) hopane is predominant, followed in abundance by C 29 norhopane ( Figure 6 ).

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