Fig. 4: Comparison of molecular and isotopic compositions between alkanes from pre-GOE and post-GOE sites. | Nature Communications

Fig. 4: Comparison of molecular and isotopic compositions between alkanes from pre-GOE and post-GOE sites.

From: Methane from microbial hydrogenolysis of sediment organic matter before the Great Oxidation Event

Fig. 4

a δ13C versus δD of alkanes. b Exponential (Flory–Schulz) distribution of alkane abundance. c δD versus reciprocal of hydrogen number. d δ13C versus reciprocal of carbon number. Pre-GOE sites: 1—Kidd Creek mines (2.7 Ga); 2—Copper Cliff mines (2.45 Ga); 3—Kloof, Driefontein, and Mponeng mines (3.0–2.7 Ga). Post-GOE sites: 4—Juuka and Pori mines (1.95 Ga).

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