Figure 6

Comparison of lipid biomarker signatures of authigenic carbonates from the CB, Congo fan (CF), Nile deep-sea fan (NDSF), Niger fan (NF), and Gulf of Mexico (GoM): (a) concentrations of major lipid biomarkers and ratios of sn-2-hydroxyarchaeol relative to archaeol, and (b) carbon isotopic compositions of major lipid biomarkers with those of carbonates.