Figure 41. Multiple sources (biogenic, thermogenic, and catagenic) and
production mechanisms for the hydrocarbons encountered during Leg 190
were identified by plotting the methane (C1), Bernard ratios (C1/[C2+C3]),
and sulfate profiles for the individual sites drilled during Leg 190. Note that
depth scale is different for each plot. Vertical lines represent zones for
thermogenic, mixed, and bacterial regions for the hydrocarbon profiles.