Figure 4. Concentrations of CaCO3, TOC, and headspace CO2 and methane in sediments from Site 1084 in the Angola-Namibia upwelling depositional regime. Elevated C1/C2 ratios indicate microbial origins for these hydrocarbon gases.

Figure 4. Concentrations of CaCO₃, TOC, and headspace CO₂ and methane in sediments from Site 1084 in the Angola-Namibia upwelling depositional regime. Elevated C₁/C₂ ratios indicate microbial origins for these hydrocarbon gases.