Figure F14. C1/C2 ratios of gas in DSDP/ODP cores showing dependence of ethane content on temperature history (heating rate). Thermal gradients are 200°C/km for Hole 1038, 70°C/km for Hole 229, and ~30º/km for Hole 1073. Bottom water temperature is 22°C at Site 229, and 2°–3°C at Sites 1038 and 1073. Sedimentation rates are 500

Figure F14. C₁/C₂ ratios of gas in DSDP/ODP cores showing dependence of ethane content on temperature history (heating rate). Thermal gradients are 200°C/km for Hole 1038, 70°C/km for Hole 229, and ~30º/km for Hole 1073. Bottom water temperature is 22°C at Site 229, and 2°–3°C at Sites 1038 and 1073. Sedimentation rates are 500–900 m/m.y. at each site.