Figure F35. Headspace CH4 concentrations, Sites U1428 and U1429. A. Complete profile with CH4 concentrations on a log scale and other sites plotted for comparison. B. The upper 250 m CSF-A of Holes U1428A and U1429A to highlight the SMT. Note that concentration values are not meaningful at depths where CH4 surpasses saturation at 1 atm pressure (~10,000 ppm at ~20 m CSF-A). Also note that measured concentrations and ratios decrease with depth because of differential gas solubility with temperature.
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