Figure F15. Sulfate (SO42-) and methane (CH4) concentration profiles in the upper 20 mbsf at Site 1252. Interstitial methane concentrations are from headspace data (see "Organic Geochemistry"). The linear portion of the curve through the sulfate reduction zone was used to calculate upward methane flux at Site 1252, based on the shown linear regression. The sulfate/methane interface (SMI) is also shown.

Figure F15. Sulfate (SO₄^2-) and methane (CH₄) concentration profiles in the upper 20 mbsf at Site 1252. Interstitial methane concentrations are from headspace data (see "Organic Geochemistry"). The linear portion of the curve through the sulfate reduction zone was used to calculate upward methane flux at Site 1252, based on the shown linear regression. The sulfate/methane interface (SMI) is also shown.