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Dissolved Gases in Cariaco Trench Sediments: Anaerobic Diagenesis

  • Douglas E. Hammond
Part of the Marine Science book series (MR, volume 3)

Abstract

Gas pockets sampled in DSDP cores retrieved from the Cariaco Trench are about 90% CH4 and 8% CO2, with the remainder consisting of H2O, N2, and C2H6. Conversion of this data to in situ dissolved gas concentrations is hindered by the lack of an in situ sampler or a suitable internal standard, but the best estimate for the interstitial water dissolved gas concentrations is [CH4] ≃ 20 mmol/l, [N2] ≃ 0.07 mmol/l, [C2H6] ≃ 4 µmol/l. The carbon in CH4 is about 1% of carbon in organic compounds in the sediment, and is sufficiently abundant to suggest that CO2 reduction to CH4 causes carbonate precipitation.

Below 80 meters in the sediment, [N2] is present at less than 20% of its concentration in sea water. This is attributed to microbial activity. Calculation of pe from the pairs HCO 3 + /CH4, N2/NH 4 + , and C2H4/CH4 suggests that CO2 reduction to CH4 and N2 reduction to NH 4 + are accomplished by different microorganisms and C2H6 is a residual product of the degradation of larger molecules.

Keywords

Marine Sediment Government Printing Interstitial Water Carbonate Precipitation Core Liner 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • Douglas E. Hammond
    • 1
  1. 1.Lamont-Doherty Geological ObservatoryColumbia UniversityPalisadesUSA

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