Methane production and consumption in anoxic marine sediments

Barnes, Ross O.; Goldberg, Edward D.

doi:10.1130/0091-7613(1976)4<297:mpacia>2.0.co;2

Cited by 446 publications

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“…From shallow sediments, methane is typically lost by advection and diffusion into the water column and by consumption through AOM (Barnes and Goldberg, 1976;Reeburgh, 1976). Present AOM in Batumi top sediments is indicated by methane depletions relative to higher LMWHC along with enrichments in carbon dioxide in type I ss gas compared to type IIa gas (Table 2; Fig.…”

Section: Methane Consumption and Production In Shallow Sedimentsmentioning

confidence: 99%

“…These include i) biological degradation of individual compounds (James and Burns, 1984;Kniemeyer et al, 2007;Larter and di Primio, 2005;Pallasser, 2000), ii) preferential incorporation into hydrate cages (Sloan and Koh, 2007), iii) admixture of secondary volatiles derived from degradation of oil (Milkov and Dzou, 2007;Prinzhofer and Pernaton, 1997;Seewald, 2003), and iv) preferential methane consumption mediated by the anaerobic oxidation of methane (AOM) in top sediments (Barnes and Goldberg, 1976;Hinrichs and Boetius, 2002;Hoehler et al, 1994;Reeburgh, 1976). Considering the different alteration effects associated with upward migration and partitioning, the molecular and isotopic composition of LMWHC in shallow sedimentary pools or in vent gas can deviate from the source gas of the reservoir.…”

Section: Introductionmentioning

confidence: 99%

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Molecular and isotopic partitioning of low-molecular-weight hydrocarbons during migration and gas hydrate precipitation in deposits of a high-flux seepage site

et al. 2010

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Detailed knowledge of the extent of post-genetic modifications affecting shallow submarine hydrocarbons fueled from the deep subsurface is fundamental for evaluating source and reservoir properties. We investigated gases from a submarine high-flux seepage site in the anoxic Eastern Black Sea in order to elucidate molecular and isotopic alterations of low-molecular-weight hydrocarbons (LMWHC) associated with upward migration through the sediment and precipitation of shallow gas hydrates. For this, nearsurface sediment pressure cores and free gas venting from the seafloor were collected using autoclave technology at the Batumi seep area at 845 m water depth within the gas hydrate stability zone. Vent gas, gas from pressure core degassing, and from hydrate dissociation were strongly dominated by methane (> 99.85 mol.% of ∑[C 1 -C 4 , CO 2 ]). Molecular ratios of LMWHC (C 1 /[C 2 + C 3 ] > 1000) and stable isotopic compositions of methane (δ 13 C = − 53.5‰ V-PDB; D/H around − 175‰ SMOW) indicated predominant microbial methane formation. C 1 /C 2+ ratios and stable isotopic compositions of LMWHC distinguished three gas types prevailing in the seepage area. Vent gas discharged into bottom waters was depleted in methane by > 0.03 mol.% (∑[C 1 -C 4 , CO 2 ]) relative to the other gas types and the virtual lack of 14 C-CH 4 indicated a negligible input of methane from degradation of fresh organic matter. Of all gas types analyzed, vent gas was least affected by molecular fractionation, thus, its origin from the deep subsurface rather than from decomposing hydrates in near-surface sediments is likely. As a result of the anaerobic oxidation of methane, LMWHC in pressure cores in top sediments included smaller methane fractions [0.03 mol.% ∑(C 1 -C 4 , CO 2 )] than gas released from pressure cores of more deeply buried sediments, where the fraction of methane was maximal due to its preferential incorporation in hydrate lattices. No indications for stable carbon isotopic fractionations of methane during hydrate crystallization from vent gas were found. Enrichments of 14 C-CH 4 (1.4 pMC) in short cores relative to lower abundances (max. 0.6 pMC) in gas from long cores and gas hydrates substantiates recent methanogenesis utilizing modern organic matter deposited in top sediments of this high-flux hydrocarbon seep area.

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Section: Methane Consumption and Production In Shallow Sedimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular and isotopic partitioning of low-molecular-weight hydrocarbons during migration and gas hydrate precipitation in deposits of a high-flux seepage site

et al. 2010

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“…Understanding methanotrophy, and specifically the location and pathway of oxidation, is significant because this process limits the CH 4 flux to the atmosphere. Anaerobic oxidation of CH 4 (AOM) has been identified in marine environments, mainly coupled to sulfate reduction, using geochemical (Martens and Berner 1974;Barnes and Goldberg 1976;Reeburgh 1976) and biological evidence (Hinrichs et al 1999;Boetius et al 2000;Orphan et al 2001). Pore-water sulfate profiles have also been used to indicate AOM in marine environments.…”

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confidence: 99%

Quantifying rates of methanogenesis and methanotrophy in Lake Kinneret sediments (Israel) using pore‐water profiles

Adler

Eckert

Sivan

2011

Limnology & Oceanography

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Full seasonal sets of chemical and isotope profiles from the pore water of Lake Kinneret (Sea of Galilee, Israel) were produced to study methanogenesis and methanotrophy processes and the couplings between methane (CH 4 ), sulfur, and iron. Sulfate is depleted within the upper 10 cm of the sediment mainly by traditional bacterial sulfate reduction by organic matter. Maximum sulfate reduction rates calculated from sulfate concentration profiles are found at the water-sediment interface (0-1 cm 2 1.4 3 10 212 6 0.2 3 10 212 mol cm 23 s 21 ). CH 4 concentrations and modeling of dissolved inorganic carbon (DIC) and its stable carbon isotope (d 13 C DIC ) suggest that maximum methanogenesis rates of 2.5 3 10 213 6 1.5 3 10 213 mol cm 23 s 21 occur at 5-12-cm depth in the sediments, and that it ends at 20 cm. Of the produced CH 4 , 50-75% is converted to gas bubbles of CH 4 before it reaches the bottom water. Model results suggest the occurrence of anaerobic oxidation of CH 4 (AOM) in the deep sediments of the lake below the zone of methanogenesis.

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“…The consumption of CH 4 was assumed to be coupled to the consumption of sulfate, diffusing downward from the seafloor ( Fig. 3; Berner 1974, 1977;Barnes and Goldberg 1976;Reeburgh 1976;Alperin and Reeburgh 1985). Radioisotope tracer experiments with 14 C-labeled CH 4 and 35 S-labeled sulfate, showed a maximum AOM and SR rate at the methane sulfate transition zone (Reeburgh 1980;Iversen and Jørgensen 1985;Iversen et al 1987;Alperin 1989;Reeburgh et al 1991;Joye et al 1999).…”

Section: Anaerobic Oxidation Of Methanementioning

confidence: 99%

Biotechnological aspects of sulfate reduction with methane as electron donor

Meulepas

Stams

Lens

2010

Rev Environ Sci Biotechnol

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Biological sulfate reduction can be used for the removal and recovery of oxidized sulfur compounds and metals from waste streams. However, the costs of conventional electron donors, like hydrogen and ethanol, limit the application possibilities. Methane from natural gas or biogas would be a more attractive electron donor. Sulfate reduction with methane as electron donor prevails in marine sediments. Recently, several authors succeeded in cultivating the responsible microorganisms in vitro. In addition, the process has been studied in bioreactors. These studies have opened up the possibility to use methane as electron donor for sulfate reduction in wastewater and gas treatment. However, the obtained growth rates of the responsible microorganisms are extremely low, which would be a major limitation for applications. Therefore, further research should focus on novel cultivation techniques.

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Methane production and consumption in anoxic marine sediments

Cited by 446 publications

References 0 publications

Molecular and isotopic partitioning of low-molecular-weight hydrocarbons during migration and gas hydrate precipitation in deposits of a high-flux seepage site

Molecular and isotopic partitioning of low-molecular-weight hydrocarbons during migration and gas hydrate precipitation in deposits of a high-flux seepage site

Quantifying rates of methanogenesis and methanotrophy in Lake Kinneret sediments (Israel) using pore‐water profiles

Biotechnological aspects of sulfate reduction with methane as electron donor

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