Microbial methane turnover at mud volcanoes of the Gulf of Cadiz

Niemann, Helge; Duarte, João C.; Hensen, Christian; Omoregie, Enoma; Magalhães, Vítor; Elvert, Marcus; Pinheiro, Luís Menezes; Kopf, Achim J; Boetius, Antje

doi:10.1016/j.gca.2006.08.010

Cited by 176 publications

(144 citation statements)

References 101 publications

(192 reference statements)

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“…These concretions appear to form at the interface of the sediment and underlying bedrock, and thus take on the appearance of exposed bedrock. This mode of occurrence is distinct from methane-derived carbonates from other seep environments (Bohrmann et al 1998;Michaelis et al 2002;Gieskes et al 2005;Niemann et al 2006), where sulfate penetration and AOM are limited to the upper sediment column. The occurrence of quartz sand cemented by 13 Fig.…”

Section: Subsurface Gas Pocketsmentioning

confidence: 67%

Gas flux and carbonate occurrence at a shallow seep of thermogenic natural gas

et al. 2010

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The Coal Oil Point seep field located offshore Santa Barbara, CA, consists of dozens of named seeps, including a peripheral ∼200 m 2 area known as Brian Seep, located in 10 m water depth. A single comprehensive survey of gas flux at Brian Seep yielded a methane release rate of ∼450 moles of CH 4 per day, originating from 68 persistent gas vents and 23 intermittent vents, with gas flux among persistent vents displaying a log normal frequency distribution. A subsequent series of 33 repeat surveys conducted over a period of 6 months tracked eight persistent vents, and revealed substantial temporal variability in gas venting, with flux from each individual vent varying by more than a factor of 4. During wintertime surveys sediment was largely absent from the site, and carbonate concretions were exposed at the seafloor. The presence of the carbonates was unexpected, as the thermogenic seep gas contains 6.7% CO 2 , which should act to dissolve carbonates. The average δ 13 C of the carbonates was −29.2±2.8‰ VPDB, compared to a range of −1.0 to +7.8‰ for CO 2 in the seep gas, indicating that CO 2 from the seep gas is quantitatively not as important as 13 Cdepleted bicarbonate derived from methane oxidation. Methane, with a δ 13 C of approximately −43‰, is oxidized and the resulting inorganic carbon precipitates as highmagnesium calcite and other carbonate minerals. This finding is supported by 13 C-depleted biomarkers typically associated with anaerobic methanotrophic archaea and their bacterial syntrophic partners in the carbonates (lipid biomarker δ 13 C ranged from −84 to −25‰). The inconsistency in δ 13 C between the carbonates and the seeping CO 2 was resolved by discovering pockets of gas trapped near the base of the sediment column with δ 13 C-CO 2 values ranging from −26.9 to −11.6‰. A mechanism of carbonate formation is proposed in which carbonates form near the sediment-bedrock interface during times of sufficient sediment coverage, in which anaerobic oxidation of methane is favored. Precipitation occurs at a sufficient distance from active venting for the molecular and isotopic composition of seep gas to be masked by the generation of carbonate alkalinity from anaerobic methane oxidation.

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Section: Subsurface Gas Pocketsmentioning

confidence: 67%

Gas flux and carbonate occurrence at a shallow seep of thermogenic natural gas

et al. 2010

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“…Peckmann et al, 2001;Peckmann and Thiel, 2004;Konshauser, 2007;Birgel et al, 2008). Precipitation of microbial-induced carbonates or sulphides cannot be c1early assumed from textural observations, but the physico-chemical environmental conditions are suitable for microbial activity, and biomineralisation-microbial communities have been reported in the area (Niemann et al, 2006;Stadnitskaia et al, 2008;Templer et al, 2011). These findings allow us to infer these textural features as indications of microbial-induced mineralisation processes.…”

Section: Stage One: the Diagenetic Processmentioning

confidence: 99%

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

et al. 2012

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“…ANME-1 and ANME-2 are most abundant and geographically widespread. ANME are phylogenetically distantly related to cultivated methanogenic members from the orders Methanosarcinales and Methanomicrobiales (Hinrichs et al 1999;Orphan et al 2002;Knittel et al 2005;Niemann et al 2006). Orphan et al (2001aOrphan et al ( , 2002) combined isotopic and phylogenetic analysis and showed that cells belonging to ANME-1 and ANME-2 assimilated carbon from CH 4 during AOM.…”

Section: Anaerobic Methanotrophsmentioning

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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Microbial methane turnover at mud volcanoes of the Gulf of Cadiz

Cited by 176 publications

References 101 publications

Gas flux and carbonate occurrence at a shallow seep of thermogenic natural gas

Gas flux and carbonate occurrence at a shallow seep of thermogenic natural gas

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

Biotechnological aspects of sulfate reduction with methane as electron donor

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