Chemical and isotopic evidence for the nature of the fluid in CH 4 -containing sediments of the Håkon Mosby Mud Volcano

Lein, Alla Yu; Vogt, Peter R.; Crane, Kathleen; Егоров, А. А.; Ivanov, M. V.

doi:10.1007/s003670050095

Cited by 54 publications

(43 citation statements)

References 14 publications

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“…This may be due to ancient pre-Quaternary source rock contributing to the sediments due to erosion (Yunker et al, 1996) or the migration of thermally mature petroleum hydrocarbons into the surface sediments. Their input into the surface Quaternary sediments may occur both by means of sub-aquatic or continental erosion and by means of migration of deep fluids, as for example leading to venting through the sediment surface and the formation of mud volcanoes (Lein et al, 1999).…”

Section: Cyclic Hydrocarbonsmentioning

confidence: 99%

Petroleum-related hydrocarbons in deep and subsurface sediments from South-Western Barents Sea

Boitsov

Петрова

Jensen

et al. 2011

Marine Environmental Research

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Havforskningsinstituttets institusjonelle arkiv Brage IMR - Institutional repository of the Institute of Marine Research b r a g e i m rDette er forfatters siste versjon av den fagfellevurderte artikkelen, vanligvis omtalt som postprint. I Brage IMR er denne artikkelen ikke publisert med forlagets layout fordi forlaget ikke tillater dette. Du finner lenke til forlagets versjon i Brage-posten. Det anbefales at referanser til artikkelen hentes fra forlagets side. Ved lenking til artikkelen skal det lenkes til post i Brage IMR, ikke direkte til pdf-fil.This is the author's last version of the article after peer review and is not the publisher's version, usually referred to as postprint. You will find a link to the publisher's version in Brage IMR. It is recommended that you obtain the references from the publisher's site.Linking to the article should be to the Brage-record, not directly to the pdf-file. AbstractSubsurface sediments from a pockmark area in South-Western Barents Sea have been earlier found to contain elevated levels of petroleum-related polycyclic aromatic hydrocarbons. This work describes a comprehensive analysis of various biomarkers, including the highly sourcespecific hopanes, in a 4.5 m long gravity core from the same area, together with subsurface sediment samples from other areas in the region without pockmarks present ("background samples"). A clear difference between the pockmark gravity core and the background sediment cores was found, both with regard to genesis and the level of transformation of organic matter. A number of indicator parameters, such as methylphenanthrene index (MPI-1), point towards a significantly higher maturity of hydrocarbons in the pockmark core throughout its length as compared to the other sampled locations. Higher contents of microbial hopanoids (hopenes) may indicate the former presence of petroleum. These findings confirm the hypothesis of a natural hydrocarbon source in the deeper strata present in the studied location with pockmarks.

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Section: Cyclic Hydrocarbonsmentioning

confidence: 99%

Petroleum-related hydrocarbons in deep and subsurface sediments from South-Western Barents Sea

Boitsov

Петрова

Jensen

et al. 2011

Marine Environmental Research

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“…However, seeps in high-Arctic regions are poorly explored. Further south, at the Norwegian margin, Håkon Mosby mud volcano (HMMV) was discovered in 1989 (72°N, 14°E) at 1250 m water depth (Vogt et al 1997, Lein et al 1999. Venting of methane at HMMV occurs from gas hydrates in the sub-seabed (Vogt et al 1997, Lein et al 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Further south, at the Norwegian margin, Håkon Mosby mud volcano (HMMV) was discovered in 1989 (72°N, 14°E) at 1250 m water depth (Vogt et al 1997, Lein et al 1999. Venting of methane at HMMV occurs from gas hydrates in the sub-seabed (Vogt et al 1997, Lein et al 1999). Numerous biogeochemical studies have documented methane fluxes, sediment characteristics and ecological structure at the site (Gebruk et al 2003, Niemann et al 2006, Lösekann et al 2007, Decker et al 2012.…”

Section: Introductionmentioning

confidence: 99%

Arctic cold seeps in marine methane hydrate environments: impacts on shelf macrobenthic community structure offshore Svalbard

Åström¹,

Carroll²,

Ambrose³

et al. 2016

Mar. Ecol. Prog. Ser.

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Cold seeps are sites where hydrocarbons, sulfide and other reduced compounds emanate from the seabed, providing the setting to fuel chemoautotrophic production. Microbial assemblages convert these com - ). The presence of obligate seep-associated faunal taxa demonstrates that chemoautotrophic production, fueled by methane and sulfur, influences benthic communities at these seeps. Further, total biomass was significantly higher at seep-impacted stations compared to controls (mean = 20.7 vs. 9.8 g wet weight sample −1 ), regardless of region. Four methane seep-influenced samples showed clear indications of seep impact, with reduced diversity and with a few species dominating, compared to controls. Our results demonstrate that the effect of methane seeps on the Svalbard shelf benthic community are highly localized (i.e. meter scale), reflecting strong gradients associated with the point-source impacts of individual seeps. Regional differences and the restricted spatial extent of focused emissions likely drive the observed complexity and heterogeneity at Svalbard cold seeps. These results provide key baseAmerican plaice Hippoglossoides platessoides in a dense field of chemosymbiotic polychaetes at a Svalbard cold seep. Photo: CAGE OPEN PEN ACCESS CCESSline observations in a high-Arctic location that is likely to be influenced by warming sea temperatures, which may lead to increased seabed methane release.

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“…The Haakon Mosby Mud Volcano (HMMV) is a submarine mud volcano and is the only one in a polar region which has been studied in great detail (8,16,18,25,38,47,61,62,68,80,81). Very recently, we showed that the HMMV hosts three key microbial communities ( Fig.…”

mentioning

confidence: 99%

Diversity and Abundance of Aerobic and Anaerobic Methane Oxidizers at the Haakon Mosby Mud Volcano, Barents Sea

Lösekann

Knittel

Nadalig

et al. 2007

Appl Environ Microbiol

359

368

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Submarine mud volcanoes are formed by expulsions of mud, fluids, and gases from deeply buried subsurface sources. They are highly reduced benthic habitats and often associated with intensive methane seepage. In this study, the microbial diversity and community structure in methane-rich sediments of the Haakon Mosby Mud Volcano (HMMV) were investigated by comparative sequence analysis of 16S rRNA genes and fluorescence in situ hybridization. In the active volcano center, which has a diameter of about 500 m, the main methaneconsuming process was bacterial aerobic oxidation. In this zone, aerobic methanotrophs belonging to three bacterial clades closely affiliated with Methylobacter and Methylophaga species accounted for 56% ؎ 8% of total cells. In sediments below Beggiatoa mats encircling the center of the HMMV, methanotrophic archaea of the ANME-3 clade dominated the zone of anaerobic methane oxidation. ANME-3 archaea form cell aggregates mostly associated with sulfate-reducing bacteria of the Desulfobulbus (DBB) branch. These ANME-3/DBB aggregates were highly abundant and accounted for up to 94% ؎ 2% of total microbial biomass at 2 to 3 cm below the surface. ANME-3/DBB aggregates could be further enriched by flow cytometry to identify their phylogenetic relationships. At the outer rim of the mud volcano, the seafloor was colonized by tubeworms (Siboglinidae, formerly known as Pogonophora). Here, both aerobic and anaerobic methane oxidizers were found, however, in lower abundances. The level of microbial diversity at this site was higher than that at the central and Beggiatoa species-covered part of the HMMV. Analysis of methyl-coenzyme M-reductase alpha subunit (mcrA) genes showed a strong dominance of a novel lineage, mcrA group f, which could be assigned to ANME-3 archaea. Our results further support the hypothesis of Niemann et al. (54), that high methane availability and different fluid flow regimens at the HMMV provide distinct niches for aerobic and anaerobic methanotrophs.Large amounts of methane are stored in the subsurface ocean as crystalline gas hydrate, dissolved in porewater, and as free gas. Most of the methane which rises from subsurface reservoirs is consumed by anaerobic microorganisms inhabiting sulfate-penetrated sediment layers before it reaches the seafloor (65). This microbially mediated anaerobic oxidation of methane (AOM) controls the emission of the greenhouse gas methane from the ocean to the atmosphere (see reference 23 and references therein).In marine habitats, the metabolic process of AOM is proposed to be a reversed methanogenesis coupled to the reduction of sulfate involving methanotrophic archaea (ANME archaea) and sulfate-reducing bacteria (SRB). ANME archaea and SRB are assumed to interact syntrophically (26) and form microbial consortia which oxidize methane with equimolar amounts of sulfate, yielding bicarbonate and sulfide (26, 51, 52). Sulfide produced as a by-product of AOM at cold seeps often supports chemosynthetic communities which derive energy from sulfide oxidation. ...

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Chemical and isotopic evidence for the nature of the fluid in CH 4 -containing sediments of the Håkon Mosby Mud Volcano

Cited by 54 publications

References 14 publications

Petroleum-related hydrocarbons in deep and subsurface sediments from South-Western Barents Sea

Petroleum-related hydrocarbons in deep and subsurface sediments from South-Western Barents Sea

Arctic cold seeps in marine methane hydrate environments: impacts on shelf macrobenthic community structure offshore Svalbard

Diversity and Abundance of Aerobic and Anaerobic Methane Oxidizers at the Haakon Mosby Mud Volcano, Barents Sea

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