Stable isotopic evidence in support of active microbial methane cycling in low-temperature diffuse flow vents at 9°50′N East Pacific Rise

Proskurowski, G.; Lilley, Marvin D.; Olson, E. J.

doi:10.1016/j.gca.2008.01.025

Cited by 49 publications

(54 citation statements)

References 99 publications

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“…6. The estimated H 2 /CH 4 ratio of the HAKUREI fluid (0.022) is significantly lower than those of sediment-starved hydrothermal sites (>1, Welhan and Craig, 1983;Charlou et al, 2002;Kumagai et al, 2008;Proskurowski et al, 2008;Takai et al, 2008) that correspond to abiotic gas. Notably, the H 2 /CH 4 ratio of the HAKUREI fluid was comparable with those of thermogenic gases produced by hydrothermal experiment using the Guaymas Basin sediment (0.02~0.2: Seewald et al, 1994) as well as other sediment-related hydrothermal sites (Fig.…”

Section: H 2 /Ch 4 Ratiomentioning

confidence: 74%

“…Although microbial contribution accounts for the δ 13 C value in the HAKUREI plume as well as that in the JADE plume, the enriched δ 13 C value in the estimated endmember HAKUREI fluid can be also derived from involvement of isotopically heavy methane from the fluid-sediment interaction (~-23‰: Seewald et al, 1994) into upwelling fluid, which has δ 13 C value as low as that observed in the JADE fluid (-36~-41‰). Alternatively, temporal change of the endmember δ 13 C value in the JADE fluid for last decades is also possible (e.g., Proskurowski et al, 2008). If the δ 13 C value in the JADE fluid at 2008 is similar to those estimated from our plume observation, involvement of plume alteration and fluid-sediment interaction is not required to explain the plume data.…”

Section: Carbon Isotope Ratio In Endmember Fluidmentioning

confidence: 78%

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Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough

et al. 2010

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Section: H 2 /Ch 4 Ratiomentioning

confidence: 74%

Section: Carbon Isotope Ratio In Endmember Fluidmentioning

confidence: 78%

Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough

et al. 2010

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“…Two segments north of Kairei and 1000 m deeper on the same ridge, the Edmond vent field exhibits some of the lowest hydrogen concentrations that have been reported, 0.02-0.2 mmol kg −1 . A large range of hydrogen concentrations has also been observed on the EPR at 9°50′N, where eruptive events occurred in 1991and 1992[Von Damm and Lilley, 2004Proskurowski et al, 2008a]. The high concentrations occur in the high-temperature vent fluids, and these concentrations decrease in time following the eruptive events.…”

Section: Hydrogen Flux From Mid-ocean Ridgesmentioning

confidence: 95%

A note on the fluxes of abiogenic methane and hydrogen from mid‐ocean ridges

Keir¹

2010

Geophysical Research Letters

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[1] The concentrations of methane and hydrogen in hydrothermal vent fluids issuing from mid-ocean ridges tend to fall into two groups, one with high concentrations of these gases in ultramafic-hosted vent fields and a second group with relatively lower concentrations in basalt-hosted vent fluids. Ultramafic-hosted systems, however, appear to be restricted to slow-spreading ridges and constitute only a fraction of the hydrothermal systems found there. In this note, the hydrothermal fluxes of methane and hydrogen have been calculated by estimating the percentages of the total subsurface hydrothermal circulation that circulate through each type of host rock. Even though the percentage of the total subsurface flow that is affected by serpentinization appears to be rather small (8%), it still appears that this process produces about 70% of the total mid-ocean flux of these gases. The total production of methane and hydrogen is calculated to be about 20 × 10 9 mol yr −1 and 190 × 10 9 mol yr −1 , respectively. The hydrogen flux is comparable to that most recently calculated on the basis of the rate of hydration of mantle rock in newly formed crust and the stoichiometry of the serpentinization reaction. This suggests that, except for the production of methane, a major portion of the hydrogen produced in the subsurface is not consumed before venting. Citation: Keir, R. S.(2010), A note on the fluxes of abiogenic methane and hydrogen from mid-ocean ridges, Geophys.

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“…This method provided the sensitivity to measure the low gas concentrations of background seawater (CH 4 : 0.5-1nM, H 2 : 0.1-0.5 nM). Hydrothermal fluids are enriched in both CH 4 and H 2 (Lilley et al, 1982;Proskurowski et al, 2008).…”

Section: Vent Plume Gsosmentioning

confidence: 99%

Sulfur oxidizers dominate carbon fixation at a biogeochemical hot spot in the dark ocean

et al. 2013

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Bacteria and archaea in the dark ocean (4200 m) comprise 0.3-1.3 billion tons of actively cycled marine carbon. Many of these microorganisms have the genetic potential to fix inorganic carbon (autotrophs) or assimilate single-carbon compounds (methylotrophs). We identified the functions of autotrophic and methylotrophic microorganisms in a vent plume at Axial Seamount, where hydrothermal activity provides a biogeochemical hot spot for carbon fixation in the dark ocean. Free-living members of the SUP05/Arctic96BD-19 clade of marine gamma-proteobacterial sulfur oxidizers (GSOs) are distributed throughout the northeastern Pacific Ocean and dominated hydrothermal plume waters at Axial Seamount. Marine GSOs expressed proteins for sulfur oxidation (adenosine phosphosulfate reductase, sox (sulfur oxidizing system), dissimilatory sulfite reductase and ATP sulfurylase), carbon fixation (ribulose-1,5-bisphosphate carboxylase oxygenase (RuBisCO)), aerobic respiration (cytochrome c oxidase) and nitrogen regulation (PII). Methylotrophs and iron oxidizers were also active in plume waters and expressed key proteins for methane oxidation and inorganic carbon fixation (particulate methane monooxygenase/methanol dehydrogenase and RuBisCO, respectively). Proteomic data suggest that free-living sulfur oxidizers and methylotrophs are among the dominant primary producers in vent plume waters in the northeastern Pacific Ocean.

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Stable isotopic evidence in support of active microbial methane cycling in low-temperature diffuse flow vents at 9°50′N East Pacific Rise

Abstract: 3

Cited by 49 publications

References 99 publications

Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough

Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough

A note on the fluxes of abiogenic methane and hydrogen from mid‐ocean ridges

Sulfur oxidizers dominate carbon fixation at a biogeochemical hot spot in the dark ocean

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