Microbial carbon isotope fractionation to produce extraordinarily heavy methane in aging hydrothermal plumes over the southwestern Okinawa Trough

Gamo, Toshitaka; Tsunogai, Urumu; Ichibayashi, Shinsuke; Chiba, Hitoshi; Obata, Hajime; Oomori, Tamotsu; Noguchi, Takuro; Baker, Edward T.; Doi, Takashi; Maruo, Masahiro; Sano, Yuji

doi:10.2343/geochemj.1.0097

Cited by 19 publications

(21 citation statements)

References 31 publications

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“…By contrast, East Scotia (German et al, ) and Okinawa Trough (Gamo et al, ) have been surveyed using tows but without benefit of an ORP sensor and with large gaps in coverage. Only two of nine East Scotia BASC segments have been towed, while other segments have been surveyed only with widely spaced vertical casts (Livermore, ).…”

Section: Discussionmentioning

confidence: 99%

The Effect of Arc Proximity on Hydrothermal Activity Along Spreading Centers: New Evidence From the Mariana Back Arc (12.7°N–18.3°N)

Baker

Walker

Chadwick

et al. 2017

Geochem Geophys Geosyst

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Back‐arc spreading centers (BASCs) form a distinct class of ocean spreading ridges distinguished by steep along‐axis gradients in spreading rate and by additional magma supplied through subduction. These characteristics can affect the population and distribution of hydrothermal activity on BASCs compared to mid‐ocean ridges (MORs). To investigate this hypothesis, we comprehensively explored 600 km of the southern half of the Mariana BASC. We used water column mapping and seafloor imaging to identify 19 active vent sites, an increase of 13 over the current listing in the InterRidge Database (IRDB), on the bathymetric highs of 7 of the 11 segments. We identified both high and low (i.e., characterized by a weak or negligible particle plume) temperature discharge occurring on segment types spanning dominantly magmatic to dominantly tectonic. Active sites are concentrated on the two southernmost segments, where distance to the adjacent arc is shortest (<40 km), spreading rate is highest (>48 mm/yr), and tectonic extension is pervasive. Re‐examination of hydrothermal data from other BASCs supports the generalization that hydrothermal site density increases on segments <90 km from an adjacent arc. Although exploration quality varies greatly among BASCs, present data suggest that, for a given spreading rate, the mean spatial density of hydrothermal activity varies little between MORs and BASCs. The present global database, however, may be misleading. On both BASCs and MORs, the spatial density of hydrothermal sites mapped by high‐quality water‐column surveys is 2–7 times greater than predicted by the existing IRDB trend of site density versus spreading rate.

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Section: Discussionmentioning

confidence: 99%

The Effect of Arc Proximity on Hydrothermal Activity Along Spreading Centers: New Evidence From the Mariana Back Arc (12.7°N–18.3°N)

Baker

Walker

Chadwick

et al. 2017

Geochem Geophys Geosyst

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“…Aerobic CH 4 -oxidizing bacteria are known to consume 12 CH 4 preferentially relative to 13 CH 4 to increase the δ 13 C values of the residual CH 4 in seawater (e.g., Coleman et al, 1981;Cowen et al, 2002). Gamo et al (2010) confirmed δ 13 C-CH 4 to be an excellent tracer for aged hydrothermal plumes in the southern Okinawa Trough hydrothermal zone, even after the concentrations of other tracers had dropped to background levels. The δ 13 C-CH 4 was recognized again as a useful hydrothermal tracer for the intermediate plumes in the Gulf of Aden.…”

Section: Intermediate and Deep Plumesmentioning

confidence: 98%

Hydrothermal plumes in the Gulf of Aden, as characterized by light transmission, Mn, Fe, CH4 and δ13C–CH4 anomalies

Gamo

Okamura

Hatanaka

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

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“…#1, 10, 14, 16, 17, 19, 30, 31, 32, 33, 34). Freshwater carbonate deposition is associated with the heavy isotope loss and lower isotopic values of the residual gaseous CO 2 (Hoefs, 2009, Ray et al, 2009 C, related to hydrocarbons and organic matter (organic carbon  13 C ~ -20 to -37 ‰, Hoefs, 2009;Gamo et al, 2010), as well as carbonate precipitation, responsible for the heavy isotope loss, may account for the final isotopic composition of these samples.…”

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confidence: 99%

Geochemistry of dissolved gases from the Eastern Carpathians - Transylvanian Basin boundary

et al. 2017

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We show the results of a study on the volatiles dissolved in mineral waters discharged over a 200 km-long transect along the Rodna-Bârgău area and Călimani-Gurghiu-Harghita volcanic chain (Eastern Carpathians, Romania terms of mixings among different gas sources feeding the groundwater and the contemporary occurrence of gaswater interactions like degassing and deposition of carbonates, affecting the circulating waters after their infiltration.

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Microbial carbon isotope fractionation to produce extraordinarily heavy methane in aging hydrothermal plumes over the southwestern Okinawa Trough

Cited by 19 publications

References 31 publications

The Effect of Arc Proximity on Hydrothermal Activity Along Spreading Centers: New Evidence From the Mariana Back Arc (12.7°N–18.3°N)

The Effect of Arc Proximity on Hydrothermal Activity Along Spreading Centers: New Evidence From the Mariana Back Arc (12.7°N–18.3°N)

Hydrothermal plumes in the Gulf of Aden, as characterized by light transmission, Mn, Fe, CH4 and δ13C–CH4 anomalies

Geochemistry of dissolved gases from the Eastern Carpathians - Transylvanian Basin boundary

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