Origin and fate of deep-sea seeping methane bubbles at Kuroshima Knoll, Ryukyu forearc region, Japan

Tsunogai, Urumu; Kosaka, Ayako; Nakayama, Noriko; Komatsu, Daisuke; Konno, Uta; Kameyama, Sohiko; Nakagawa, Fumiko; Sumino, Hirochika; Nagao, Keisuke; Fujikura, Katsunori; Machiyama, Hideaki

doi:10.2343/geochemj.1.0096

Cited by 22 publications

(8 citation statements)

References 79 publications

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“…As shown in the figure, the δD values showed a strong linear relationship with 1/[H 2 ]. Thus, we concluded that simple mixing between two end‐members having different [H 2 ] and different δD values of H 2 was responsible for the observed large variation in the δD values of H 2 in the plume samples [e.g., Keeling , ; Tsunogai et al ., , , , , , ]. Similar linear relationships between the 1/[H 2 ] and δD values of H 2 have been found in the other volcanic plumes such as those in Aso and Satsuma‐Iwojima volcanoes [ Tsunogai et al ., , ].…”

Section: Resultsmentioning

confidence: 99%

Remote determinations on fumarole outlet temperatures in an eruptive volcano

Tsunogai

Cheng

Ito

et al. 2016

Geophysical Research Letters

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Direct measurement of the fumarole outlet temperature in active volcanoes is impractical. Therefore, we used an aircraft to sample H2 in the volcanic plume ejected from Sakurajima volcano to remotely estimate the highest fumarolic temperatures of the volcano based on hydrogen isotopic fractionation between H2 and magmatic H2O. We successfully estimated that the δD of the fumarolic H2 in September and December 2014 was −135 ± 13‰ and −113 ± 11‰, respectively, and that the corresponding highest outlet temperatures were 1050 ± 120°C and 1199 ± 139°C. Although the temperatures were higher than those determined by using infrared remote sensing, we concluded that they are more reliable estimates of the highest fumarole outlet temperatures. Combined with plume sampling by using aircraft, remote temperature sensing based on the δD of H2 in volcanic plumes can be widely applied to active volcanoes to determine the highest fumarole outlet temperatures.

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Section: Resultsmentioning

confidence: 99%

Remote determinations on fumarole outlet temperatures in an eruptive volcano

Tsunogai

Cheng

Ito

et al. 2016

Geophysical Research Letters

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“…The linear relationships suggested that both the concentrations and the dD values of H 2 in the samples from each site can be explained by simple mixing between two end-members, both of which can be classified to a single category at least for the dD values of H 2 (e.g. Keeling, 1958;Tsunogai et al, 1998Tsunogai et al, , 2003Tsunogai et al, , 2005Tsunogai et al, , 2010. Furthermore, the H 2 -depleted end-member seems to be almost common irrespective of the volcano under study, showing an H 2 concentration of ca.…”

Section: H 2 In the Volcanic Plumesmentioning

confidence: 91%

Hydrogen isotopes in volcanic plumes: Tracers for remote temperature sensing of fumaroles

Tsunogai

Kamimura

Anzai

et al. 2011

Geochimica et Cosmochimica Acta

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In high-temperature volcanic fumaroles (>400°C), the isotopic composition of molecular hydrogen (H 2 ) reaches equilibrium with that of the fumarolic H 2 O. In this study, we used this hydrogen isotope exchange equilibrium of fumarolic H 2 as a tracer for the remote temperature at volcanic fumaroles. In this remote sensing, we deduced the hydrogen isotopic composition (dD value) of fumarolic H 2 from those in the volcanic plume. To ascertain that we can estimate the dD value of fumarolic H 2 from those in a volcanic plume, we estimated the values in three fumaroles with outlet temperatures of 630°C (Tarumae), 203°C (Kuju), and 107°C (E-san). For this we measured the concentration and dD value of H 2 in each volcanic plume, along with those determined directly at each fumarole. The average and maximum mixing ratios of fumarolic H 2 within a plume's total H 2 were 97% and 99% (at Tarumae), 89% and 96% (at Kuju), and 97% and 99% (at E-san). We found a linear relationship between the depletion in the dD values of H 2 , with the reciprocal of H 2 concentration. Furthermore, the estimated end-member dD value for each H 2 -enriched component (À260 ± 30& vs. VSMOW in Tarumae, À509 ± 23& in Kuju, and À437 ± 14& in E-san) coincided well with those observed at each fumarole (À247.0 ± 0.6& in Tarumae, À527.7 ± 10.1& in Kuju, and À432.1 ± 2.5& in E-san). Moreover, the calculated isotopic temperatures at the fumaroles agreed to within 20°C with the observed outlet temperature at Tarumae and Kuju. We deduced that the dD value of the fumarolic H 2 was quenched within the volcanic plume. This enabled us to remotely estimate these in the fumarole, and thus the outlet temperature of fumaroles, at least for those having the outlet temperatures more than 400°C. By applying this methodology to the volcanic plume emitted from the Crater 1 of Mt. Naka-dake (the volcano Aso) where direct measurement on fumaroles was impractical, we estimated that the dD value of the fumarolic H 2 to be À172 ± 16& and the outlet temperature to be 868 ± 97°C. The remote temperature sensing using hydrogen isotopes developed in this study is widely applicable to many volcanic systems.

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“…The geochemical volcanic processes within Kamchatka and the Japanese islands are being studied deeply [59][60][61][62][63]. Methods (which are very important for monitoring the activity of gas emissions and for integrated estimates of gas fluxes) for remote measurements of volcanic gas fluxes (Global Volcanism Program, DOAS, FLYSPEC, etc.)…”

Section: The Research On Gasgeochemical Fields Of the World Oceanmentioning

confidence: 99%

“…Methods for analyzing the stable carbon isotopes. The analysis of stable carbon isotopes of methane and carbon dioxide was performed on a Finnigan MAT -252 mass spectrometer using the CF-IRMS system at Nagoya University, Japan [63]. The mass spectrometric method was used to study the genesis of gasgeochemical fields in these areas.…”

Section: Sediment Samplingmentioning

confidence: 99%

Gasgeochemical features in the western part of the East Vietnam Sea (Bien Dong Sea)

Сырбу

Nguyen

et al. 2022

VJMST

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During the joint Russian-Vietnamese studies in the East Vietnam Sea (known as Bien Dong or the South China Sea), manifestations of new hydrocarbon-accumulating zones were discovered; evidences of the presence of mineral indicators for solid minerals in shelf deposits were obtained; a unique zone, where accumulations of ferromanganese crusts and nodules have been formed, was revealed for the first time; evidence of unique properties of deep-water fine-dispersed carbonate sediments (which makes it possible to attribute them to an independent type of mineral resources of the East Vietnam Sea) were obtained; the ikaite mineral (that serves as an indicator of methane migration zones and cold marine paleo-conditions) was discovered in the Phu Khanh basin; heavy concentrates with indicators of rare forms of ore mineralization were collected; features of methane and mercury fluxes into the atmosphere, cultures of methane-oxidizing, oil-oxidizing and sulfate-reducing bacteria were registered for the first time within the study areas. New data on gravity and magnetic field anomalies along the shelf and slope of Vietnam have been obtained. The article presents the results of coastal geophysical and gasgeochemical research obtained in 2010–2020 within the Joint Russian-Vietnamese Laboratory for Marine Geosciences (POI FEB RAS - IMGG VAST). For the first time, anomalous methane fields (comparable to anomalies on the oil- and gas-bearing shelf and the gas hydrate-bearing slope of Sakhalin Island) were registered in the water column. The gravimagnetic survey was carried out on the central and southern shelf and the continental slope of Vietnam; the executed works supplemented the geophysical data, which had been obtained in the 80s–90s of the preceding century. The paper contributes to the Russia-Vietnamese program within the UN Decade of Ocean Sciences for Sustainable Development framework.

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Origin and fate of deep-sea seeping methane bubbles at Kuroshima Knoll, Ryukyu forearc region, Japan

Cited by 22 publications

References 79 publications

Remote determinations on fumarole outlet temperatures in an eruptive volcano

Remote determinations on fumarole outlet temperatures in an eruptive volcano

Hydrogen isotopes in volcanic plumes: Tracers for remote temperature sensing of fumaroles

Gasgeochemical features in the western part of the East Vietnam Sea (Bien Dong Sea)

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