Influence of the carbon isotopic composition of methane and the proportion of methane-derived bicarbonate on the 13C/12C ratio of dissolved inorganic carbon at the sulfate–methane transition in the Joetsu Basin area, eastern margin of the Sea of Japan

Hiruta, Akihiro; Ishizaki, O.; Tuchinaga, Kazuhiro; Snyder, G. T.; Matsumoto, Ryo

doi:10.1016/j.marpetgeo.2015.05.004

Cited by 10 publications

(15 citation statements)

References 52 publications

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“…If the coexistence of two sI hydates was due to heterogeneous formation, then the considerable difference between the carbon isotopic ratios for samples J23R-3P(I) and J23R-3P(C) would not have been observed. From a laboratory study, no isotopic fractionation of CH 4 was observed . As described above, the difference in crystal textures (icy and columnar shape) implies different formation conditions.…”

Section: Resultsmentioning

confidence: 92%

“…The carbon isotopic ratio δ 13 C of CH 4 molecules from hydrate dissociation were −37.9 and −58.6‰ (Vienna Pee Dee Belemnite, hereafter VPDB) in samples J23R-3P(I) and J23R-3P(C), respectively (Table S1). Massive hydrate samples collected near the J23R-3P well also exhibited a ratio of approximately −35 ‰ (VPDB) . If the coexistence of two sI hydates was due to heterogeneous formation, then the considerable difference between the carbon isotopic ratios for samples J23R-3P(I) and J23R-3P(C) would not have been observed.…”

Section: Resultsmentioning

confidence: 99%

“…From a laboratory study, no isotopic fractionation of CH 4 was observed. 64 As described above, the difference in crystal textures (icy and columnar shape) implies different formation conditions. The isotopic results and crystal appearance suggest that the CH 4 molecules in the J23R-3P(C) crystals would originate from different CH 4 sources than those in sample J23R-3P(I) and other massive hydrates near the J23R-3P well.…”

Section: ■ Experimentsmentioning

confidence: 94%

“…Massive hydrate samples collected near the J23R-3P well also exhibited a ratio of approximately −35 ‰ (VPDB). 64 If the coexistence of two sI hydates was due to heterogeneous formation, then the considerable difference between the carbon isotopic ratios for samples J23R-3P(I) and J23R-3P(C) would not have been observed. From a laboratory study, no isotopic fractionation of CH 4 was observed.…”

Section: ■ Experimentsmentioning

confidence: 99%

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Natural Gas Hydrates Recovered from the Umitaka Spur in the Joetsu Basin, Japan: Coexistence of Two Structure-I Hydrates with Distinctly Different Textures and Gas Compositions within a Massive Structure

Jin

Kida

Yoneda

et al. 2019

ACS Earth Space Chem.

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This study evaluated natural gas hydrates recovered from three different wells (J13R, J07RB, and J23R) at the Umitaka Spur in the Joetsu Basin, via Raman spectroscopy. The hydrates in two of the samples (J13R-13P and J07RB-5P) were of the particle displacement type, whereas sample J23R-3P displayed hydrates of the massive type. The hydrate crystals in all three samples contained a structure-I (sI) hydrate that primarily captures methane (CH 4) molecules with ethane (C 2 H 6), carbon dioxide (CO 2), and/or hydrogen sulfide (H 2 S), which were observable using powder X-ray diffraction and Raman spectroscopy techniques. In the massive type J23R-3P sample, two hydrate crystals with different textures were found to coexist, with one displaying an icy appearance and the other a columnar shape. Interestingly, the icy J23R-3P crystals were sI hydrates containing mostly CH 4 with C 2 H 6 , CO 2 , and H 2 S, whereas the columnar J23R-3P crystals were sI CH 4 hydrates containing few other guest molecules. The coexistence of two different hydrates was not observed in the nodule type sediment (J13R-13P and J07RB-5P). Isotopic results suggested that the CH 4 molecules in the icy and columnar J23R-3P crystals originated from different CH 4 sources. Different sI crystals coexisting in the same sample would be because of high CH 4 flux, a known feature in the Umitaka Spur.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: ■ Experimentsmentioning

confidence: 94%

Section: ■ Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Natural Gas Hydrates Recovered from the Umitaka Spur in the Joetsu Basin, Japan: Coexistence of Two Structure-I Hydrates with Distinctly Different Textures and Gas Compositions within a Massive Structure

Jin

Kida

Yoneda

et al. 2019

ACS Earth Space Chem.

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“…Anaerobic oxidation of methane (AOM) has been shown to influence the isotopic composition of dissolved inorganic carbon in the pore waters of shallow sediments associated with gas seep sites as has been the well documented in the Japan Sea. Sediment pore waters associated with AOM at gas chimney sites in Umitaka Spur, for example, yield δ 13 C values of around −40‰ (Hiruta et al, 2015). The fate of methane in the water column is not well understood, although the implications are important given it is the potential of methane as a greenhouse gas.…”

Section: Introduction Backgroundmentioning

confidence: 99%

Ocean Dynamics and Methane Plume Activity in Tatar Strait, Far Eastern Federal District, Russia as Revealed by Seawater Chemistry, Hydroacoustics, and Noble Gas Isotopes

et al. 2022

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This investigation presents methane, noble gas isotopes, CTD, and stable isotopic data for water samples collected in Niskin bottles at Tatar Strait during the spring seasons of 2015 and 2019 onboard the Russian R/V Akademik M.A. Lavrentyev. The results are compared to previous research carried out in 1999 in a nearby portion of the Strait and demonstrate that salinity and temperature can change appreciably. The CTD data from 1999 shows warm surface waters underlain by cold subsurface waters. In contrast, the 2015 data show the CTD data that show warm temperatures and high salinity extending down from the surface well into intermediate waters, while the 2019 data show cold surface waters underlain by even colder subsurface waters. CTD data collected above active gas plume sites along Sakhalin Island’s western shore show no substantial difference in temperature or salinity from the non-plume sites, and the methane concentrations at all of the measured sites are significantly above saturation, even in the shallow waters. Hydroacoustic data also suggest the presence of free gas and gas hydrate–coated methane bubbles from the seafloor at least to the base of upper intermediate waters. All of the intermediate and deep Japan Sea Proper waters in Tatar Strait still retain tritiogenic 3He, similar to that observed throughout much of the Japan Sea, indicating limited vertical exchange between these layers and surface waters. An analysis of the δ13C of dissolved inorganic carbon in the seawater shows that positive values are limited to surface waters and that the waters become progressively more depleted in 13C with depth. The results are consistent with research over the past several decades which has shown that ventilation of intermediate and deep Japan Sea Proper water is somewhat limited, while both the temperature and salinity of surface and subsurface water layers within the strait are sensitive to the balance between cold, less saline waters contributed by the Amur River/Primorye Current from the north and warm, saline waters contributed by the Tsushima Current from the south.

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Massive gas hydrates buried on Umitaka Spur in the Sea of Japan: description, origin, and significance to methane cycling in marine sediment

Hiruta

Matsumoto²

2022

Geo-Mar Lett

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Influence of the carbon isotopic composition of methane and the proportion of methane-derived bicarbonate on the 13C/12C ratio of dissolved inorganic carbon at the sulfate–methane transition in the Joetsu Basin area, eastern margin of the Sea of Japan

Cited by 10 publications

References 52 publications

Natural Gas Hydrates Recovered from the Umitaka Spur in the Joetsu Basin, Japan: Coexistence of Two Structure-I Hydrates with Distinctly Different Textures and Gas Compositions within a Massive Structure

Natural Gas Hydrates Recovered from the Umitaka Spur in the Joetsu Basin, Japan: Coexistence of Two Structure-I Hydrates with Distinctly Different Textures and Gas Compositions within a Massive Structure

Ocean Dynamics and Methane Plume Activity in Tatar Strait, Far Eastern Federal District, Russia as Revealed by Seawater Chemistry, Hydroacoustics, and Noble Gas Isotopes

Massive gas hydrates buried on Umitaka Spur in the Sea of Japan: description, origin, and significance to methane cycling in marine sediment

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