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Molecular and isotopic composition of hydrate-bound and dissolved gases in the southern basin of Lake Baikal, based on an improved headspace gas method

(2012) GEO-MARINE LETTERS. 32(5-6). p.465-472
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Abstract
Assessments of the molecular and isotopic composition of hydrate-bound and dissolved gases in pore water were conducted during the multi-phase gas hydrate project (MHP-09) cruise VER09-03 to the southern basin of Lake Baikal in September 2009. To avoid changes in gas composition during core sampling and transport, various headspace methods were investigated aimed at preserving the dissolved gases in pore water. When distilled water was added to the sediment samples, the concentrations of carbon dioxide and oxygen decreased because of dissolution into the water and/or microbial consumption. When the headspace was not flushed with inert gases, trace levels of hydrogen and ethylene were detected. The findings suggest that best preparation is achieved by flushing the headspace with helium, and adding a saturated aqueous solution of sodium chloride. This improved headspace method served to examine the molecular and isotopic compositions of gas samples retrieved at several new sites in the southern basin. Methane was the major component, and the proportion of ethane ranged widely from 0.0009 to 1.67 mol% of the total hydrocarbon gases. The proportions of propane and higher hydrocarbons were small or less than their detection limits. The carbon isotope signatures suggest that microbial-sourced methane and ethane were dominant in the Peschanka study area, whereas ethane was of thermogenic origin at all other study sites in the southern basin of Lake Baikal.
Keywords
METHANE, ETHANE, CARBON, SEDIMENTS

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MLA
Sakagami, Hirotoshi, Nobuo Takahashi, Akihiro Hachikubo, et al. “Molecular and Isotopic Composition of Hydrate-bound and Dissolved Gases in the Southern Basin of Lake Baikal, Based on an Improved Headspace Gas Method.” GEO-MARINE LETTERS 32.5-6 (2012): 465–472. Print.
APA
Sakagami, H., Takahashi, N., Hachikubo, A., Minami, H., Yamashita, S., Shoji, H., Khlystov, O., et al. (2012). Molecular and isotopic composition of hydrate-bound and dissolved gases in the southern basin of Lake Baikal, based on an improved headspace gas method. GEO-MARINE LETTERS, 32(5-6), 465–472.
Chicago author-date
Sakagami, Hirotoshi, Nobuo Takahashi, Akihiro Hachikubo, Hirotsugu Minami, Satoshi Yamashita, Hitoshi Shoji, Oleg Khlystov, Gennadiy Kalmychkov, Mikhail Grachev, and Marc De Batist. 2012. “Molecular and Isotopic Composition of Hydrate-bound and Dissolved Gases in the Southern Basin of Lake Baikal, Based on an Improved Headspace Gas Method.” Geo-marine Letters 32 (5-6): 465–472.
Chicago author-date (all authors)
Sakagami, Hirotoshi, Nobuo Takahashi, Akihiro Hachikubo, Hirotsugu Minami, Satoshi Yamashita, Hitoshi Shoji, Oleg Khlystov, Gennadiy Kalmychkov, Mikhail Grachev, and Marc De Batist. 2012. “Molecular and Isotopic Composition of Hydrate-bound and Dissolved Gases in the Southern Basin of Lake Baikal, Based on an Improved Headspace Gas Method.” Geo-marine Letters 32 (5-6): 465–472.
Vancouver
1.
Sakagami H, Takahashi N, Hachikubo A, Minami H, Yamashita S, Shoji H, et al. Molecular and isotopic composition of hydrate-bound and dissolved gases in the southern basin of Lake Baikal, based on an improved headspace gas method. GEO-MARINE LETTERS. 2012;32(5-6):465–72.
IEEE
[1]
H. Sakagami et al., “Molecular and isotopic composition of hydrate-bound and dissolved gases in the southern basin of Lake Baikal, based on an improved headspace gas method,” GEO-MARINE LETTERS, vol. 32, no. 5–6, pp. 465–472, 2012.
@article{3081774,
  abstract     = {Assessments of the molecular and isotopic composition of hydrate-bound and dissolved gases in pore water were conducted during the multi-phase gas hydrate project (MHP-09) cruise VER09-03 to the southern basin of Lake Baikal in September 2009. To avoid changes in gas composition during core sampling and transport, various headspace methods were investigated aimed at preserving the dissolved gases in pore water. When distilled water was added to the sediment samples, the concentrations of carbon dioxide and oxygen decreased because of dissolution into the water and/or microbial consumption. When the headspace was not flushed with inert gases, trace levels of hydrogen and ethylene were detected. The findings suggest that best preparation is achieved by flushing the headspace with helium, and adding a saturated aqueous solution of sodium chloride. This improved headspace method served to examine the molecular and isotopic compositions of gas samples retrieved at several new sites in the southern basin. Methane was the major component, and the proportion of ethane ranged widely from 0.0009 to 1.67 mol% of the total hydrocarbon gases. The proportions of propane and higher hydrocarbons were small or less than their detection limits. The carbon isotope signatures suggest that microbial-sourced methane and ethane were dominant in the Peschanka study area, whereas ethane was of thermogenic origin at all other study sites in the southern basin of Lake Baikal.},
  author       = {Sakagami, Hirotoshi and Takahashi, Nobuo and Hachikubo, Akihiro and Minami, Hirotsugu and Yamashita, Satoshi and Shoji, Hitoshi and Khlystov, Oleg and Kalmychkov, Gennadiy and Grachev, Mikhail and De Batist, Marc},
  issn         = {0276-0460},
  journal      = {GEO-MARINE LETTERS},
  keywords     = {METHANE,ETHANE,CARBON,SEDIMENTS},
  language     = {eng},
  number       = {5-6},
  pages        = {465--472},
  title        = {Molecular and isotopic composition of hydrate-bound and dissolved gases in the southern basin of Lake Baikal, based on an improved headspace gas method},
  url          = {http://dx.doi.org/10.1007/s00367-012-0294-y},
  volume       = {32},
  year         = {2012},
}

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