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Molecular and isotopic characteristics of gas hydrate-bound hydrocarbons in southern and central Lake Baikal

(2010) GEO-MARINE LETTERS. 30(3-4). p.321-329
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Abstract
We investigated the molecular composition (methane, ethane, and propane) and stable isotope composition (methane and ethane) of hydrate-bound gas in sediments of Lake Baikal. Hydrate-bearing sediment cores were retrieved from eight gas seep sites, located in the southern and central Baikal basins. Empirical classification of the methane stable isotopes (δ13C and δD) for all the seep sites indicated the dominant microbial origin of methane via methyl-type fermentation; however, a mixture of thermogenic and microbial gases resulted in relatively high methane δ13C signatures at two sites where ethane δ13C indicated a typical thermogenic origin. At one of the sites in the southern Baikal basin, we found gas hydrates of enclathrated microbial ethane in which 13C and deuteriumwere both highly depleted (mean δ13C and δD of –61.6‰ V-PDB and –285.4‰ V-SMOW, respectively). To the best of our knowledge, this is the first report of C2 δ13C–δD classification for hydrate-bound gas in either freshwater or marine environments.
Keywords
MARINE, ORIGINS, REDUCTION, HYDROGEN, SUBSURFACE, ETHANE, METHANE, NATURAL GASES, BOTTOM SEDIMENTS, ACETATE FERMENTATION

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Chicago
Hachikubo, Akihiro, Oleg Khlystov, Alexey Krylov, Hirotoshi Sakagami, Hirotsugu Minami, Yutaka Nunokawa, Satoshi Yamashita, et al. 2010. “Molecular and Isotopic Characteristics of Gas Hydrate-bound Hydrocarbons in Southern and Central Lake Baikal.” Geo-marine Letters 30 (3-4): 321–329.
APA
Hachikubo, A., Khlystov, O., Krylov, A., Sakagami, H., Minami, H., Nunokawa, Y., Yamashita, S., et al. (2010). Molecular and isotopic characteristics of gas hydrate-bound hydrocarbons in southern and central Lake Baikal. GEO-MARINE LETTERS, 30(3-4), 321–329. Presented at the 9th International Conference on Gas in Marine Sediments.
Vancouver
1.
Hachikubo A, Khlystov O, Krylov A, Sakagami H, Minami H, Nunokawa Y, et al. Molecular and isotopic characteristics of gas hydrate-bound hydrocarbons in southern and central Lake Baikal. GEO-MARINE LETTERS. 2010;30(3-4):321–9.
MLA
Hachikubo, Akihiro et al. “Molecular and Isotopic Characteristics of Gas Hydrate-bound Hydrocarbons in Southern and Central Lake Baikal.” GEO-MARINE LETTERS 30.3-4 (2010): 321–329. Print.
@article{988764,
  abstract     = {We investigated the molecular composition (methane, ethane, and propane) and stable isotope composition (methane and ethane) of hydrate-bound gas in sediments of Lake Baikal. Hydrate-bearing sediment cores were retrieved from eight gas seep sites, located in the southern and central Baikal basins. Empirical classification of the methane stable isotopes (δ13C and δD) for all the seep sites indicated the dominant microbial origin of methane via methyl-type fermentation; however, a mixture of thermogenic and microbial gases resulted in relatively high methane δ13C signatures at two sites where ethane δ13C indicated a typical thermogenic origin. At one of the sites in the southern Baikal basin, we found gas hydrates of enclathrated microbial ethane in which 13C and deuteriumwere both highly depleted (mean δ13C and δD of –61.6‰ V-PDB and –285.4‰ V-SMOW, respectively). To the best of our knowledge, this is the first report of C2 δ13C–δD classification for hydrate-bound gas in either freshwater or marine environments.},
  author       = {Hachikubo, Akihiro and Khlystov, Oleg and Krylov, Alexey and Sakagami, Hirotoshi and Minami, Hirotsugu and Nunokawa, Yutaka and Yamashita, Satoshi and Takahashi, Nobuo and Shoji, Hitoshi and Nishio, Shin'ya and Kida, Masato and Ebinuma, Takao and Kalmychkov, Gennadiy and Poort, Jeffrey},
  issn         = {0276-0460},
  journal      = {GEO-MARINE LETTERS},
  keywords     = {MARINE,ORIGINS,REDUCTION,HYDROGEN,SUBSURFACE,ETHANE,METHANE,NATURAL GASES,BOTTOM SEDIMENTS,ACETATE FERMENTATION},
  language     = {eng},
  location     = {Bremen, Germany},
  number       = {3-4},
  pages        = {321--329},
  title        = {Molecular and isotopic characteristics of gas hydrate-bound hydrocarbons in southern and central Lake Baikal},
  url          = {http://dx.doi.org/10.1007/s00367-010-0203-1},
  volume       = {30},
  year         = {2010},
}

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