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Isotopic composition of dissolved inorganic carbon in subsurface sediments of gas hydrate-bearing mud volcanoes, Lake Baikal: implications for methane and carbonate origin

(2010) GEO-MARINE LETTERS. 30(3-4). p.427-437
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Abstract
We report on the isotopic composition of dissolved inorganic carbon (DIC) in pore-water samples recovered by gravity coring from near-bottom sediments at gas hydrate-bearing mud volcanoes/gas flares (Malenky, Peschanka, Peschanka 2, Goloustnoe, and Irkutsk) in the Southern Basin of Lake Baikal. The δ13C values of DIC become heavier with increasing subbottom depth, and vary between −9.5 and +21.4‰ PDB. Enrichment of DIC in 13C indicates active methane generation in anaerobic environments near the lake bottom. These data confirm our previous assumption that crystallization of carbonates (siderites) in subsurface sediments is a result of methane generation. Types of methanogenesis (microbial methyl-type fermentation versus CO2-reduction) were revealed by determining the offset of δ13C between dissolved CH4 and CO2, and also by using δ13C and δD values of dissolved methane present in the pore waters. Results show that both mechanisms are most likely responsible for methane generation at the investigated locations.
Keywords
ACETATE FERMENTATION, AUTHIGENIC CARBONATES, BOTTOM SEDIMENTS, OXIDATION, SIBERIA, MARINE, WATERS, FRACTIONATION, ENVIRONMENTS, REDUCTION

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Chicago
Krylov, Alexey A, Oleg M Khlystov, Akihiro Hachikubo, Hirotsugu Minami, Yutaka Nunokawa, Hitoshi Shoji, Tamara I Zemskaya, et al. 2010. “Isotopic Composition of Dissolved Inorganic Carbon in Subsurface Sediments of Gas Hydrate-bearing Mud Volcanoes, Lake Baikal: Implications for Methane and Carbonate Origin.” Geo-marine Letters 30 (3-4): 427–437.
APA
Krylov, A. A., Khlystov, O. M., Hachikubo, A., Minami, H., Nunokawa, Y., Shoji, H., Zemskaya, T. I., et al. (2010). Isotopic composition of dissolved inorganic carbon in subsurface sediments of gas hydrate-bearing mud volcanoes, Lake Baikal: implications for methane and carbonate origin. GEO-MARINE LETTERS, 30(3-4), 427–437. Presented at the 9th International Conference on Gas in Marine Sediments.
Vancouver
1.
Krylov AA, Khlystov OM, Hachikubo A, Minami H, Nunokawa Y, Shoji H, et al. Isotopic composition of dissolved inorganic carbon in subsurface sediments of gas hydrate-bearing mud volcanoes, Lake Baikal: implications for methane and carbonate origin. GEO-MARINE LETTERS. 2010;30(3-4):427–37.
MLA
Krylov, Alexey A et al. “Isotopic Composition of Dissolved Inorganic Carbon in Subsurface Sediments of Gas Hydrate-bearing Mud Volcanoes, Lake Baikal: Implications for Methane and Carbonate Origin.” GEO-MARINE LETTERS 30.3-4 (2010): 427–437. Print.
@article{978210,
  abstract     = {We report on the isotopic composition of dissolved inorganic carbon (DIC) in pore-water samples recovered by gravity coring from near-bottom sediments at gas hydrate-bearing mud volcanoes/gas flares (Malenky, Peschanka, Peschanka 2, Goloustnoe, and Irkutsk) in the Southern Basin of Lake Baikal. The δ13C values of DIC become heavier with increasing subbottom depth, and vary between −9.5 and +21.4‰ PDB. Enrichment of DIC in 13C indicates active methane generation in anaerobic environments near the lake bottom. These data confirm our previous assumption that crystallization of carbonates (siderites) in subsurface sediments is a result of methane generation. Types of methanogenesis (microbial methyl-type fermentation versus CO2-reduction) were revealed by determining the offset of δ13C between dissolved CH4 and CO2, and also by using δ13C and δD values of dissolved methane present in the pore waters. Results show that both mechanisms are most likely responsible for methane generation at the investigated locations.},
  author       = {Krylov, Alexey A and Khlystov, Oleg M and Hachikubo, Akihiro and Minami, Hirotsugu and Nunokawa, Yutaka and Shoji, Hitoshi and Zemskaya, Tamara I and Naudts, Lieven and Pogodaeva, Tatyana V and Kida, Masato and Kalmychkov, Gennady V and Poort, Jeffrey},
  issn         = {0276-0460},
  journal      = {GEO-MARINE LETTERS},
  keywords     = {ACETATE FERMENTATION,AUTHIGENIC CARBONATES,BOTTOM SEDIMENTS,OXIDATION,SIBERIA,MARINE,WATERS,FRACTIONATION,ENVIRONMENTS,REDUCTION},
  language     = {eng},
  location     = {Bremen, Germany},
  number       = {3-4},
  pages        = {427--437},
  title        = {Isotopic composition of dissolved inorganic carbon in subsurface sediments of gas hydrate-bearing mud volcanoes, Lake Baikal: implications for methane and carbonate origin},
  url          = {http://dx.doi.org/10.1007/s00367-010-0190-2},
  volume       = {30},
  year         = {2010},
}

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