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First discovery and formation process of authigenic siderite from gas hydrate-bearing mud volcanoes in fresh water : Lake Baikal, Eastern Siberia

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Abstract
We report on the first authigenic siderite (FeCO(3)) concretions recovered from near-bottom sediments at gas hydrate-bearing mud volcanoes in fresh water ( Lake Baikal, Eastern Siberia). The carbonates appear as firm 'plate-type' formations at the Malenky mud volcano ( Southern Baikal Basin) and as soft nodules at the K-2 mud volcano ( Central Baikal Basin). Calcium is the main divalent component which substitutes iron in the carbonate lattice ( 7 to 20 mol%). The delta(13)C values of the carbonates (+3.3 to +6.8% at Malenky, and +16.5 to +21.9% PDB at K-2) indicate that their formation is due to methanogenesis. The latter was most likely caused by the microbial methyl-type ( acetate) fermentation that is suggested from the isotopic composition of the accompanying methane hydrates and dissolved methane. General depletion of the siderites in (18)O (-11.6 to -9.9% at Malenky, and -13.9 to -12.3% PDB at K-2) is mainly inherited from the isotope composition of pore water (-15.2 to -15.4% SMOW) at ambient temperature (3.5 degrees C).
Keywords
ISOTOPE FRACTIONATION, BOTTOM SEDIMENTS, OXYGEN ISOTOPE, METHANE, CARBON, BURIAL, IRON

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Chicago
Krylov, Alexey, Oleg Khlystov, Tamara Zemskaya, Hirotsugu Minami, Akihiro Hachikubo, Yutaka Nunokawa, Masato Kida, et al. 2008. “First Discovery and Formation Process of Authigenic Siderite from Gas Hydrate-bearing Mud Volcanoes in Fresh Water : Lake Baikal, Eastern Siberia.” Geophysical Research Letters 35 (5).
APA
Krylov, A., Khlystov, O., Zemskaya, T., Minami, H., Hachikubo, A., Nunokawa, Y., Kida, M., et al. (2008). First discovery and formation process of authigenic siderite from gas hydrate-bearing mud volcanoes in fresh water : Lake Baikal, Eastern Siberia. GEOPHYSICAL RESEARCH LETTERS, 35(5).
Vancouver
1.
Krylov A, Khlystov O, Zemskaya T, Minami H, Hachikubo A, Nunokawa Y, et al. First discovery and formation process of authigenic siderite from gas hydrate-bearing mud volcanoes in fresh water : Lake Baikal, Eastern Siberia. GEOPHYSICAL RESEARCH LETTERS. 2008;35(5).
MLA
Krylov, Alexey, Oleg Khlystov, Tamara Zemskaya, et al. “First Discovery and Formation Process of Authigenic Siderite from Gas Hydrate-bearing Mud Volcanoes in Fresh Water : Lake Baikal, Eastern Siberia.” GEOPHYSICAL RESEARCH LETTERS 35.5 (2008): n. pag. Print.
@article{397379,
  abstract     = {We report on the first authigenic siderite (FeCO(3)) concretions recovered from near-bottom sediments at gas hydrate-bearing mud volcanoes in fresh water ( Lake Baikal, Eastern Siberia). The carbonates appear as firm 'plate-type' formations at the Malenky mud volcano ( Southern Baikal Basin) and as soft nodules at the K-2 mud volcano ( Central Baikal Basin). Calcium is the main divalent component which substitutes iron in the carbonate lattice ( 7 to 20 mol%). The delta(13)C values of the carbonates (+3.3 to +6.8% at Malenky, and +16.5 to +21.9% PDB at K-2) indicate that their formation is due to methanogenesis. The latter was most likely caused by the microbial methyl-type ( acetate) fermentation that is suggested from the isotopic composition of the accompanying methane hydrates and dissolved methane. General depletion of the siderites in (18)O (-11.6 to -9.9% at Malenky, and -13.9 to -12.3% PDB at K-2) is mainly inherited from the isotope composition of pore water (-15.2 to -15.4% SMOW) at ambient temperature (3.5 degrees C).},
  articleno    = {L05405},
  author       = {Krylov, Alexey and Khlystov, Oleg and Zemskaya, Tamara and Minami, Hirotsugu and Hachikubo, Akihiro and Nunokawa, Yutaka and Kida, Masato and Shoji, Hitoshi and Naudts, Lieven and Poort, Jeffrey and Pogodaeva, Tatiana},
  issn         = {0094-8276},
  journal      = {GEOPHYSICAL RESEARCH LETTERS},
  keywords     = {ISOTOPE FRACTIONATION,BOTTOM SEDIMENTS,OXYGEN ISOTOPE,METHANE,CARBON,BURIAL,IRON},
  language     = {eng},
  number       = {5},
  pages        = {6},
  title        = {First discovery and formation process of authigenic siderite from gas hydrate-bearing mud volcanoes in fresh water : Lake Baikal, Eastern Siberia},
  url          = {http://dx.doi.org/10.1029/2007GL032917},
  volume       = {35},
  year         = {2008},
}

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