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

Alexey Krylov, Oleg Khlystov, Tamara Zemskaya, Hirotsugu Minami, Akihiro Hachikubo, Yutaka Nunokawa, Masato Kida, Hitoshi Shoji, Lieven Naudts, Jeffrey Poort, Tatiana Pogodaeva

Результат исследований: Научные публикации в периодических изданияхстатья

21 Цитирования (Scopus)

Аннотация

We report on the first authigenic siderite (FeCO3) 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 δ 13C 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 18O (-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°C).

Язык оригиналаанглийский
Номер статьиL05405
ЖурналGeophysical Research Letters
Том35
Номер выпуска5
DOI
СостояниеОпубликовано - 16 мар 2008

Предметные области Scopus

  • Геофизика
  • Планетоведение и науки о земле (все)

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  • Цитировать

    Krylov, A., Khlystov, O., Zemskaya, T., Minami, H., Hachikubo, A., Nunokawa, Y., Kida, M., Shoji, H., Naudts, L., Poort, J., & Pogodaeva, T. (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), [L05405]. https://doi.org/10.1029/2007GL032917