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Crystallization of authigenic carbonates in mud volcanoes at Lake Baikal |
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| Authors: | A A Krylov O M Khlystov T I Zemskaya H Minami A Hachikubo H Shoji M Kida T P Pogodaeva L Naudts J Poort |
| Institution: | (1) Kitami Institute of Technology, Kitami, Japan;(2) Institute of Limnology, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia;(3) National Institute of Advanced Industrial Science and Technology, Sapporo, Japan;(4) Renard Center of Marine Geology, Ghent University, Ghent, Belgium |
| Abstract: | This paper presents data on authigenic siderite first found in surface sediments from mud volcanoes in the Central (K-2) and Southern (Malen’kii) basins of Lake Baikal. Ca is the predominant cation, which substitutes Fe in the crystalline lattice of siderite. The enrichment of the carbonates in the 13C isotope (from +3.3 to +6.8‰ for the Malen’kii volcano and from +17.7 to +21.9‰ for K-2) results from the crystallization of the carbonates during methane generation via the bacterial destruction of organic matter (acetate). The overall depletion of the carbonates in 18O is mainly inherited from the isotopic composition of Baikal water. |
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