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

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

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3505405k&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 5, CiteID L05405

Physics

3

Geochemistry: Stable Isotope Geochemistry (0454, 4870), Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Biogeosciences: Limnology (1845, 4239, 4942), Mineralogy And Petrology: Sedimentary Petrology

Scientific paper

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).

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