Chemical and isotopic compositions of samples from the Haakon Mosby mud volcano and nearby, supplement to: Lein, Alla Yu; Gorshkov, Anatoly I; Pimenov, Nikolay V; Bogdanov, Yury A; Vogt, Peter R; Bogdanova, Olga Yu; Kuptsov, Vladimir M; Ul'yanova, Nina V; Sagalevich, Anatoly M; Ivanov, Mikhail V (2000): Authigenic carbonates in methane seeps from the Norwegian Sea: Mineralogy, geochemistry, and genesis. Translated from Litologiya i Poleznye Iskopaemye, 2000, 4, 339-354, Lithology and Mineral Resources, 35(4), 295-310

DOI

Authigenic carbonates in the caldera of an Arctic (72°N) submarine mud volcano with active methane-bearing fluid discharge are formed at the bottom surface during anaerobic microbial methane oxidation. The microbial community consists of specific methane-producing bacteria, which act as methanotrophic ones in conditions of excess methane, and sulfate reducers developing on hydrogen, which is an intermediate product of microbial CH4 oxidation. Isotopically light carbon (aver. d13C = -28.9 per mil) of CO2 produced during CH4 oxidation is the main carbonate carbon source. Heavy oxygen isotope ratio (aver. d18O = 5 per mil) in carbonates is inherited from seawater sulfate. Rapid sulfate reduction (up to 12 mg S/dm**3/day) results in total exhausting of sulfate ion in the upper sediment layer (10 cm). Because of this carbonates can only be formed in surface sediments near the water-bottom interface. Salinity as well as CO3/Ca and Mg/Ca ratios correspond to the field of non-magnesian calcium carbonate precipitation. Calcite is the dominant carbonate mineral in the methane seep caldera, where it occurs in the paragenetic association with barite. Radiocarbon age of carbonates is about 10 Ka.

Identifier
DOI http://dx.doi.org/doi:10.1594/PANGAEA.784671
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.784671
Provenance
Creator Kuptsov, Vladimir M;Vogt, Peter R;Lein, Alla Yu;Ivanov, Mikhail V;Bogdanov, Yury A;Gorshkov, Anatoly I;Pimenov, Nikolay V;Ul'yanova, Nina V;Bogdanova, Olga Yu;Sagalevich, Anatoly M
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2000
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Representation
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Coverage
Discipline Earth System Research
Spatial Coverage (72N-72N,15E-15E)