Chemical and isotopic compositions of samples from the Haakon Mosby mud volcano and nearby

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 methanotroph...

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Bibliographic Details
Main Authors: 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
Format: Dataset
Language:English
Published: PANGAEA 2000
Subjects:
Akademik Mstislav Keldysh
AMK40
AMK40-3745-M1-1
AMK40-3745-M1-7
AMK40-3754-M2-3
AMK40-3776-M1-1
Archive of Ocean Data
ARCOD
GC
Grab
Gravity corer
MIR-1
MIR-1 deep-sea manned submersible
MIR-2
MIR-2 deep-sea manned submersible
Norwegian Sea
PL15
PL15-22
PL15-30
PL15-32
PL15-36
PL15-45
Professor Logachev
Arctic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.784671
https://doi.org/10.1594/PANGAEA.784671
Description
Summary: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.

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