NDLI: Authigenic carbonates in methane seeps from the Norwegian sea: Mineralogy, geochemistry, and genesis

Content Provider	Springer Nature Link
Author	Lein, A. Yu. Gorshkov, A. I. Pimev, N. V. Bogdav, Yu. A. Vogt, P. Bogdava, O. Yu. Kuptsov, V. M. Ul’yava, N. V. Sagalevich, A. M. Ivav, M. V.
Copyright Year	2000
Abstract	Authigenic carbonates in the caldera of an Arctic (72°N) submarine mud volcano with active CH$_{4}$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 methanetrophic ones in conditions of excess methane, and sulfate reducers developing on hydrogen, which is an intermediate product of microbial CH$_{4}$ oxidation. Isotopically light carbon (δ$^{13}$C$_{av}$ =−28.9%0) of carbon dioxide produced during CH$_{4}$ oxidation is the main carbonate carbon source. Heavy oxygen isotope ratio (δ$^{18}$O$_{av}$ = 5%0) in carbonates is inherited from seawater sulfate. A rapid sulfate reduction (up to 12 mg S dm$^{−3}$ day$^{−1}$) 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. Authigenic carbonates occurring within sediments occur do notin situ. Salinity, as well as CO 3 2− /Ca and Mg/Ca ratios, correspond to the field of nonmagnesian calcium carbonate precipitation. Calcite is the dominant carbonate mineral in the methane seep caldera, where it occurs in the paragenetic association with barite. The radiocarbon age of carbonates is about 10000 yr.
Starting Page	295
Ending Page	310
Page Count	16
File Format	PDF
ISSN	00244902
Journal	Lithology and Mineral Resources
Volume Number	35
Issue Number	4
e-ISSN	16083229
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2000-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineral Resources Mineralogy Sedimentology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Economic Geology

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