STROMATOLITIC FABRIC OF AUTHIGENIC CARBONATE CRUSTS: RESULT OF ANAEROBIC METHANE OXIDATION AT COLD SEEPS IN 4,850 M WATER DEPTH

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dc.contributor.author Greinert J.
dc.contributor.author Bohrmann G.
dc.contributor.author Elvert M.
dc.date.accessioned 2021-05-24T06:54:05Z
dc.date.available 2021-05-24T06:54:05Z
dc.date.issued 2002
dc.identifier https://www.elibrary.ru/item.asp?id=13938668
dc.identifier.citation International Journal of Earth Sciences, 2002, 91, 4, 698-711
dc.identifier.issn 1437-3254
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/28671
dc.description.abstract Methane seepage leads to Mg-calcite and aragonite precipitation at a depth of 4,850 m on the Aleutian accretionary margin. Stromatolitic and oncoid growth structures imply encrustation of microorganisms (microbial mats) in the host sediment with a unique growth direction downward into the sediment, forming crust-shaped lithologies. Biomarker investigations of the residue after carbonate dissolution show strong enrichments in crocetane and archaeol, which contain extremely low delta(13)C values. This indicates the presence of methane-consuming archaea, and delta(13)C values of -42 to -51% PDB indicate that methane is the carbon source for the carbonate crusts. Thus, it appears that stromatolitic encrustations of methanotrophic anaerobic archaea probably occurs in a consortium with sulphate-reducing bacteria and that carbonate precipitation proceeds downward into the sediment, where ascending cold fluids provide a methane source. Strontium and oxygen isotope analyses as well as C-14 ages of the carbonates suggest that the fluids come from deep within the sediment and that carbonate precipitation began about 3,000 years ago.
dc.subject Aleutian accretionary margin
dc.subject Anaerobic methane oxidation
dc.subject Archaea
dc.subject Fluid seepage
dc.subject Stromatolitic fabric
dc.title STROMATOLITIC FABRIC OF AUTHIGENIC CARBONATE CRUSTS: RESULT OF ANAEROBIC METHANE OXIDATION AT COLD SEEPS IN 4,850 M WATER DEPTH
dc.type Статья


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