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  Stromatolitic fabric of authigenic carbonate crusts: result of anaerobic methane oxidation at cold seeps in 4,850 m water depth

Greinert, J., Bohrmann, G., & Elvert, M. (2002). Stromatolitic fabric of authigenic carbonate crusts: result of anaerobic methane oxidation at cold seeps in 4,850 m water depth. International Journal of Earth Sciences, 91(4), 698-711.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D2F1-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-966C-7
Genre: Journal Article

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Elvert2.pdf (Publisher version), 2MB
 
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 Creators:
Greinert, J.1, Author              
Bohrmann, G.2, Author              
Elvert, M.3, Author              
Affiliations:
1Nutrient Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481710              
2HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481702              
3Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481693              

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Free keywords: Aleutian accretionary margin; anaerobic methane oxidation; archaea; fluid seepage; stromatolitic fabric
 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.

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Language(s): eng - English
 Dates: 2002-08
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 13940
ISI: 000177922000010
 Degree: -

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Title: International Journal of Earth Sciences
  Other : Int. J. Earth Sci.
Source Genre: Journal
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Publ. Info: Berlin : Springer-Verlag
Pages: - Volume / Issue: 91 (4) Sequence Number: - Start / End Page: 698 - 711 Identifier: ISSN: 1437-3254
CoNE: https://pure.mpg.de/cone/journals/resource/954925624290