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| Bayon, Germain; Henderson, G. M.; Bohn, Marcel. |
| On continental margins, oxidation of methane-rich fluids from the sediment often leads to formation of authigenic carbonate pavements on the seafloor. The biogeochemical processes involved during this carbonate precipitation are increasingly understood, but little is known about the duration or mode of carbonate crust formation. Here, we report uranium and thorium concentrations and isotope compositions for a set of 14 samples drilled across an authigenic carbonate pavement, which provide the first stratigraphy for a cold-seep carbonate crust. The 5.5-cm thick crust (NL7-CC2) was collected by Submersible on the Nile deep-sea fan in an area of active fluid venting. U-Th analyses must be corrected for initial Th and measurement of co-existing sediments... |
| Tipo: Text |
Palavras-chave: Nile fan; Cold seeps; Authigenic carbonates; U series. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6450.pdf |
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