NDLI: Ca and Mg / Ca ratios in Niger Delta sediments : Implications for authigenic carbonate genesis in cold seep environments

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Ca and Mg / Ca ratios in Niger Delta sediments : Implications for authigenic carbonate genesis in cold seep environments

Content Provider	Semantic Scholar
Author	Bayona, German Pierreb, C. Etoubleaua, J. Voisseta, M. Cauquilc, E. Marsseta, T. Sultana, Nazra Drezena, E. Le Fouqueta, Y.
Copyright Year	2007
Abstract	We report on a reconnaissance analysis of the geochemical composition of authigenic carbonates and sediment samples collected from various seepage sites on the Niger deep-sea fan. Our aim has been to investigate whether evidence for the presence of authigenic carbonates and gas hydrates within sediments is discernible from solid-phase sediment geochemistry. We show that sedimentary Sr/Ca and Mg/Ca ratios can be used to infer the presence of authigenic aragonite (Sr-rich) and Mg-rich carbonate phases (high-Mg calcite, dolomite) in cold seep settings. Using Sr/Ca and Mg/Ca ratios, the proportion (wt.%) of authigenic carbonates in Niger Fan sediments can be calculated from a mixing model between sediment fractions of terrigenous material, biogenic calcite, aragonite and high-Mg calcite. This approach was applied to high-resolution geochemical profiles along sediment cores recovered from various cold seep settings (mud volcano, diapirs, pockmarks, gas-hydrate bearing sediments). Our data reveal that authigenic carbonates occur as discrete phases in sediments from gas-hydrate-bearing areas, suggesting that such carbonate-rich sediment layers may represent paleoindicators for ancient methane seepage in marine sediments, possibly associated to gas-hydrate reservoirs.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://archimer.ifremer.fr/doc/2007/publication-2696.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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