FN Archimer Export Format
PT J
TI Sr/Ca and Mg/Ca ratios in Niger Delta sediments: Implications for authigenic carbonate genesis in cold seep environments
BT 
AF BAYON, Germain
   PIERRE, C
   ETOUBLEAU, Joel
   VOISSET, Michel
   CAUQUIL, E
   MARSSET, Tania
   SULTAN, Nabil
   LE DREZEN, Eliane
   FOUQUET, Yves
AS 1:1;2:2;3:1;4:1;5:3;6:1;7:1;8:1;9:1;
FF 1:PDG-DOP-DCB-GM-LGM;2:;3:PDG-DOP-DCB-GM-LGM;4:PDG-DOP-DCB-GM-CTD;5:;6:PDG-DOP-DCB-GM-LES;7:PDG-DOP-DCB-GM-LES;8:PDG-DOP-DCB-GM-CTD;9:PDG-DOP-DCB-GM-LGM;
C1 IFREMER, Dept Geosci Marines, Brest, France.
   Univ Paris 06, LOCEAN, Paris, France.
   TOTAL, Paris, France.
C2 IFREMER, FRANCE
   UNIV PARIS 06, FRANCE
   TOTAL, FRANCE
SI BREST
SE PDG-DOP-DCB-GM-LGM
   PDG-DOP-DCB-GM-CTD
   PDG-DOP-DCB-GM-LES
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.975
TC 112
UR https://archimer.ifremer.fr/doc/2007/publication-2696.pdf
LA English
DT Article
DE ;Niger Delta;Gas hydrates;Cold seeps;Mg/Ca;Sr/Ca;Authigenic carbonates
AB 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 paleo-indicators for ancient methane seepage in marine sediments, possibly associated to gas-hydrate reservoirs. (C) 2007 Elsevier B.V. All rights reserved.
PY 2007
PD JUL
SO Marine Geology
SN 0025-3227
PU Elsevier
VL 241
IS 1-4
UT 000247737200007
BP 93
EP 109
DI 10.1016/j.margeo.2007.03.007
ID 2696
ER

EF