FN Archimer Export Format
PT J
TI Authigenic carbonates from methane seeps of the Congo deep-sea fan
BT 
AF PIERRE, Catherine
   FOUQUET, Yves
AS 1:1;2:2;
FF 1:;2:PDG-DOP-DCB-GM-LGM;
C1 UPMC, UMR 7159, LOCEAN, F-75252 Paris 05, France.
   IFREMER, Geosci Marines, Technopole Iroise, F-29280 Plouzane, France.
C2 UNIV PARIS 06, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-GM-LGM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 0.811
TC 58
TU Centre national de la recherche scientifique
   Institut de recherche pour le développement
   Muséum national d'histoire naturelle
   Université Pierre et Marie Curie
UR https://archimer.ifremer.fr/doc/2007/publication-2608.pdf
LA English
DT Article
CR BIOZAIRE 1
   BIOZAIRE 3
   ZAIANGO-BIOL2
   ZAIANGO1
   ZAIANGO2
BO Unknown
   Anchored Buoy
   Thalassa
   L'Atalante
DE ;oxygen isotopes;carbon isotopes;Congo deep sea fan;gas hydrate;methane seep;authigenic carbonate
AB Submersible investigations with the ROV Victor 6000 of some pockmark structures on the seafloor of the Congo deep-sea fan have shown that they are active venting sites of methane-rich fluids, associated with abundant fauna and carbonate crusts. Moreover, methane hydrates have been observed both outcropping and deep in the sediments in the centre of the "Regab" giant pockmark. Authigenic carbonates, mostly calcite sometimes mixed with aragonite, are cementing the sedimentary matrix components and fauna; diatoms are abundant but only as moulds, indicating that biogenic silica dissolution occurred in situ synchronous with carbonate precipitation. The occurrence of diagenetic barite and pyrite in some carbonate crusts demonstrates that they can be formed either within the sulphate/methane transition zone or deeper in sulphate-depleted sediments. The oxygen isotopic compositions of the diagenetic carbonates (3.17-6.01 parts per thousand V-PDB) indicate that precipitation occurred with bottom seawater mixed with a variable contribution of water from gas hydrate decomposition. The very low carbon isotopic compositions of the diagenetic carbonates (-57.1 to -27.75 parts per thousand V-PDB) demonstrate that carbon derives mostly from the microbial oxidation of methane.
PY 2007
PD JUL
SO Geo-Marine Letters
SN 0276-0460
PU Springer
VL 27
IS 2-4
UT 000247204200017
BP 249
EP 257
DI 10.1007/s00367-007-0081-3
ID 2608
ER

EF