FN Archimer Export Format
PT J
TI Multi-disciplinary investigation of fluid seepage on an unstable margin: The case of the Central Nile deep sea fan
BT 
AF BAYON, Germain
   LONCKE, L.
   DUPRE, Stephanie
   CAPRAIS, Jean-Claude
   DUCASSOU, E.
   DUPERRON, Sebastien
   ETOUBLEAU, Joel
   FOUCHER, Jean-Paul
   FOUQUET, Yves
   GONTHARET, S.
   HENDERSON, G. M.
   HUGUEN, Caroline
   KLAUCKE, I.
   MASCLE, J.
   MIGEON, S.
   OLU-LE-ROY, Karine
   ONDREAS, Helene
   PIERRE, C.
   SIBUET, Myriam
   STADNITSKAIA, A.
   WOODSIDE, J.
AS 1:1;2:2;3:1,3;4:4;5:5;6:6;7:1;8:1;9:1;10:7;11:8;12:9;13:10;14:11;15:11;16:4;17:1;18:7;19:4;20:12;21:3;
FF 1:PDG-DOP-DCB-GM-LGM;2:;3:PDG-DOP-DCB-GM-LGG;4:PDG-DOP-DCB-EEP-LEP;5:;6:PDG-DOP-DCB-EEP-LEP;7:PDG-DOP-DCB-GM-LGM;8:PDG-DOP-DCB-GM-LGG;9:PDG-DOP-DCB-GM-LGM;10:;11:;12:;13:;14:;15:;16:;17:PDG-DOP-DCB-GM-LGM;18:;19:;20:;21:;
C1 IFREMER, Dept Geosci Marines, Brest, France.
   Univ Picardie Jules Verne, UMR 8110, Amiens, France.
   Vrije Univ Amsterdam, Sedimentol & Marine Geol Dept, Amsterdam, Netherlands.
   IFREMER, Dept Etud Ecosyst Profonds, Brest, France.
   Univ Bordeaux 1, EPOC, UMR 5805, F-33405 Talence, France.
   Univ Paris 06, UMR 7138, Paris, France.
   Univ Paris 06, LOCEAN, Paris, France.
   Univ Oxford, Dept Earth Sci, Oxford OX1 2JD, England.
   Univ Perpignan, LEGEM, F-66025 Perpignan, France.
   IFM GEOMAR, Kiel, Germany.
   Geosci Azur UMR 6526, Villefranche Sur Mer, France.
   Royal Netherlands Inst Sea res, Texel, Netherlands.
C2 IFREMER, FRANCE
   UNIV PICARDIE JULES VERNE, FRANCE
   UNIV VRIJE AMSTERDAM, NETHERLANDS
   IFREMER, FRANCE
   UNIV BORDEAUX, FRANCE
   UNIV PARIS 06, FRANCE
   UNIV PARIS 06, FRANCE
   UNIV OXFORD, UK
   UNIV PERPIGNAN, FRANCE
   IFM GEOMAR, GERMANY
   UNIV PARIS 06, FRANCE
   INST SEA RESEARCH (NIOZ), NETHERLANDS
SI BREST
SE PDG-DOP-DCB-GM-LGM
   PDG-DOP-DCB-GM-LGG
   PDG-DOP-DCB-EEP-LEP
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 2.521
TC 76
TU Centre national de la recherche scientifique
   Institut de recherche pour le développement
   Muséum national d'histoire naturelle
   Université Nice - Sophia-Antipolis
   Université Pierre et Marie Curie
   Université de Bordeaux
   Université de Perpignan - Via Domitia
   Université des Antilles
   École pratique des hautes études
UR https://archimer.ifremer.fr/doc/2009/publication-6586.pdf
LA English
DT Article
CR FANIL
   MD 138 / VANIL
   MIMES
   NAUTINIL
   PRISMED2
BO Le Suroît
   Marion Dufresne
   Pelagia
   L'Atalante
DE ;Authigenic carbonate;U Th;Cold seep;Continental margin;Nile
AB We report on a multidisciplinary study of cold seeps explored in the Central Nile deep-sea fan of the Egyptian margin. Our approach combines in situ seafloor observation, geophysics, sedimentological data, measurement of bottom-water methane anomalies, pore-water and sediment geochemistry, and Th-230/U dating of authigenic carbonates. Two areas were investigated, which correspond to different sedimentary provinces. The lower slope, at similar to 2100 m water depth, indicates deformation of sediments by gravitational processes, exhibiting slope-parallel elongated ridges and seafloor depressions. In contrast, the middle slope, at similar to 1650 m water depth, exhibits a series of debris-flow deposits not remobilized by post-depositional gravity processes. Significant differences exist between fluid-escape structures from the two studied areas. At the lower slope, methane anomalies were detected in bottom-waters above the depressions, whereas the adjacent ridges show a frequent coverage of fractured carbonate pavements associated with chemosynthetic vent communities. Carbonate U/Th age dates (similar to 8 kyr BP), pore-water sulphate and solid phase sediment data suggest that seepage activity at those carbonate ridges has decreased over the recent past. In contrast, large (similar to 1 km(2)) carbonate-paved areas were discovered in the middle slope, with U/Th isotope evidence for ongoing carbonate precipitation during the Late Holocene (since similar to 5 kyr BP at least). Our results suggest that fluid venting is closely related to sediment deformation in the Central Nile margin. It is proposed that slope instability leads to focused fluid flow in the lower slope and exposure of 'fossil' carbonate ridges, whereas pervasive diffuse flow prevails at the unfailed middle slope.
PY 2009
PD JUL
SO Marine Geology
SN 0025-3227
PU Elsevier
VL 261
IS 1-4
UT 000267312700008
BP 92
EP 104
DI 10.1016/j.margeo.2008.10.008
ID 6586
ER

EF