FN Archimer Export Format
PT J
TI Widespread active seepage activity on the Nile Deep Sea Fan (offshore Egypt) revealed by high-definition geophysical imagery
BT 
AF DUPRE, Stephanie
   WOODSIDE, John
   KLAUCKE, Ingo
   MASCLE, Jean
   FOUCHER, Jean-Paul
AS 1:1,2;2:2;3:3;4:4;5:1;
FF 1:PDG-DOP-DCB-GM-LGG;2:;3:;4:;5:PDG-DOP-DCB-GM-LGG;
C1 IFREMER, Ctr Brest, Dept Geosci Marines, F-29280 Plouzane, France.
   Vrije Univ Amsterdam, Fac Earth & Life Sci, Sedimentol & Marine Geol Dept, NL-1081 HV Amsterdam, Netherlands.
   IFM, GEOMAR, Leibniz Inst Marine Sci, D-24148 Kiel, Germany.
   Geosci Azur, F-06235 Villefranche Sur Mer, France.
C2 IFREMER, FRANCE
   UNIV VRIJE AMSTERDAM, NETHERLANDS
   IFM GEOMAR, GERMANY
   IRD, FRANCE
SI BREST
SE PDG-DOP-DCB-GM-LGG
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-p187
   copubli-europe
IF 2.517
TC 58
UR https://archimer.ifremer.fr/doc/00013/12457/9766.pdf
LA English
DT Article
CR FANIL
   NAUTINIL
BO Le Suroît
   L'Atalante
DE ;Nile Deep Sea Fan;seepage;backscatter;sidescan sonar;high-resolution;gas chimneys;mud volcanoes;authigenic carbonates
AB Fluid escape structures on the Nile Deep Sea Fan were investigated during the MEDIFLUX MIMES expedition in 2004. Mud volcanoes, pockmarks and authigenic carbonate structures were surveyed for the first time with a high-resolution deep-towed 75 kHz sidescan sonar and a 2-8 kHz Chirp sediment echosounder. In combination with existing multibeam bathymetry and detailed seafloor in situ geological observations, these new data allowed detailed seep analyses. About 60 gas flares were detected acoustically in the water column from the sidescan sonar raw data at water depths from 770 to 1700 m. These gas flares coincide at the seabed with 1) the centres of the mud volcanoes where mud is also extruded, 2) the borders of the mud volcanoes where the emitted gases contribute to the precipitation of authigenic carbonates, and 3) to the edges of broad sheets of authigenic carbonates. Subsurface sediments are commonly disturbed by ascending fluids throughout the delta, with an abundance of seep-related carbonate structures on the seafloor. The feeder channels below mud volcanoes, similar to the gas conduits below the widespread carbonate crust structures and pockmarks, are relatively narrow and, for the vast majority of them, do not exceed a few metres in diameter. The seeps on the Nile Deep Sea Fan clearly follow lineations on the seafloor that we can relate to faults. (C) 2010 Elsevier B.V. All rights reserved.
PY 2010
PD SEP
SO Marine Geology
SN 0025-3227
PU Elsevier Science Bv
VL 275
IS 1-4
UT 000281217300001
BP 1
EP 19
DI 10.1016/j.margeo.2010.04.003
ID 12457
ER

EF