FN Archimer Export Format
PT J
TI Shallow gas off the Rhone prodelta, Gulf of Lions
BT 
AF GARCIA GARCIA, Ana
   ORANGE, D
   LORENSON, T
   RADAKOVITCH, O
   TESI, T.
   MISEROCCHI, S
   BERNE, Serge
   FRIEND, P.L.
   NITTROUER, C
   NORMAND, Alain
AS 1:1,2;2:1,2;3:3;4:4;5:5;6:5;7:6;8:7;9:8;10:6;
FF 1:;2:;3:;4:;5:;6:;7:PDG-DOP-DCB-GM-LES;8:;9:;10:PDG-DOP-DCB-GM-CTD;
C1 Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA.
   AOA Geophys Inc, Moss Landing, CA 95039 USA.
   US Geol Survey, Menlo Pk, CA 94025 USA.
   CEREGE, F-13545 Aix En Provence, France.
   CNR, ISMAR, I-40129 Bologna, Italy.
   IFREMER, F-29280 Plouzane, France.
   Univ Washington, Sch Oceanog, Seattle, WA 98195 USA.
   Univ Southampton, Sch Ocean & Earth Sci, SOC, Southampton SO14 3ZH, Hants, England.
C2 UNIV CALIF SANTA CRUZ, USA
   AOA GEOPHYS INC, USA
   US GEOL SURVEY, USA
   CEREGE, FRANCE
   CNR, ITALY
   IFREMER, FRANCE
   UNIV WASHINGTON, USA
   UNIV SOUTHAMPTON, UK
SI BREST
SE PDG-DOP-DCB-GM-LES
   PDG-DOP-DCB-GM-CTD
IN WOS Ifremer jusqu'en 2018
   copubli-europe
   copubli-int-hors-europe
IF 2.029
TC 19
TU Aix-Marseille université
   Centre national de la recherche scientifique
   Collège de France
   Institut de recherche pour le développement
UR https://archimer.ifremer.fr/doc/2006/publication-2396.pdf
LA English
DT Article
CR EUROSTRATAFORM - 1
   MARION
   STRATAFORM 1
BO Oceanus
   Le Suroît
DE ;Gulf of Lions;Rhone prodelta;Flood deposits;Biogenic methane;Shallow gas
AB Sediment cores acquired in 2004 off the Rhone prodelta show consistent anomalous methane concentrations of up to 87,440 ppm. Methane compositional and isotopic data support a biogenic origin, although there are a few sites that show strongly depleted delta C-13 values (-53%o PDB) suggesting a mixed source for the gas (biogenic and thermogenic). Anomalous methane concentrations (samples with more than 90 ppm) are discussed and integrated with organic carbon data, sedimentary rates and ADCP profiles. Highest gas concentrations were found directly off the river mouth (20-40 m water depth) and where the IFREMER models point to the thickest accumulation (> 2 m) in response to the Rhone flood event. In areas unaffected by the high flux of organic matter and rapid/thick flood deposition, or in between flood events, the conditions for methanogenesis and gas accumulation have not been met; in these areas, the physical and biological reworking of the surficial sediment may effectively oxidize and mineralize organic matter and limit bacterial methanogenesis in the sub-surface. We propose that in the Rhone prodelta flood deposits deliver significant amounts of terrigenous organic matter that can be rapidly buried, effectively removing this organic matter from aerobic oxidation and biological uptake and leading to the potential for methanogenesis with burial.
PY 2006
PD DEC
SO Marine Geology
SN 0025-3227
PU Elsevier
VL 234
IS 1-4
UT 000243253100013
BP 215
EP 231
DI 10.1016/j.margeo.2006.09.005
ID 2396
ER

EF