FN Archimer Export Format
PT J
TI Early diagenesis in the sediments of the Congo deep-sea fan dominated by massive terrigenous deposits: Part III – Sulfate- and methane- based microbial processes
BT 
AF PASTOR, Lucie
   TOFFIN, Laurent
   DECKER, Carole
   OLU, Karine
   CATHALOT, Cecile
   LESONGEUR, Francoise
   CAPRAIS, Jean-Claude
   BESSETTE, Sandrine
   BRANDILY, Christophe
   TAILLEFERT, M.
   RABOUILLE, C.
AS 1:1;2:2,3,4;3:1;4:1;5:5;6:2,3,4;7:1;8:2,3,4;9:1;10:6;11:7,8;
FF 1:PDG-REM-EEP-LEP;2:PDG-REM-EEP-LMEE;3:PDG-REM-EEP-LEP;4:PDG-REM-EEP-LEP;5:PDG-REM-GM-LCG;6:PDG-REM-EEP-LMEE;7:PDG-REM-EEP-LEP;8:PDG-REM-EEP-LMEE;9:PDG-REM-EEP-LEP;10:;11:;
C1 IFREMER, Ctr Bretagne, Lab Environm Profond, REM EEP, F-29280 Plouzane, France.
   IFREMER, Ctr Bretagne, REM EEP, Lab Microbiol Environm Extremes, F-29280 Plouzane, France.
   Univ Bretagne Occidentale, Lab Microbiol Environm Extremes, UMR6197, Technopole Brest Iroise, Plouzane, France.
   CNRS, Lab Microbiol Environm Extremes, UMR6197, Technopole Brest Iroise, Plouzane, France.
   IFREMER, Ctr Bretagne, REM EEP, Lab Cycles Geochim & Ressources, F-29280 Plouzane, France.
   Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA.
   UMR 8212 CEA CNRS UVSQ, Lab Sci Climat & Environm, Av Terrasse, F-91190 Gif Sur Yvette, France.
   IPSL, Av Terrasse, F-91190 Gif Sur Yvette, France.
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   UBO, FRANCE
   CNRS, FRANCE
   IFREMER, FRANCE
   GEORGIA INST TECHNOL, USA
   LSCE, FRANCE
   IPSL, FRANCE
SI BREST
SE PDG-REM-EEP-LEP
   PDG-REM-EEP-LMEE
   PDG-REM-GM-LCG
UM BEEP-LM2E
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 2.451
TC 12
UR https://archimer.ifremer.fr/doc/00376/48767/49164.pdf
LA English
DT Article
CR WACS
BO Pourquoi pas ?
AB Geochemical profiles (SO42-, H2S, CH4, δ13CH4) and phylogenetic diversity of Archaea and Bacteria from two oceanographic cruises dedicated to the lobes sediments of the Congo deep-sea fan are presented in this paper. In this area, organic-rich turbidites reach 5000 m and allow the establishment of patchy cold-seep-like habitats including microbial mats, reduced sediments, and vesicomyid bivalves assemblages. These bivalves live in endosymbiosis with sulfur-oxidizing bacteria and use sulfides to perform chemosynthesis. In these habitats, unlike classical abyssal sediments, anoxic processes are dominant. Total oxygen uptake fluxes and methane fluxes measured with benthic chambers are in the same range as those of active cold-seep environments, and oxygen is mainly used for reoxidation of reduced compounds, especially in bacterial mats and reduced sediments. High concentrations of methane and sulfate co-exist in the upper 20 cm of sediments, and evidence indicates that sulfate-reducing microorganisms and methanogens co-occur in the shallow layers of these sediments. Simultaneously, anaerobic oxidation of methane (AOM) with sulfate as the electron acceptor is evidenced by the presence of ANMEs (ANaerobic MEthanotroph). Dissolved sulfide produced through the reduction of sulfate is reoxidized through several pathways depending on the habitat. These pathways include vesicomyid bivalves uptake (adults or juveniles in the bacterial mats habitats), reoxidation by oxygen or iron phases within the reduced sediment, or reoxidation by microbial mats. Sulfide uptake rates by vesicomyids measured in sulfide-rich sea water (90 ± 18 mmol S m-2 d-1) were similar to sulfide production rates obtained by modelling the sulfate profile with different bioirrigation constants, highlighting the major control of vesicomyids on sulfur cycle in their habitats.
PY 2017
PD AUG
SO Deep-sea Research Part Ii-topical Studies In Oceanography
SN 0967-0645
PU Pergamon-elsevier Science Ltd
VL 142
UT 000408783500010
BP 139
EP 150
DI 10.1016/j.dsr2.2017.03.011
ID 48767
ER

EF