FN Archimer Export Format
PT J
TI Rapid transport and high accumulation of amorphous silica in the Congo deep-sea fan: A preliminary budget
BT 
AF RAIMONET, Melanie
   RAGUENEAU, Olivier
   JACQUES, Vincent
   CORVAISIER, Rudolph
   MORICEAU, Brivaela
   KHRIPOUNOFF, Alexis
   POZZATO, Lara
   RABOUILLE, Christophe
AS 1:1;2:1;3:1;4:1;5:1;6:2;7:3,4;8:3,4;
FF 1:;2:;3:;4:;5:;6:PDG-REM-EEP-LEP;7:;8:;
C1 Inst Univ European Mer, UMR CNRS UBO IRD IFREMER 6539, Lab Sci Environm Marin, F-29280 Plouzane, France.
   IFREMER, Lab Environm Profond, F-29280 Plouzane, France.
   UMR CEA CNRS UVSQ, Lab Sci Climat & Environm, F-91190 Gif Sur Yvette, France.
   IPSL, F-91190 Gif Sur Yvette, France.
C2 UBO, FRANCE
   IFREMER, FRANCE
   UNIV VERSAILLES, FRANCE
   IPSL, FRANCE
SI BREST
SE IUEM
   UBOIUEM
   PDG-REM-EEP-LEP
UM LEMAR
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.174
TC 13
UR https://archimer.ifremer.fr/doc/00251/36242/35797.pdf
LA English
DT Article
CR CONGOLOBE
   WACS
BO Pourquoi pas ?
DE ;Continental margin;Land-sea export;Silica cycle;Congo canyon;Deep-sea fan
AB Mechanisms controlling the transfer and retention of silicon (Si) along continental margins are poorly understood, but play a major role in the functioning of coastal ecosystems and the oceanic biological pump of carbon. Deep-sea fans are well recognized as carbon sink spots, but we lack knowledge about the importance of the fans in the global Si cycle. Here, we provide a first estimate of the role played by the Congo deep-sea fan, one of the biggest in the world, in the Si cycle. Sediment cores sampled in the deep-sea fan were analyzed to build a Si mass balance. An exceptionally high accumulation rate of amorphous silica aSiO(2) (2.29 +/- 0.58 mol Si m(-2) y(-1)) was found, due to a high sedimentation rate and the presence of aluminum in the sediments. Although favored by bioirrigation, recycling fluxes remained low (0.3 mol Si m(-2) y(-1)) and reconstructed input fluxes could only be explained by lateral inputs coming from the canyon. Preliminary calculations show that the rapid transport of aSiO(2) through the canyon and the excellent preservation efficiency in the sediments imply that 50% of aSiO(2) river inputs from the Congo River accumulate annually in the deep-sea fan. Si:C ratios in deep-sea fan sediments were very low (0.2) and only three times as high as those measured in the river itself, which suggests that material from the river and the continental shelf was delivered directly through the canyon, with very little time for Si and C cycle decoupling to take place.
PY 2015
PD JAN
SO Journal Of Marine Systems
SN 0924-7963
PU Elsevier Science Bv
VL 141
UT 000347868800007
BP 71
EP 79
DI 10.1016/j.jmarsys.2014.07.010
ID 36242
ER

EF