@article{PAR00012705,
  title = {{R}apid transport and high accumulation of amorphous silica in the {C}ongo deep-sea fan : a preliminary budget},
  author = {{R}aimonet, {M}. and {R}agueneau, {O}livier and {J}acques, {V}. and {C}orvaisier, {R}. and {M}oriceau, {B}. and {K}hripounoff, {A}. and {P}ozzato, {L}. and {R}abouille, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}echanisms controlling the transfer and retention of silicon ({S}i) along continental margins are poorly understood, but play a major role in the functioning of coastal ecosystems and the oceanic biological pump of carbon. {D}eep-sea fans are well recognized as carbon sink spots, but we lack knowledge about the importance of the fans in the global {S}i cycle. {H}ere, we provide a first estimate of the role played by the {C}ongo deep-sea fan, one of the biggest in the world, in the {S}i cycle. {S}ediment cores sampled in the deep-sea fan were analyzed to build a {S}i mass balance. {A}n exceptionally high accumulation rate of amorphous silica a{S}i{O}(2) (2.29 +/- 0.58 mol {S}i m(-2) y(-1)) was found, due to a high sedimentation rate and the presence of aluminum in the sediments. {A}lthough favored by bioirrigation, recycling fluxes remained low (0.3 mol {S}i m(-2) y(-1)) and reconstructed input fluxes could only be explained by lateral inputs coming from the canyon. {P}reliminary calculations show that the rapid transport of a{S}i{O}(2) through the canyon and the excellent preservation efficiency in the sediments imply that 50% of a{S}i{O}(2) river inputs from the {C}ongo {R}iver accumulate annually in the deep-sea fan. {S}i:{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 {S}i and {C} cycle decoupling to take place.},
  keywords = {{C}ontinental margin ; {L}and-sea export ; {S}ilica cycle ; {C}ongo canyon ; {D}eep-sea fan ; {CONGO} {FLEUVE}},
  booktitle = {},
  journal = {{J}ournal of {M}arine {S}ystems},
  volume = {141},
  numero = {{SI}},
  pages = {71--79},
  ISSN = {0924-7963},
  year = {2015},
  DOI = {10.1016/j.jmarsys.2014.07.010},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00012705},
}