@article{fdi:010053436,
  title = {{G}rain size control of river suspended sediment geochemistry : clues from {A}mazon {R}iver depth profiles},
  author = {{B}ouchez, {J}. and {G}aillardet, {J}. and {F}rance-{L}anord, {C}. and {M}aurice, {L}aurence and {D}utra-{M}aia, {P}oliana},
  editor = {},
  language = {{ENG}},
  abstract = {{R}esidual solid products of erosion display a wide range of size, density, shape, mineralogy, and chemical composition and are hydrodynamically sorted in large river channels during their transport. {W}e characterize the chemical and isotopic variability of river sediments of the {A}mazon {B}asin, collected at different water depths, as a function of grain size. {A}bsolute chemical concentrations and {S}r and {N}d isotopic ratios greatly varies along channel depth. {T}he {A}l/{S}i ratio, tightly linked to grain size distribution, systematically decreases with depth, mostly reflecting dilution by quartz minerals. {A} double-normalization diagram is proposed to correct from dilution effects. {E}lements define fan-shaped patterns and can be classified in three different groups with respect to hydrodynamic sorting during transport in the {A}mazon: (1) "poorly sorted" insoluble elements like {A}l, {F}e, {T}h, and {REE}s, (2) "well-sorted" insoluble elements like {Z}r and {T}i, mainly carried by heavy minerals, and (3) alkali ({N}a to {C}s) and alkali-earth elements ({M}g to {B}a), for which a large variety of patterns is observed, related, for alkali, to their variable affinity for phyllosilicates. {S}r isotopes show that the {A}mazon {R}iver at the mouth is stratified, the {M}adeira- and {S}olimoes-derived sediments being preferentially transported near the channel surface and at depth, respectively. {T}he comparison between the {S}olimoes and {M}adeira rivers shows how the interplay between grain sorting, weathering, and crustal composition controls the composition of the suspended river sediments.},
  keywords = {{A}mazon {R}iver ; suspended sediments ; hydrodynamic sorting ; depth ; profiles ; grain size},
  booktitle = {},
  journal = {{G}eochemistry {G}eophysics {G}eosystems},
  volume = {12},
  numero = {},
  pages = {{Q}03008},
  ISSN = {1525-2027},
  year = {2011},
  DOI = {10.1029/2010gc003380},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053436},
}