@article{fdi:010072872,
  title = {{F}ate of particulate copper and zinc isotopes at the {S}olimoes-{N}egro river confluence, {A}mazon {B}asin, {B}razil},
  author = {{G}uinoiseau, {D}. and {B}ouchez, {J}. and {G}elabert, {A}. and {L}ouvat, {P}. and {M}oreira {T}urcq, {P}atricia and {F}ilizola, {N}. and {B}enedetti, {M}. {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he behaviour and fate of copper ({C}u) and zinc ({Z}n) at river confluences is poorly understood, although chemical and physical processes during mixing of compositionally different tributaries might condition metal availability and fluxes to the ocean. {T}o identify and quantify the effect of such processes in river mixing zones, particulate {C}u and {Z}n isotope signatures (delta(65) {C}u-{SPM} and delta {Z}n-66({SPM})) were measured along cross sections and vertical profiles at the largest river confluence in the world, the "{E}ncontro das {A}guas" mixing zone of the {A}mazon {R}iver, where the organic-rich {N}egro {R}iver meets the sediment-rich {S}olimoes {R}iver. {T}he {N}egro {R}iver suspended sediments, with highly variable {C}u and {Z}n concentrations as well as delta {C}u-65({SPM}) and delta(66) {Z}n-{SPM}, are mostly influenced by organic matter and by the lateritic cover of the watershed. {T}he {S}olimoes {R}iver suspended sediments, more homogeneous in {C}u and {Z}n concentration and isotope composition across the river section, reflect the signature of weathered silicate-rich sediments derived from the {A}ndes. {T}he {S}olimoes {R}iver supplies the majority of the suspended {C}u and {Z}n to the {A}mazon {R}iver, and despite important flux losses across the confluence (-35% for {C}u and -27% for {Z}n), delta(65) {C}u-{SPM} and delta(66) {Z}n-{SPM} show a conservative behaviour during the mixing. {I}n the dissolved load, {C}u concentrations and delta(65) {C}u-diss, mostly supplied by the {S}olimoes {R}iver, behave conservatively whereas {Z}n, derived mainly from the {N}egro {R}iver, suffers an important loss ( -58%) that can be attributed to {Z}n adsorption onto the suspended sediments from the {S}olimoes {R}iver. {T}his transfer does not induce a significant delta(66) {Z}n-{SPM} shift in the {A}mazon {R}iver suspended sediments. {T}herefore, {C}u and {Z}n isotope ratios in the suspended sediments behave conservatively through this confluence, which mixes two very chemically-contrasted rivers. {O}ur findings thus suggest that the riverine isotopic information on the sources of particulate {C}u and {Z}n is preserved during tributary mixing.},
  keywords = {{A}mazon {R}iver ; {C}opper isotopes ; {Z}inc isotopes ; {R}iver confluence ; {BRESIL} ; {SOLIMOES} {COURS} {D}'{EAU} ; {NEGRO} {COURS} {D}'{EAU} ; {AMAZONE} {BASSIN}},
  booktitle = {},
  journal = {{C}hemical {G}eology},
  volume = {489},
  numero = {},
  pages = {1--15},
  ISSN = {0009-2541},
  year = {2018},
  DOI = {10.1016/j.chemgeo.2018.05.004},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072872},
}