@article{fdi:010066004,
  title = {{G}eochemistry of organic-rich river waters in {A}mazonia : insights on weathering processes of intertropical cratonic terrain},
  author = {{H}orbe, {A}. {M}. {C}. and {L}ages, {A}. {D}. and {M}oquet, {J}. {S}. and {S}antos, {R}. {V}. and {S}eyler, {P}atrick and {C}ochonneau, {G}{\'e}rard},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n this study, eight organic-rich rivers that flow through the {B}razilian craton in the southwestern {A}mazon rainforest are investigated. {T}his investigation is the first of its type in this area and focuses on the effects of lithology, long-term weathering, thick soils, forest cover and hydrological period on the dissolved load compositions in rivers draining cratonic terrain. {T}he major dissolved ion concentrations, alkalinity ({TA}lk), {S}i{O}2, trace element concentrations, and {S}r isotope contents in the water were determined between {A}pril 2009 and {J}anuary 2010. {I}n addition, the isotopic values of oxygen and hydrogen were determined between 2011 and 2013. {O}verall, the river water is highly dilute and dominated by the major dissolved elements {TA}lk, {S}i{O}2 and {K}+ and the major dissolved trace elements {A}l, {F}e, {B}a, {M}n, {P}, {Z}n and {S}r, which exhibit large temporal and spatial variability and are closely correlated with the silicatic bedrock and hydrology. {A}dditionally, rainwater and recycled water vapor and the size of the basin contribute to the geochemistry of the waters. {T}he total weathering flux estimated from our results is 2-4 t km(-2).yr(-1), which is one of the lowest fluxes in the world. {T}he {CO}2 consumption rate is approximately 21 -61 10(3) mol km(-2)yr(-1), which is higher than expected given the stability of the felsic to basic igneous and metamorphic to siliciclastic basement rocks and the thick tropical soil cover. {T}hus, weathering of the cratonic terrain under intertropical humid conditions is still an important consumer of {CO}2.},
  keywords = {{T}race elements ; {S}r isotopes ; {O} and {D} isotopes ; {W}eathering rates ; {CO}2 consumption rate ; {AMAZONIE} ; {BRESIL} ; {ARIPUANA} {BASSIN} {VERSANT} ; {SUCUNDURI} {BASSIN} {VERSANT}},
  booktitle = {},
  journal = {{A}pplied {G}eochemistry},
  volume = {65},
  numero = {},
  pages = {22--35},
  ISSN = {0883-2927},
  year = {2016},
  DOI = {10.1016/j.apgeochem.2015.10.007},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066004},
}