@article{fdi:010053766,
  title = {{C}hemical weathering and atmospheric/soil {CO}2 uptake in the {A}ndean and foreland {A}mazon basins},
  author = {{M}oquet, {J}. {S}. and {C}rave, {A}. and {V}iers, {J}. and {S}eyler, {P}atrick and {A}rmijos, {E}. and {B}ourrel, {L}uc and {C}havarri, {E}. and {L}agane, {C}hristelle and {L}araque, {A}lain and {C}asimiro, {W}. {S}. {L}. and {P}ombosa, {R}. and {N}oriega, {L}. and {V}era, {A}. and {G}uyot, {J}ean-{L}oup},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study is a geochemical investigation of the {A}ndean and {F}oreland basins of the {A}mazon {R}iver at high spatial and time resolution, carried out within the framework of the {HYBAM} research program ({H}ydro-geodynamics of the {A}mazon {B}asin). {M}onthly sampling was carried out at 27 gauging stations located in the upper tributaries of the {A}mazon {B}asin (from north to south: the {N}apo, {M}aranon, {U}cayali, {M}adre de {D}ios-{B}eni and {M}amore {R}ivers). {T}he aim of this paper is to estimate the present-day chemical weathering rate ({CWR}), as well as the flux of {CO}2 consumption from total and silicate weathering in the {A}ndes and {F}oreland {A}mazon basins, and to discuss their distribution as a function of geomorphic and structural parameters. {B}ased on the forward method, the {N}apo and other {E}cuadorian basins present high silicate weathering rates in comparison with the other basins. {W}e confirm that the {M}aranon and {U}cayali {R}ivers control the {A}mazon hydrochemistry due to the presence of salt rocks and carbonates in these basins. {T}he {M}adre de {D}ios, {B}eni and {M}amore basins do not contribute much to the {A}mazon dissolved load. {T}his north to south {CWR} gradient can be explained by the combination of decreasing weatherable lithology surface and decreasing runoff rates from the north to the south. {T}he foreland part of the basins (or {M}ountain-{L}owland transition) accounts for nearly the same proportion of the {A}mazon silicate chemical weathering and carbonate chemical weathering fluxes as the {A}ndean part. {T}his result demonstrates the importance of the sediment accumulation areas in the {A}mazon {B}asin weathering budget and can be explained by the occurrence of a higher temperature, the deposition of fresh sediments from {A}ndean erosion and a higher sediment residence time than in the upper part of the basin. {W}ith a total {CO}2 consumption rate of 744.10(3) moles km(-2)year(-1) and a silicate {CO}2 consumption rate of 300.10(3) moles km(-2)year(-1), the {U}pper {A}mazon {R}iver ({A}ndes + {F}oreland part) is the most intense part of the {A}mazon {B}asin in terms of atmospheric {CO}2 consumption by weathering processes. {I}t is an important {CO}2 sink by weathering processes but accounts for only somewhat more than half of the {CO}2 consumption by silicate weathering of the {A}mazon {B}asin. {T}his result points out the importance of the {L}owland part of the basin in the inorganic {C} silicate budget. {T}he {U}pper {A}mazon accounts for 2-4% of the world's silicate {CO}2 consumption, which is the same proportion as for the southern and southern-east {H}imalaya and {T}ibetan plateau.},
  keywords = {{A}ndes ; {F}oreland ; {A}mazon {B}asin ; {H}ydrochemistry ; {C}hemical weathering ; {CO}2 consumption},
  booktitle = {},
  journal = {{C}hemical {G}eology},
  volume = {287},
  numero = {1-2},
  pages = {1--26},
  ISSN = {0009-2541},
  year = {2011},
  DOI = {10.1016/j.chemgeo.2011.01.005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053766},
}