Fritsch Emmanuel auteur aut IRD Balan Etienne auteur aut IRD Do Nascimento N. R. auteur aut IRD Allard T. auteur aut IRD Bardy M. auteur aut IRD Bueno G. auteur aut IRD Derenne S. auteur aut IRD Melfi A. J. auteur aut IRD Calas G. auteur aut IRD text journalArticle eng text/pdf born digital access This article reports major results from collaborative research between France and Brazil on soil and water systems, carried out in the Upper Amazon Basin. It reveals the weathering processes acting in the partly inundated, low elevation plateaus of the Basin, mostly covered by evergreen forest. Our findings are based on geochemical data and mineral spectroscopy that probe the crystal chemistry of Fe and Al in mineral phases (mainly kaolinite, Al- and Fe-(hydr)oxides) of tropical soils (laterites). These techniques reveal crystal alterations in mineral populations of different ages and changes of metal speciation associated with mineral or organic phases. These results provide an integrated model of soil formation and changes (from laterites to podzols) in distinct hydrological compartments of the Amazon landscapes and under altered water regimes. specialized Crystal chemistry of Al and Fe Kaolinite Fe-oxides Organo-metallic complexes Laterites podzols Amazon Basin 064 068 343 2-3 188-198 2011 1631-0713 https://www.documentation.ird.fr/hor/fdi:010053510 10.1016/j.crte.2010.11.002 1631-0713 [F B010053510] https://www.documentation.ird.fr/hor/fdi:010053510 https://www.documentation.ird.fr/intranet/publi/2011/05/010053510.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-05-31 2017-08-23 fdi:010053510 fre