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- W2019927283 abstract "The mineralogy of the Latosols of the Brazilian Central Plateau remains under discussion in the absence of a clear relationship with their age according to their geomorphic location. The aim of this study was thus to clarify the origin of the kaolinite and gibbsite content variation by studying a regional toposequence and using data from the literature. Chemical composition and soil color were used to discuss mineralogy. The mineralogy of the clay fraction was also investigated using X-ray diagrams. Our results showed that the large variation of kaolinite and gibbsite content can be explained by taking into account both their local and regional location, the variation of the hematite and goethite content remaining limited. The model that is proposed to explain such variation combines a regional component, which is mainly associated to the age of the geomorphic surface and a local component which is mainly associated to the hydraulic conditions along the toposequence. La minéralogie des latosols du Plateau Central brésilien est discutée en l’absence de relation clairement établie avec leur âge qui est en fonction de leur position géomorphologique. L’objectif de cette étude est par conséquent de clarifier l’origine de la variation de teneur en kaolinite et gibbsite en étudiant une toposéquence régionale et les données de la littérature. La minéralogie a été discutée à partir de la composition chimique et de la couleur du sol. Elle a aussi été discutée à l’aide des données de la diffraction des rayons X. Les résultats montrent que la variation élevée de la proportion de kaolinite et de gibbsite des latosols peut être expliquée en prenant en compte à la fois leur localisation régionale et locale. Le modèle proposé combine en effet une composante régionale qui est principalement liée à l’âge de la surface géomorphologique et une composante locale qui est principalement liée aux conditions hydriques le long de la toposéquence." @default.
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- W2019927283 date "2008-11-01" @default.
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- W2019927283 title "Variation of the kaolinite and gibbsite content at regional and local scale in Latosols of the Brazilian Central Plateau" @default.
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- W2019927283 doi "https://doi.org/10.1016/j.crte.2008.07.006" @default.
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