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Genesis of a mottled horizon by Fe-depletion within a laterite cover in the Amazon Basin.

Abstract : A mottled horizon in a laterite cover (without any duricrust) was studied by microscopy and quantitative chemical microanalysis. Apart from the voids, light red spots consisting of Fe-rich particles (≈2 μm) are set in clayey plasma. Dark red spots consisted of concentrations of Fe-rich particles. These patterns are inherited. On the border of structural or biological voids, where Fe-depletion features are systematic, gray or yellow spots result from dissolution of the Fe-rich particles and impregnation of the plasma by iron, respectively. The present Fe-depletion is the dominant process that explains the mottled differentiation and the absence of lateritic duricrust.
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Vania Rosolen, Mathieu Lamotte, René Boulet, Jean Trichet, Olivier Rouer, et al.. Genesis of a mottled horizon by Fe-depletion within a laterite cover in the Amazon Basin.. Comptes Rendus Géoscience, Elsevier Masson, 2002, 334, pp.187-195. ⟨10.1016/S1631-0713(02)01721-2⟩. ⟨hal-00077598⟩

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