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Genesis of a mottled horizon by Fe-depletion within a laterite cover in the Amazon Basin
- Source :
- Comptes Rendus Géoscience, Comptes Rendus Géoscience, 2002, 334, pp.187-195. ⟨10.1016/S1631-0713(02)01721-2⟩, Comptes Rendus Géoscience, Elsevier, 2002, 334, pp.187-195. ⟨10.1016/S1631-0713(02)01721-2⟩
- Publication Year :
- 2002
- Publisher :
- HAL CCSD, 2002.
-
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. To cite this article: V. Rosolen et al., C. R. Geoscience 334 (2002) 187–195.
- Subjects :
- [SDE.MCG]Environmental Sciences/Global Changes
Mineralogy
engineering.material
010502 geochemistry & geophysics
01 natural sciences
Microanalysis
iron
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Laterite
quantitative chemical microprobe
Dissolution
Duricrust
0105 earth and related environmental sciences
Global and Planetary Change
Cambisol
plinthic Cambisol
Horizon (archaeology)
04 agricultural and veterinary sciences
040103 agronomy & agriculture
engineering
microscopy
0401 agriculture, forestry, and fisheries
General Earth and Planetary Sciences
Soil horizon
Sedimentary rock
Geology
scanning electron microscopy
Brazil
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Comptes Rendus Géoscience, Comptes Rendus Géoscience, 2002, 334, pp.187-195. ⟨10.1016/S1631-0713(02)01721-2⟩, Comptes Rendus Géoscience, Elsevier, 2002, 334, pp.187-195. ⟨10.1016/S1631-0713(02)01721-2⟩
- Accession number :
- edsair.doi.dedup.....bfc06325d08901e8bce986a97feaae41