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• W2044479101 abstract "Formation and transformation processes of iron duricrust developed under tropical humid conditions in the southeastern part of the Central African Republic have been investigated in terms of geomorphological, petrological and geochemical pathways. The study of five typical weathering profiles of the most extensive iron duricrust system now known in the world indicates that saprolitization and ferruginization are sequentially involved in such processes, as reflected by kaolinite-gibbsite and hematite-goethite replacements. Alkali earths, rare earths, metals and elements belonging to chemically inert minerals segregate during saprolite and iron duricrust formation and degradation. Mass-balance calculations performed on a typical weathering system enable us to quantify net mass element transfers deriving from lateritic weathering processes. Volumetric change, collapse or dilation, as well as Al and Ti clearly discriminate between the saprolitization and ferruginization processes. Saprolite development preserves the geochemical inheritance of parent rocks, whereas ferruginization depletes it and mostly reflects, through mineralogical pathways, pedoclimatic conditions and global climatic changes. The global iron duricrust system of the southern part of Central Africa derived from previous hematite-rich crust, and not from ancient bauxites as it is generally believed for iron crusts, formed on West African shields." @default.
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• W2044479101 date "1993-05-01" @default.
• W2044479101 modified "2023-10-13" @default.
• W2044479101 title "Formation and transformation processes of iron duricrust systems in tropical humid environment" @default.
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• W2044479101 doi "https://doi.org/10.1016/0009-2541(93)90167-h" @default.
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