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• W862769994 abstract "In this classifiation of lateritic coversfour major types are distinguished. ferricretes, latosols, conakrytes and bamites. In ferricretes, hematite is associated with kaolinite,$ming mottles, nodules and metanoduks. When, at the top ofprojks, goethite and sometimes gibbsite develop at the expense of hematite and kaolinite, protopisolitic andpisolitic dismantlingfacies are f inned FerriCretes, in which hematite and kaolinite firm concretions, are widespread and are the most common iron accumulations. Latosols are so) lateritic covers with a microglaebular structure. Red latosols, like ferricretes, are essentially formed by an assoriation of hematite and kaolinite, but with largerproportions ofgoethite and with the presence ofgibbsite. Lateritic bauxites are concentrations of aluminium with which iron is very ofen associated Four major types of lateritic bauxites: protobauxites, orthobamites, metabauxites and cryptobauxites are defined ar a finction of the nature of iron and aluminium minerals as well as their relative distributions in projks. Protobauxites are lateritic soils wheregibbsite andgoethite f i rm together under very humid climates. Orthobauxites are allites or arferrites, rich in gibbsite and red in colour, which do not exhibit a concretionary structure. Iron may be concentrated in bard caps calledconakrytes and located close to the top of the bauxiticprojks. Conakrytes are reticular and non nodularferriies orferrallites in which hematite andgoethite dominate and where gibbsite could be present in small proportions. The presence of kaolinite at the bottom o f the projks is not necessary. Metabamites are boehmitir and show a concretionary orpisolitic structure; iron is dissociatedfiom aluminium and is frequently concentraied as hematite in a kaolinitic ferricrete located at the bottom of the bauxiticprofile. Kaolinite always appears at the bottom of metabauxiteprojiles and lessjequently at the base oforthobawites. In qptobauxites, kaolinite is abunhnt at the top and at the bottom of the profles so that thegibbsitic layer is embedded between two kaolinitic horizons. This petrological andgeochemical class$cation of laterites is based on reactions of hydration-akhydration and ofsilication-desilication regulated by temperature, water activity and chemical composition of the parent material Lateritic bauxites, ferricretes and latosoh are witnesses of the succession ofpaleoclimates throughout the last 150 million yean, since the Atlantic opening. KTworh: laterites, ferricretes, latosols, c o n a b e s , bauxites, hematite, goethite, kaolinite, gibbsite, boehmite c ar .G S L microglaebular) and ferricretes (nodular and always indurated) are lateritic covers, widely distributed in North and South America, in West, Central and Easc Africa, as well as in Australia, 3 o Q" @default.
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• W862769994 date "1995-01-01" @default.
• W862769994 modified "2023-09-27" @default.
• W862769994 title "Petrological and geochemical classification of laterites" @default.
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