The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorOliveira, Fábio Soares de-
Autor(es): dc.creatorVarajão, Angélica Fortes Drummond Chicarino-
Autor(es): dc.creatorVarajão, César Augusto Chicarino-
Autor(es): dc.creatorSchaefer, Carlos Ernesto Gonçalves Reynaud-
Autor(es): dc.creatorBoulangé, Bruno-
Data de aceite: dc.date.accessioned2019-11-06T13:30:46Z-
Data de disponibilização: dc.date.available2019-11-06T13:30:46Z-
Data de envio: dc.date.issued2015-01-28-
Data de envio: dc.date.issued2015-01-28-
Data de envio: dc.date.issued2014-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/4421-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/556906-
Descrição: dc.descriptionPetrological studies using X-ray diffraction (XRD) and micromorphological analyses (Optical Microscopy and SEM), were done to understand the role of biological activity in the evolution of Barro Alto bauxite. The results indicated that this influence came through structural (or microstructural) and mineralogical transformations, namely: I — the bioturbation caused by termites and II — themechanical degradation and geochemical transformation promoted by roots. In the bioturbation caused by termiteswere formed: I — a intergrainmicro-aggregate structure, characterised by gibbsite crystals from isalteritic bauxite fragmentation on the bottom of the profile and II — a granular structure characterised by a termitic microaggregates with fragments of gibbsite immersed in a kaolinite–gibbsite–goethite–boehmite micromass, formed by bioturbation of the degradation clay with nodules of gibbsite,whose origin is the geochemistry degradation of isalteritic bauxite. The processes associatedwith geochemical andmechanical degradation caused by roots were responsible for the genesis of: I—a porphyric texture with bauxite fragments surrounded by nonaggregate material and II — fine monic structure where the gibbsite neoformation has the mould cavities left by old roots, generating riziform features.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Geoderma concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3474901110818.-
Palavras-chave: dc.subjectBauxite-
Palavras-chave: dc.subjectBiological activity-
Palavras-chave: dc.subjectMicrostructural transformations-
Palavras-chave: dc.subjectMineralogical transformations-
Palavras-chave: dc.subjectBarro Alto-
Título: dc.titleThe role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil.-
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