Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.

dc.contributor.authorOliveira, Fábio Soares de
dc.contributor.authorVarajão, Angélica Fortes Drummond Chicarino
dc.contributor.authorVarajão, César Augusto Chicarino
dc.contributor.authorBoulangé, Bruno
dc.contributor.authorSoares, Caroline Cibele Vieira
dc.date.accessioned2014-12-01T16:14:29Z
dc.date.available2014-12-01T16:14:29Z
dc.date.issued2013
dc.description.abstractThe hydrolytic alteration of anorthosite fromthe Barro Alto StratiformMafic–Ultramafic Complex (Central Brazil) caused the formation of an isalteritic bauxite. Petrological studies using X-ray diffraction (XRD),X-ray fluorescence (XRF), mass balance calculation and micromorphological description via optical microscopy were undertaken to understand the evolution of the bauxitic massif. The results suggest the transformation of the isalteritic bauxite (F1) into varied alteration facies and their filiations as follows: the formation of semi-compact massive bauxite (F2) and compact massive bauxite (F3) by the recrystallisation of gibbsite filing voids, resulting in enriched absolute aluminium (9 and 25%, respectively); the formation of laminar bauxite (F4) and fragmentary bauxite (F5), which is associated with different types of fragmented massive duricrust, such as those formed by mechanical (root activity, tectonics, etc.) and geochemical (dissolution of gibbsite, kaolinite neoformation, etc.) processes; the formation of palaeopediment bauxite (F6); the formation of degraded clay with gibbsitic nodules (F7), which is associated with the resilicification process by the oscillation of the water table caused by changes in the shapes of slopes and the cycling of silica by vegetation. Isalteritic clay (F8) facies directly derived fromthe anorthosite are also found. The relationship between the facies reflects the polygenetic evolution of the bauxitic massif.pt_BR
dc.identifier.citationOLIVEIRA, F. S. de et al. Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil. Catena, Cremlingen, v. 105, p. 29-39, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0341816213000167>. Acesso em: 18 set. 2014.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.catena.2013.01.004
dc.identifier.issn0341-8162
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/4078
dc.language.isoen_USpt_BR
dc.rights.licenseO periódico CATENA concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3474901048182.pt_BR
dc.subjectBauxitept_BR
dc.subjectMineralogypt_BR
dc.subjectGeochemistrypt_BR
dc.subjectMicromorphologypt_BR
dc.subjectAlteration faciespt_BR
dc.titleMineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.pt_BR
dc.typeArtigo publicado em periodicopt_BR

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