A comparison of properties of clay minerals in isalteritic and in degraded facies.

dc.contributor.authorOliveira, Fábio Soares de
dc.contributor.authorVarajão, Angélica Fortes Drummond Chicarino
dc.contributor.authorVarajão, César Augusto Chicarino
dc.contributor.authorBoulangé, Bruno
dc.date.accessioned2017-07-31T14:58:06Z
dc.date.available2017-07-31T14:58:06Z
dc.date.issued2013
dc.description.abstractThe mineralogical, geochemical and micromorphological features of an isalteritic clay facies, which originated from weathering of an anorthosite, were compared to those of clay facies derived from the degradation of a bauxite developed from the same rock. The isalteritic clay was formed by the hydrolytic alteration of plagioclase, whereas the degraded clays were formed by decomposition of gibbsite and neoformation of kaolinite. This resilification process resulted from the reintroduction of silica via the oscillation of the phreatic level and/or the decomposition of organic matter on the surface. The degradation process was gradual and yielded two different facies: (a) degraded clays with almost total decomposition of gibbsite, and (b) degraded clays with gibbsite nodules. Morphologically, the isalteritic clays differ from the degraded clays because they contain larger hexagonal and pseudo-hexagonal crystals. The degraded clays have more irregular crystal shapes, ranging from laths to anhedral shapes.pt_BR
dc.identifier.citationOLIVEIRA, F. S. de et al. A comparison of properties of clay minerals in isalteritic and in degraded facies. Clay Minerals, v. 48, p. 697-711, 2013. Disponível em: <https://www.cambridge.org/core/journals/clay-minerals/article/comparison-of-properties-of-clay-minerals-in-isalteritic-and-in-degraded-facies/31FF5043B56CC834E4983BD1CA462977#>. Acesso em: 20 de jun. 2017.pt_BR
dc.identifier.doihttps://doi.org/10.1180/claymin.2013.048.5.03
dc.identifier.issn 1471-8030
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/8375
dc.identifier.uri2https://www.cambridge.org/core/journals/clay-minerals/article/comparison-of-properties-of-clay-minerals-in-isalteritic-and-in-degraded-facies/31FF5043B56CC834E4983BD1CA462977#pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectIsalteritic clay faciespt_BR
dc.subjectDegraded faciespt_BR
dc.subjectAnorthositept_BR
dc.subjectBauxite degpt_BR
dc.titleA comparison of properties of clay minerals in isalteritic and in degraded facies.pt_BR
dc.typeArtigo publicado em periodicopt_BR

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