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

Detalhes bibliográficos
Autor(a) principal: Oliveira, Fábio Soares de
Data de Publicação: 2013
Outros Autores: Varajão, Angélica Fortes Drummond Chicarino, Varajão, César Augusto Chicarino, Boulangé, Bruno, Soares, Caroline Cibele Vieira
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
dARK ID: ark:/61566/0013000008v3x
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/4078
https://doi.org/10.1016/j.catena.2013.01.004
Resumo: The 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.
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spelling Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.BauxiteMineralogyGeochemistryMicromorphologyAlteration faciesThe 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.2014-12-01T16:14:29Z2014-12-01T16:14:29Z2013info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfOLIVEIRA, 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. 2014.0341-8162http://www.repositorio.ufop.br/handle/123456789/4078https://doi.org/10.1016/j.catena.2013.01.004ark:/61566/0013000008v3xO periódico CATENA concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3474901048182.info:eu-repo/semantics/openAccessOliveira, Fábio Soares deVarajão, Angélica Fortes Drummond ChicarinoVarajão, César Augusto ChicarinoBoulangé, BrunoSoares, Caroline Cibele Vieiraengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2024-11-10T20:16:33Zoai:repositorio.ufop.br:123456789/4078Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332024-11-10T20:16:33Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
title Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
spellingShingle Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
Oliveira, Fábio Soares de
Bauxite
Mineralogy
Geochemistry
Micromorphology
Alteration facies
title_short Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
title_full Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
title_fullStr Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
title_full_unstemmed Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
title_sort Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
author Oliveira, Fábio Soares de
author_facet Oliveira, Fábio Soares de
Varajão, Angélica Fortes Drummond Chicarino
Varajão, César Augusto Chicarino
Boulangé, Bruno
Soares, Caroline Cibele Vieira
author_role author
author2 Varajão, Angélica Fortes Drummond Chicarino
Varajão, César Augusto Chicarino
Boulangé, Bruno
Soares, Caroline Cibele Vieira
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Oliveira, Fábio Soares de
Varajão, Angélica Fortes Drummond Chicarino
Varajão, César Augusto Chicarino
Boulangé, Bruno
Soares, Caroline Cibele Vieira
dc.subject.por.fl_str_mv Bauxite
Mineralogy
Geochemistry
Micromorphology
Alteration facies
topic Bauxite
Mineralogy
Geochemistry
Micromorphology
Alteration facies
description The 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.
publishDate 2013
dc.date.none.fl_str_mv 2013
2014-12-01T16:14:29Z
2014-12-01T16:14:29Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv OLIVEIRA, 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.
0341-8162
http://www.repositorio.ufop.br/handle/123456789/4078
https://doi.org/10.1016/j.catena.2013.01.004
dc.identifier.dark.fl_str_mv ark:/61566/0013000008v3x
identifier_str_mv OLIVEIRA, 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.
0341-8162
ark:/61566/0013000008v3x
url http://www.repositorio.ufop.br/handle/123456789/4078
https://doi.org/10.1016/j.catena.2013.01.004
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFOP
instname:Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
instname_str Universidade Federal de Ouro Preto (UFOP)
instacron_str UFOP
institution UFOP
reponame_str Repositório Institucional da UFOP
collection Repositório Institucional da UFOP
repository.name.fl_str_mv Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)
repository.mail.fl_str_mv repositorio@ufop.edu.br
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