Mineralogical, micromorphological and geochemical evolution of the facies from the bauxite deposit of Barro Alto, Central Brazil.
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , |
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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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 |
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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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1817705777693982720 |