The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil.
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/4421 https://doi.org/10.1016/j.geoderma.2014.02.012 |
Resumo: | Petrological 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. |
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Oliveira, Fábio Soares deVarajão, Angélica Fortes Drummond ChicarinoVarajão, César Augusto ChicarinoSchaefer, Carlos Ernesto Gonçalves ReynaudBoulangé, Bruno2015-01-28T20:01:03Z2015-01-28T20:01:03Z2014OLIVEIRA, F. S. de et al. The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. Geoderma, Amsterdam, v. 227, p. 250-259, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0016706114000809>. Acesso em: 18 set. 2014.0016-7061http://www.repositorio.ufop.br/handle/123456789/4421https://doi.org/10.1016/j.geoderma.2014.02.012Petrological 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.BauxiteBiological activityMicrostructural transformationsMineralogical transformationsBarro AltoThe role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleO periódico Geoderma concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3474901110818.info:eu-repo/semantics/openAccessengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://www.repositorio.ufop.br/bitstream/123456789/4421/2/license.txt8a4605be74aa9ea9d79846c1fba20a33MD52ORIGINALARTIGO_RoleBiologicalAgents.pdfARTIGO_RoleBiologicalAgents.pdfapplication/pdf4927949http://www.repositorio.ufop.br/bitstream/123456789/4421/1/ARTIGO_RoleBiologicalAgents.pdfa319de30b02c465e06b599a548e4f01dMD51123456789/44212019-06-18 10:49:39.118oai:localhost:123456789/4421Tk9URTogUExBQ0UgWU9VUiBPV04gTElDRU5TRSBIRVJFClRoaXMgc2FtcGxlIGxpY2Vuc2UgaXMgcHJvdmlkZWQgZm9yIGluZm9ybWF0aW9uYWwgcHVycG9zZXMgb25seS4KCk5PTi1FWENMVVNJVkUgRElTVFJJQlVUSU9OIExJQ0VOU0UKCkJ5IHNpZ25pbmcgYW5kIHN1Ym1pdHRpbmcgdGhpcyBsaWNlbnNlLCB5b3UgKHRoZSBhdXRob3Iocykgb3IgY29weXJpZ2h0Cm93bmVyKSBncmFudHMgdG8gRFNwYWNlIFVuaXZlcnNpdHkgKERTVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24gKGluY2x1ZGluZwp0aGUgYWJzdHJhY3QpIHdvcmxkd2lkZSBpbiBwcmludCBhbmQgZWxlY3Ryb25pYyBmb3JtYXQgYW5kIGluIGFueSBtZWRpdW0sCmluY2x1ZGluZyBidXQgbm90IGxpbWl0ZWQgdG8gYXVkaW8gb3IgdmlkZW8uCgpZb3UgYWdyZWUgdGhhdCBEU1UgbWF5LCB3aXRob3V0IGNoYW5naW5nIHRoZSBjb250ZW50LCB0cmFuc2xhdGUgdGhlCnN1Ym1pc3Npb24gdG8gYW55IG1lZGl1bSBvciBmb3JtYXQgZm9yIHRoZSBwdXJwb3NlIG9mIHByZXNlcnZhdGlvbi4KCllvdSBhbHNvIGFncmVlIHRoYXQgRFNVIG1heSBrZWVwIG1vcmUgdGhhbiBvbmUgY29weSBvZiB0aGlzIHN1Ym1pc3Npb24gZm9yCnB1cnBvc2VzIG9mIHNlY3VyaXR5LCBiYWNrLXVwIGFuZCBwcmVzZXJ2YXRpb24uCgpZb3UgcmVwcmVzZW50IHRoYXQgdGhlIHN1Ym1pc3Npb24gaXMgeW91ciBvcmlnaW5hbCB3b3JrLCBhbmQgdGhhdCB5b3UgaGF2ZQp0aGUgcmlnaHQgdG8gZ3JhbnQgdGhlIHJpZ2h0cyBjb250YWluZWQgaW4gdGhpcyBsaWNlbnNlLiBZb3UgYWxzbyByZXByZXNlbnQKdGhhdCB5b3VyIHN1Ym1pc3Npb24gZG9lcyBub3QsIHRvIHRoZSBiZXN0IG9mIHlvdXIga25vd2xlZGdlLCBpbmZyaW5nZSB1cG9uCmFueW9uZSdzIGNvcHlyaWdodC4KCklmIHRoZSBzdWJtaXNzaW9uIGNvbnRhaW5zIG1hdGVyaWFsIGZvciB3aGljaCB5b3UgZG8gbm90IGhvbGQgY29weXJpZ2h0LAp5b3UgcmVwcmVzZW50IHRoYXQgeW91IGhhdmUgb2J0YWluZWQgdGhlIHVucmVzdHJpY3RlZCBwZXJtaXNzaW9uIG9mIHRoZQpjb3B5cmlnaHQgb3duZXIgdG8gZ3JhbnQgRFNVIHRoZSByaWdodHMgcmVxdWlyZWQgYnkgdGhpcyBsaWNlbnNlLCBhbmQgdGhhdApzdWNoIHRoaXJkLXBhcnR5IG93bmVkIG1hdGVyaWFsIGlzIGNsZWFybHkgaWRlbnRpZmllZCBhbmQgYWNrbm93bGVkZ2VkCndpdGhpbiB0aGUgdGV4dCBvciBjb250ZW50IG9mIHRoZSBzdWJtaXNzaW9uLgoKSUYgVEhFIFNVQk1JU1NJT04gSVMgQkFTRUQgVVBPTiBXT1JLIFRIQVQgSEFTIEJFRU4gU1BPTlNPUkVEIE9SIFNVUFBPUlRFRApCWSBBTiBBR0VOQ1kgT1IgT1JHQU5JWkFUSU9OIE9USEVSIFRIQU4gRFNVLCBZT1UgUkVQUkVTRU5UIFRIQVQgWU9VIEhBVkUKRlVMRklMTEVEIEFOWSBSSUdIVCBPRiBSRVZJRVcgT1IgT1RIRVIgT0JMSUdBVElPTlMgUkVRVUlSRUQgQlkgU1VDSApDT05UUkFDVCBPUiBBR1JFRU1FTlQuCgpEU1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZQpzdWJtaXNzaW9uLCBhbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMKbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo=Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-06-18T14:49:39Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. |
title |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. |
spellingShingle |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. Oliveira, Fábio Soares de Bauxite Biological activity Microstructural transformations Mineralogical transformations Barro Alto |
title_short |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. |
title_full |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. |
title_fullStr |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. |
title_full_unstemmed |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. |
title_sort |
The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. |
author |
Oliveira, Fábio Soares de |
author_facet |
Oliveira, Fábio Soares de Varajão, Angélica Fortes Drummond Chicarino Varajão, César Augusto Chicarino Schaefer, Carlos Ernesto Gonçalves Reynaud Boulangé, Bruno |
author_role |
author |
author2 |
Varajão, Angélica Fortes Drummond Chicarino Varajão, César Augusto Chicarino Schaefer, Carlos Ernesto Gonçalves Reynaud Boulangé, Bruno |
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 Schaefer, Carlos Ernesto Gonçalves Reynaud Boulangé, Bruno |
dc.subject.por.fl_str_mv |
Bauxite Biological activity Microstructural transformations Mineralogical transformations Barro Alto |
topic |
Bauxite Biological activity Microstructural transformations Mineralogical transformations Barro Alto |
description |
Petrological 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. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014 |
dc.date.accessioned.fl_str_mv |
2015-01-28T20:01:03Z |
dc.date.available.fl_str_mv |
2015-01-28T20:01:03Z |
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.citation.fl_str_mv |
OLIVEIRA, F. S. de et al. The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. Geoderma, Amsterdam, v. 227, p. 250-259, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0016706114000809>. Acesso em: 18 set. 2014. |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufop.br/handle/123456789/4421 |
dc.identifier.issn.none.fl_str_mv |
0016-7061 |
dc.identifier.doi.none.fl_str_mv |
https://doi.org/10.1016/j.geoderma.2014.02.012 |
identifier_str_mv |
OLIVEIRA, F. S. de et al. The role of biological agents in the microstructural and mineralogical transformations in aluminium lateritic deposit in Central Brazil. Geoderma, Amsterdam, v. 227, p. 250-259, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0016706114000809>. Acesso em: 18 set. 2014. 0016-7061 |
url |
http://www.repositorio.ufop.br/handle/123456789/4421 https://doi.org/10.1016/j.geoderma.2014.02.012 |
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eng |
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