Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil.
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/1073 |
Resumo: | Spongillite from João Pinheiro, Minas Gerais, Brazil is mainly known for its use in brick production and in the refractory industry. Very few studies have focused on its geological context. Spongillite-rich deposits occur in shallow ponds on a karstic planation surface developed on rocks of the Neoproterozoic São Francisco Supergroup. Cenozoic siliciclastic sediments are related to this surface. A field study of these deposits and analysis of multispectral images showed a SE–NW preferential drainage system at SE, suggesting that Mesozoic Areado Group sandstones were the source area of the spongillite-hosting sediments. Mineralogical and textural characterization by optical microscopic analysis, X-ray diffraction (XRD), differential and gravimetric thermal analysis (DTA-GTA), infrared spectroscopy (IR) and scanning electron microscopy (SEM) of seven open-pit spongillite-rich deposits (Avião, Carvoeiro, Vânio, Preguiça, Divisa, Severino, Feijão) showed a sedimentological similarity between the deposits. They are lens-shaped and are characterized at the bottom by sand facies, in the middle by spicules-rich muddy-sand facies and at the top by organic matter-rich muddy-sand facies. Petrographically, the spongillite-hosting sediments and the siliclastic sediments of the Areado Group show detrital phases with similar mineralogical and textural features, such as the presence of well-sorted quartz grains and surface features of abrasion typical of aeolian reworking that occurred in the depositional environment in which the sandstones of the Areado Group were formed. Detrital heavy minerals, such as staurolite, zircon, tourmaline, and clay minerals, such as kaolinite, low amounts of illite, scarce chlorite and mixed-layer chlorite/smectite and illite/smectite occur in the spongillite-hosting sediments and in sandstones from the Areado Group. In both formations, staurolite has similar chemical composition. These mineralogical and textural features show that the sediments of the Areado Group constitute the main source of the pond sediments that host spongillite. |
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Almeida, Ariana Cristina SantosGomes, Newton SouzaVarajão, Angélica Fortes Drummond ChicarinoVarajão, César Augusto ChicarinoRibeiro, Cecília Volkmer2012-07-11T14:50:06Z2012-07-11T14:50:06Z2010ALMEIDA, A. C. S. et al. Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. Journal of South American Earth Sciences, v. 29, n. 2, p. 439-453, mar. 2010. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0895981109001485>. Acesso em: 11 jul. 2012.08959811http://www.repositorio.ufop.br/handle/123456789/1073Spongillite from João Pinheiro, Minas Gerais, Brazil is mainly known for its use in brick production and in the refractory industry. Very few studies have focused on its geological context. Spongillite-rich deposits occur in shallow ponds on a karstic planation surface developed on rocks of the Neoproterozoic São Francisco Supergroup. Cenozoic siliciclastic sediments are related to this surface. A field study of these deposits and analysis of multispectral images showed a SE–NW preferential drainage system at SE, suggesting that Mesozoic Areado Group sandstones were the source area of the spongillite-hosting sediments. Mineralogical and textural characterization by optical microscopic analysis, X-ray diffraction (XRD), differential and gravimetric thermal analysis (DTA-GTA), infrared spectroscopy (IR) and scanning electron microscopy (SEM) of seven open-pit spongillite-rich deposits (Avião, Carvoeiro, Vânio, Preguiça, Divisa, Severino, Feijão) showed a sedimentological similarity between the deposits. They are lens-shaped and are characterized at the bottom by sand facies, in the middle by spicules-rich muddy-sand facies and at the top by organic matter-rich muddy-sand facies. Petrographically, the spongillite-hosting sediments and the siliclastic sediments of the Areado Group show detrital phases with similar mineralogical and textural features, such as the presence of well-sorted quartz grains and surface features of abrasion typical of aeolian reworking that occurred in the depositional environment in which the sandstones of the Areado Group were formed. Detrital heavy minerals, such as staurolite, zircon, tourmaline, and clay minerals, such as kaolinite, low amounts of illite, scarce chlorite and mixed-layer chlorite/smectite and illite/smectite occur in the spongillite-hosting sediments and in sandstones from the Areado Group. In both formations, staurolite has similar chemical composition. These mineralogical and textural features show that the sediments of the Areado Group constitute the main source of the pond sediments that host spongillite.Areado GroupSão Francisco SupergroupSpongilliteAeolian quartzHeavy mineralsCharacterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleO periódico Journal of South American Earth Sciences concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3333730715857.info:eu-repo/semantics/openAccessengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPORIGINALARTIGO_CharacterizationOriginSpongillite.pdfARTIGO_CharacterizationOriginSpongillite.pdfapplication/pdf4792056http://www.repositorio.ufop.br/bitstream/123456789/1073/1/ARTIGO_CharacterizationOriginSpongillite.pdff7240b485398469f2faae78e901b55bdMD51123456789/10732019-02-26 10:37:29.689oai:localhost:123456789/1073Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-02-26T15:37:29Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. |
title |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. |
spellingShingle |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. Almeida, Ariana Cristina Santos Areado Group São Francisco Supergroup Spongillite Aeolian quartz Heavy minerals |
title_short |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. |
title_full |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. |
title_fullStr |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. |
title_full_unstemmed |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. |
title_sort |
Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. |
author |
Almeida, Ariana Cristina Santos |
author_facet |
Almeida, Ariana Cristina Santos Gomes, Newton Souza Varajão, Angélica Fortes Drummond Chicarino Varajão, César Augusto Chicarino Ribeiro, Cecília Volkmer |
author_role |
author |
author2 |
Gomes, Newton Souza Varajão, Angélica Fortes Drummond Chicarino Varajão, César Augusto Chicarino Ribeiro, Cecília Volkmer |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Almeida, Ariana Cristina Santos Gomes, Newton Souza Varajão, Angélica Fortes Drummond Chicarino Varajão, César Augusto Chicarino Ribeiro, Cecília Volkmer |
dc.subject.por.fl_str_mv |
Areado Group São Francisco Supergroup Spongillite Aeolian quartz Heavy minerals |
topic |
Areado Group São Francisco Supergroup Spongillite Aeolian quartz Heavy minerals |
description |
Spongillite from João Pinheiro, Minas Gerais, Brazil is mainly known for its use in brick production and in the refractory industry. Very few studies have focused on its geological context. Spongillite-rich deposits occur in shallow ponds on a karstic planation surface developed on rocks of the Neoproterozoic São Francisco Supergroup. Cenozoic siliciclastic sediments are related to this surface. A field study of these deposits and analysis of multispectral images showed a SE–NW preferential drainage system at SE, suggesting that Mesozoic Areado Group sandstones were the source area of the spongillite-hosting sediments. Mineralogical and textural characterization by optical microscopic analysis, X-ray diffraction (XRD), differential and gravimetric thermal analysis (DTA-GTA), infrared spectroscopy (IR) and scanning electron microscopy (SEM) of seven open-pit spongillite-rich deposits (Avião, Carvoeiro, Vânio, Preguiça, Divisa, Severino, Feijão) showed a sedimentological similarity between the deposits. They are lens-shaped and are characterized at the bottom by sand facies, in the middle by spicules-rich muddy-sand facies and at the top by organic matter-rich muddy-sand facies. Petrographically, the spongillite-hosting sediments and the siliclastic sediments of the Areado Group show detrital phases with similar mineralogical and textural features, such as the presence of well-sorted quartz grains and surface features of abrasion typical of aeolian reworking that occurred in the depositional environment in which the sandstones of the Areado Group were formed. Detrital heavy minerals, such as staurolite, zircon, tourmaline, and clay minerals, such as kaolinite, low amounts of illite, scarce chlorite and mixed-layer chlorite/smectite and illite/smectite occur in the spongillite-hosting sediments and in sandstones from the Areado Group. In both formations, staurolite has similar chemical composition. These mineralogical and textural features show that the sediments of the Areado Group constitute the main source of the pond sediments that host spongillite. |
publishDate |
2010 |
dc.date.issued.fl_str_mv |
2010 |
dc.date.accessioned.fl_str_mv |
2012-07-11T14:50:06Z |
dc.date.available.fl_str_mv |
2012-07-11T14:50:06Z |
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 |
ALMEIDA, A. C. S. et al. Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. Journal of South American Earth Sciences, v. 29, n. 2, p. 439-453, mar. 2010. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0895981109001485>. Acesso em: 11 jul. 2012. |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufop.br/handle/123456789/1073 |
dc.identifier.issn.none.fl_str_mv |
08959811 |
identifier_str_mv |
ALMEIDA, A. C. S. et al. Characterization and origin of spongillite-hosting sediment from João Pinheiro, Minas Gerais, Brazil. Journal of South American Earth Sciences, v. 29, n. 2, p. 439-453, mar. 2010. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0895981109001485>. Acesso em: 11 jul. 2012. 08959811 |
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http://www.repositorio.ufop.br/handle/123456789/1073 |
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