Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal

Detalhes bibliográficos
Autor(a) principal: Silva, Teresa
Data de Publicação: 2021
Outros Autores: Matos, João Xavier, De Oliveira, Daniel Pipa Soares, Morais, Igor, Gonçalves, Pedro, Albardeiro, Luís, Carvalho, Fernanda, Menda, Ugur Deneb, Veiga, JP
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.9/3703
Resumo: ABSTRACT: The sheltered environment of the Algares +30 level adit (underground mine gallery) contributes to the preservation of secondary water-soluble minerals formed on the tunnel walls. The massive sulphide and related stockwork zone are hosted by the Mine Tuff volcanic unit and are exposed in the walls of the gallery, showing intense oxidation and hydrothermal alteration. Minerals from the halotrichite group were identified on the efflorescent salts, typically white fine-acicular crystals but also on aggregates with dark orange/brownish colour. Mineral characterization was performed using several methods and analytical techniques (XRD, XRF-WDS, SEM-EDS, DTA-TG), and the chemical formulas were calculated maintaining the ratio A:B ≅ 1:2 in accordance with the general formula of the halotrichite group, AB2(SO4)4·22H2O. This methodology allowed the assignment of the orange colour to the presence of trivalent iron on iron-rich pickeringite in partial substitution of aluminium.
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spelling Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, PortugalOrange PickeringiteAlotrichiteEfflorescent mineralsUnderground miningAlgares mineIberian Pyrite Belt sulphide oresABSTRACT: The sheltered environment of the Algares +30 level adit (underground mine gallery) contributes to the preservation of secondary water-soluble minerals formed on the tunnel walls. The massive sulphide and related stockwork zone are hosted by the Mine Tuff volcanic unit and are exposed in the walls of the gallery, showing intense oxidation and hydrothermal alteration. Minerals from the halotrichite group were identified on the efflorescent salts, typically white fine-acicular crystals but also on aggregates with dark orange/brownish colour. Mineral characterization was performed using several methods and analytical techniques (XRD, XRF-WDS, SEM-EDS, DTA-TG), and the chemical formulas were calculated maintaining the ratio A:B ≅ 1:2 in accordance with the general formula of the halotrichite group, AB2(SO4)4·22H2O. This methodology allowed the assignment of the orange colour to the presence of trivalent iron on iron-rich pickeringite in partial substitution of aluminium.MDPIRepositório do LNEGSilva, TeresaMatos, João XavierDe Oliveira, Daniel Pipa SoaresMorais, IgorGonçalves, PedroAlbardeiro, LuísCarvalho, FernandaMenda, Ugur DenebVeiga, JP2022-01-18T12:30:53Z2021-10-01T00:00:00Z2021-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/3703engSilva et al. 2021, ‘Orange Pickeringite from the Algares 30-level adit, Aljustrel mine, Iberian Pyrite Belt, Portugal’. Minerals, vol. 11, n.º 10, 1115. doi:10.3390/min111011152075-163Xhttps://doi.org/10.3390/min111011152075-163Xinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-06T12:29:26Zoai:repositorio.lneg.pt:10400.9/3703Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:36:54.979471Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
title Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
spellingShingle Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
Silva, Teresa
Orange Pickeringite
Alotrichite
Efflorescent minerals
Underground mining
Algares mine
Iberian Pyrite Belt sulphide ores
title_short Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
title_full Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
title_fullStr Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
title_full_unstemmed Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
title_sort Orange Pickeringite from the Algares 30-Level Adit, Aljustrel Mine, Iberian Pyrite Belt, Portugal
author Silva, Teresa
author_facet Silva, Teresa
Matos, João Xavier
De Oliveira, Daniel Pipa Soares
Morais, Igor
Gonçalves, Pedro
Albardeiro, Luís
Carvalho, Fernanda
Menda, Ugur Deneb
Veiga, JP
author_role author
author2 Matos, João Xavier
De Oliveira, Daniel Pipa Soares
Morais, Igor
Gonçalves, Pedro
Albardeiro, Luís
Carvalho, Fernanda
Menda, Ugur Deneb
Veiga, JP
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório do LNEG
dc.contributor.author.fl_str_mv Silva, Teresa
Matos, João Xavier
De Oliveira, Daniel Pipa Soares
Morais, Igor
Gonçalves, Pedro
Albardeiro, Luís
Carvalho, Fernanda
Menda, Ugur Deneb
Veiga, JP
dc.subject.por.fl_str_mv Orange Pickeringite
Alotrichite
Efflorescent minerals
Underground mining
Algares mine
Iberian Pyrite Belt sulphide ores
topic Orange Pickeringite
Alotrichite
Efflorescent minerals
Underground mining
Algares mine
Iberian Pyrite Belt sulphide ores
description ABSTRACT: The sheltered environment of the Algares +30 level adit (underground mine gallery) contributes to the preservation of secondary water-soluble minerals formed on the tunnel walls. The massive sulphide and related stockwork zone are hosted by the Mine Tuff volcanic unit and are exposed in the walls of the gallery, showing intense oxidation and hydrothermal alteration. Minerals from the halotrichite group were identified on the efflorescent salts, typically white fine-acicular crystals but also on aggregates with dark orange/brownish colour. Mineral characterization was performed using several methods and analytical techniques (XRD, XRF-WDS, SEM-EDS, DTA-TG), and the chemical formulas were calculated maintaining the ratio A:B ≅ 1:2 in accordance with the general formula of the halotrichite group, AB2(SO4)4·22H2O. This methodology allowed the assignment of the orange colour to the presence of trivalent iron on iron-rich pickeringite in partial substitution of aluminium.
publishDate 2021
dc.date.none.fl_str_mv 2021-10-01T00:00:00Z
2021-10-01T00:00:00Z
2022-01-18T12:30:53Z
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 http://hdl.handle.net/10400.9/3703
url http://hdl.handle.net/10400.9/3703
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Silva et al. 2021, ‘Orange Pickeringite from the Algares 30-level adit, Aljustrel mine, Iberian Pyrite Belt, Portugal’. Minerals, vol. 11, n.º 10, 1115. doi:10.3390/min11101115
2075-163X
https://doi.org/10.3390/min11101115
2075-163X
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.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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