Alteration and alterability of the anorthosite from Angola

Detalhes bibliográficos
Autor(a) principal: Simão, J.
Data de Publicação: 2010
Outros Autores: Silva, Z. C. G.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/4671
Resumo: Siliceous rocks are widely used as dimension stone but the last decades have registered an increase rate of their alteration when exposed to polluted environments. Anorthosites were treated by acidified solutions of HCl, HN03 and H2S04 simulating acid rain and the response was recorded through different experiments such as on the surface of the polished rock and on the surface of uncovered thin sections. The main components, plagioclase and olivine, both responded in similar ways to each acid solution, although following different trends; while plagioclase develops a thin layer which acts as protection to the mineral, olivine at first undergoes alteration due to leaching of magnesium and iron and in a following stage, is mechanically removed from the rock. The action of warm water on the rock was tested through the use of the Soxhlet extractor which caused changes on the rock colour and leaching of several cations from its components.
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spelling Alteration and alterability of the anorthosite from AngolaAnorthositeDimension stoneAlterationPolluted environmentAcid rainSiliceous rocks are widely used as dimension stone but the last decades have registered an increase rate of their alteration when exposed to polluted environments. Anorthosites were treated by acidified solutions of HCl, HN03 and H2S04 simulating acid rain and the response was recorded through different experiments such as on the surface of the polished rock and on the surface of uncovered thin sections. The main components, plagioclase and olivine, both responded in similar ways to each acid solution, although following different trends; while plagioclase develops a thin layer which acts as protection to the mineral, olivine at first undergoes alteration due to leaching of magnesium and iron and in a following stage, is mechanically removed from the rock. The action of warm water on the rock was tested through the use of the Soxhlet extractor which caused changes on the rock colour and leaching of several cations from its components.RUNSimão, J.Silva, Z. C. G.2010-12-28T15:08:11Z2010-12-282010-12-28T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10362/4671enginfo: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:RCAAP2024-03-11T03:34:34Zoai:run.unl.pt:10362/4671Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:15:48.615933Repositório 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 Alteration and alterability of the anorthosite from Angola
title Alteration and alterability of the anorthosite from Angola
spellingShingle Alteration and alterability of the anorthosite from Angola
Simão, J.
Anorthosite
Dimension stone
Alteration
Polluted environment
Acid rain
title_short Alteration and alterability of the anorthosite from Angola
title_full Alteration and alterability of the anorthosite from Angola
title_fullStr Alteration and alterability of the anorthosite from Angola
title_full_unstemmed Alteration and alterability of the anorthosite from Angola
title_sort Alteration and alterability of the anorthosite from Angola
author Simão, J.
author_facet Simão, J.
Silva, Z. C. G.
author_role author
author2 Silva, Z. C. G.
author2_role author
dc.contributor.none.fl_str_mv RUN
dc.contributor.author.fl_str_mv Simão, J.
Silva, Z. C. G.
dc.subject.por.fl_str_mv Anorthosite
Dimension stone
Alteration
Polluted environment
Acid rain
topic Anorthosite
Dimension stone
Alteration
Polluted environment
Acid rain
description Siliceous rocks are widely used as dimension stone but the last decades have registered an increase rate of their alteration when exposed to polluted environments. Anorthosites were treated by acidified solutions of HCl, HN03 and H2S04 simulating acid rain and the response was recorded through different experiments such as on the surface of the polished rock and on the surface of uncovered thin sections. The main components, plagioclase and olivine, both responded in similar ways to each acid solution, although following different trends; while plagioclase develops a thin layer which acts as protection to the mineral, olivine at first undergoes alteration due to leaching of magnesium and iron and in a following stage, is mechanically removed from the rock. The action of warm water on the rock was tested through the use of the Soxhlet extractor which caused changes on the rock colour and leaching of several cations from its components.
publishDate 2010
dc.date.none.fl_str_mv 2010-12-28T15:08:11Z
2010-12-28
2010-12-28T00:00:00Z
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dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/4671
url http://hdl.handle.net/10362/4671
dc.language.iso.fl_str_mv eng
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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