Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)

Detalhes bibliográficos
Autor(a) principal: Storey, Michael
Data de Publicação: 1982
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.3/4904
Resumo: International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.
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spelling Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)GeochemistryVolcanismSão Miguel Island (Azores)Água de PauInternational Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.The recent stratigraphy of São Miguel records large numbers of trachytic pyroclastic deposits produced by plinian to sub-plinian eruptions. Tephrochronological studies by Booth, Croasdale and Walker (1978) have shown that in the last five thousand years there have been five such eruptions from Agua de Pau, one of three active stratovolcanoes on São Miguel. A geochemical and electron microprobe study made on the resultant pyroclastic succession, revealed significant variations in pumice clast chemistry and mineralogy between the individual deposits. For example, Sr and Eu/Eu* decrease in value through the succession, whereas 'incompatible' elements such as La, Zr and Nb show stepwise enrichment attaining highest concentrations in the most recent deposit. The individual pyroclastic deposits are interpreted as representing successive samp1es of a body of trachyte magma undergoing appreciable crystal fractionation. However not ali of the observed chemical and mineralogical variations of the pyroclastic deposits are consistent with simple differentiation. For example, evidence is presented that trachyte magma has periodically mixed with intermediate and basaltic magmas. Magma mixing has found to be a recurrent feature of many of the lavas and pyroclastic deposits from Agua de Pau. Associated lavas possessing REE patterns with positive Eu anomalies and mineralogical peculiarities are also discussed. A case is made for the existence of a compositionally zoned magma chamber beneath Agua de Pau volcano.Universidade dos AçoresRepositório da Universidade dos AçoresStorey, Michael2018-11-29T11:56:51Z1982-071982-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.3/4904engSTOREY, Michael (1982). Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores). "Arquipélago. Série Ciências da Natureza", 3: 175-176.info: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:RCAAP2022-12-20T14:33:09Zoai:repositorio.uac.pt:10400.3/4904Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:27:13.724040Repositório 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 Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
title Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
spellingShingle Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
Storey, Michael
Geochemistry
Volcanism
São Miguel Island (Azores)
Água de Pau
title_short Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
title_full Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
title_fullStr Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
title_full_unstemmed Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
title_sort Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores)
author Storey, Michael
author_facet Storey, Michael
author_role author
dc.contributor.none.fl_str_mv Repositório da Universidade dos Açores
dc.contributor.author.fl_str_mv Storey, Michael
dc.subject.por.fl_str_mv Geochemistry
Volcanism
São Miguel Island (Azores)
Água de Pau
topic Geochemistry
Volcanism
São Miguel Island (Azores)
Água de Pau
description International Symposium on the Activity of Oceanic Volcanoes. Ponta Delgada, 4-9 August 1980.
publishDate 1982
dc.date.none.fl_str_mv 1982-07
1982-07-01T00:00:00Z
2018-11-29T11:56:51Z
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/10400.3/4904
url http://hdl.handle.net/10400.3/4904
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv STOREY, Michael (1982). Petrogenesis of the recent trachytic pyroclastic succession of Agua de Pau Volcano, (Sao Miguel, Azores). "Arquipélago. Série Ciências da Natureza", 3: 175-176.
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 Universidade dos Açores
publisher.none.fl_str_mv Universidade dos Açores
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
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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
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