Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts

Detalhes bibliográficos
Autor(a) principal: Costa, Raquel
Data de Publicação: 2008
Outros Autores: Mirão, José, Madureira, Pedro, Pinto Ribeiro, Luísa, Pimentel, Fernando, Pinto de Abreu, Manuel
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/2428
Resumo: Several dredge operations were sucessfully performed during the cruise EMEPC/Açores/G3/2007 along a track from the Azores to the Great Meteor seamounts covering also Plato and Hyeres seamounts. The recovered basaltic rocks are alkaline displaying mainly porphyritic textures with variable vesicularity and olivine, clinopyroxene ± plagioclase phenocrysts. Most samples contain thin veins or vesicles filled with calcite and/or zeolites and careful sample preparation was carried out to exclude low-temperature alteration signature on geochemical data. Following [1] incompatible element ratios (X/Th) were used to be compared with data from the Azores archipelago (GEOROC database) using Principal Component Analysis. Results show a coherent relationship between unaltered basalts from seamounts and those from the Azores Islands and supports previous models based on geophysical data linking these seamounts to the Azores hot spot activity during the last 85 Ma (e.g. [3]). However, the origin of the Azores hot spot is still strongly debated as a consequence of the high variablity in radiogenic isotopic ratios obtained for basalts from the Azores Islands. It is expected that isotopic analysis on samples from the Great Meteor seamounts will shed light on mantle source evolution and oceanic intraplate volcanism.
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spelling Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamountsMulti-variate geochemical analysisGreat MeteorSeveral dredge operations were sucessfully performed during the cruise EMEPC/Açores/G3/2007 along a track from the Azores to the Great Meteor seamounts covering also Plato and Hyeres seamounts. The recovered basaltic rocks are alkaline displaying mainly porphyritic textures with variable vesicularity and olivine, clinopyroxene ± plagioclase phenocrysts. Most samples contain thin veins or vesicles filled with calcite and/or zeolites and careful sample preparation was carried out to exclude low-temperature alteration signature on geochemical data. Following [1] incompatible element ratios (X/Th) were used to be compared with data from the Azores archipelago (GEOROC database) using Principal Component Analysis. Results show a coherent relationship between unaltered basalts from seamounts and those from the Azores Islands and supports previous models based on geophysical data linking these seamounts to the Azores hot spot activity during the last 85 Ma (e.g. [3]). However, the origin of the Azores hot spot is still strongly debated as a consequence of the high variablity in radiogenic isotopic ratios obtained for basalts from the Azores Islands. It is expected that isotopic analysis on samples from the Great Meteor seamounts will shed light on mantle source evolution and oceanic intraplate volcanism.Elsevier2011-01-10T15:09:14Z2011-01-102008-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article2077508 bytesapplication/pdfhttp://hdl.handle.net/10174/2428http://hdl.handle.net/10174/2428engGeochimica et Cosmochimica ActalivreDepartamento de Geociênciasrcosta@emepc-portugal.orgjmirao@uevora.ptpedro@uevora.ptluisapr@emepc-portugal.orgfmmpimentel@emepc-portugal.orgmapabreu@emepc-portugal.org396Costa, RaquelMirão, JoséMadureira, PedroPinto Ribeiro, LuísaPimentel, FernandoPinto de Abreu, Manuelinfo: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:RCAAP2024-01-03T18:38:49Zoai:dspace.uevora.pt:10174/2428Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:58:05.943053Repositório 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 Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
title Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
spellingShingle Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
Costa, Raquel
Multi-variate geochemical analysis
Great Meteor
title_short Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
title_full Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
title_fullStr Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
title_full_unstemmed Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
title_sort Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
author Costa, Raquel
author_facet Costa, Raquel
Mirão, José
Madureira, Pedro
Pinto Ribeiro, Luísa
Pimentel, Fernando
Pinto de Abreu, Manuel
author_role author
author2 Mirão, José
Madureira, Pedro
Pinto Ribeiro, Luísa
Pimentel, Fernando
Pinto de Abreu, Manuel
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Costa, Raquel
Mirão, José
Madureira, Pedro
Pinto Ribeiro, Luísa
Pimentel, Fernando
Pinto de Abreu, Manuel
dc.subject.por.fl_str_mv Multi-variate geochemical analysis
Great Meteor
topic Multi-variate geochemical analysis
Great Meteor
description Several dredge operations were sucessfully performed during the cruise EMEPC/Açores/G3/2007 along a track from the Azores to the Great Meteor seamounts covering also Plato and Hyeres seamounts. The recovered basaltic rocks are alkaline displaying mainly porphyritic textures with variable vesicularity and olivine, clinopyroxene ± plagioclase phenocrysts. Most samples contain thin veins or vesicles filled with calcite and/or zeolites and careful sample preparation was carried out to exclude low-temperature alteration signature on geochemical data. Following [1] incompatible element ratios (X/Th) were used to be compared with data from the Azores archipelago (GEOROC database) using Principal Component Analysis. Results show a coherent relationship between unaltered basalts from seamounts and those from the Azores Islands and supports previous models based on geophysical data linking these seamounts to the Azores hot spot activity during the last 85 Ma (e.g. [3]). However, the origin of the Azores hot spot is still strongly debated as a consequence of the high variablity in radiogenic isotopic ratios obtained for basalts from the Azores Islands. It is expected that isotopic analysis on samples from the Great Meteor seamounts will shed light on mantle source evolution and oceanic intraplate volcanism.
publishDate 2008
dc.date.none.fl_str_mv 2008-01-01T00:00:00Z
2011-01-10T15:09:14Z
2011-01-10
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/10174/2428
http://hdl.handle.net/10174/2428
url http://hdl.handle.net/10174/2428
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Geochimica et Cosmochimica Acta
livre
Departamento de Geociências
rcosta@emepc-portugal.org
jmirao@uevora.pt
pedro@uevora.pt
luisapr@emepc-portugal.org
fmmpimentel@emepc-portugal.org
mapabreu@emepc-portugal.org
396
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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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