Multi-variate analysis of elemental data from the Azores archipelago and Great Meteor seamounts
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , , |
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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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 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
2077508 bytes application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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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1817551309390217216 |