He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo de conferência |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/3219 |
Resumo: | We present He and Ne isotopic data from subaerial and submarine samples collected along the Terceira Rift. Graciosa Island as well as the western end of S. Miguel Island and D. João de Castro Bank display 4He/3He ratios similar to those observed along the MAR segments located to the north of the Azores Triple Junction area. Conversely, samples from the south Hirondelle Basin display a 4He/3He ratio similar to that of the MAR segments located to the south of the Azores Plateau. The Terceira Rift is thus characterized by the mingling of two different mantle domains referred as ‘Eurasia’ and ‘Nubia’ type. He and Ne systematics shows that the influence of the relatively primitive source sampled by the Azores plume can be followed along the Terceira Rift from the Graciosa Island towards the south Hirondelle Basin. Moreover, samples from the south Hirondelle Basin, D. João de Castro Bank and Graciosa Island cannot be explained by the same hyperbolic mixing model that encloses Terceira data. |
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He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sourcesNoble Gases (He, Ne)Terceira RiftWe present He and Ne isotopic data from subaerial and submarine samples collected along the Terceira Rift. Graciosa Island as well as the western end of S. Miguel Island and D. João de Castro Bank display 4He/3He ratios similar to those observed along the MAR segments located to the north of the Azores Triple Junction area. Conversely, samples from the south Hirondelle Basin display a 4He/3He ratio similar to that of the MAR segments located to the south of the Azores Plateau. The Terceira Rift is thus characterized by the mingling of two different mantle domains referred as ‘Eurasia’ and ‘Nubia’ type. He and Ne systematics shows that the influence of the relatively primitive source sampled by the Azores plume can be followed along the Terceira Rift from the Graciosa Island towards the south Hirondelle Basin. Moreover, samples from the south Hirondelle Basin, D. João de Castro Bank and Graciosa Island cannot be explained by the same hyperbolic mixing model that encloses Terceira data.2012-01-10T17:09:29Z2012-01-102011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/3219http://hdl.handle.net/10174/3219pornaonaosimpedro@uevora.ptmoreira@ipgp.frjcnunes@notes.uac.ptnlourenco@am-em.orgcecile.gautheron@u-psud.frmdrcarvalho@fc.ul.ptjmata@fc.ul.ptmapabreu@am-em.org247Madureira, PedroMoreira, ManuelNunes, João CarlosLourenço, NunoGautheron, CécileCarvalho, Maria do RosárioMata, JoãoPinto 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:RCAAP2023-08-08T03:46:25ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources |
title |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources |
spellingShingle |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources Madureira, Pedro Noble Gases (He, Ne) Terceira Rift |
title_short |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources |
title_full |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources |
title_fullStr |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources |
title_full_unstemmed |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources |
title_sort |
He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the boundary between Eurasia and Nubia mantle sources |
author |
Madureira, Pedro |
author_facet |
Madureira, Pedro Moreira, Manuel Nunes, João Carlos Lourenço, Nuno Gautheron, Cécile Carvalho, Maria do Rosário Mata, João Pinto de Abreu, Manuel |
author_role |
author |
author2 |
Moreira, Manuel Nunes, João Carlos Lourenço, Nuno Gautheron, Cécile Carvalho, Maria do Rosário Mata, João Pinto de Abreu, Manuel |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Madureira, Pedro Moreira, Manuel Nunes, João Carlos Lourenço, Nuno Gautheron, Cécile Carvalho, Maria do Rosário Mata, João Pinto de Abreu, Manuel |
dc.subject.por.fl_str_mv |
Noble Gases (He, Ne) Terceira Rift |
topic |
Noble Gases (He, Ne) Terceira Rift |
description |
We present He and Ne isotopic data from subaerial and submarine samples collected along the Terceira Rift. Graciosa Island as well as the western end of S. Miguel Island and D. João de Castro Bank display 4He/3He ratios similar to those observed along the MAR segments located to the north of the Azores Triple Junction area. Conversely, samples from the south Hirondelle Basin display a 4He/3He ratio similar to that of the MAR segments located to the south of the Azores Plateau. The Terceira Rift is thus characterized by the mingling of two different mantle domains referred as ‘Eurasia’ and ‘Nubia’ type. He and Ne systematics shows that the influence of the relatively primitive source sampled by the Azores plume can be followed along the Terceira Rift from the Graciosa Island towards the south Hirondelle Basin. Moreover, samples from the south Hirondelle Basin, D. João de Castro Bank and Graciosa Island cannot be explained by the same hyperbolic mixing model that encloses Terceira data. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-01-01T00:00:00Z 2012-01-10T17:09:29Z 2012-01-10 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/3219 http://hdl.handle.net/10174/3219 |
url |
http://hdl.handle.net/10174/3219 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
nao nao sim pedro@uevora.pt moreira@ipgp.fr jcnunes@notes.uac.pt nlourenco@am-em.org cecile.gautheron@u-psud.fr mdrcarvalho@fc.ul.pt jmata@fc.ul.pt mapabreu@am-em.org 247 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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1777304571717091328 |