He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source

Detalhes bibliográficos
Autor(a) principal: Madureira, Pedro
Data de Publicação: 2010
Outros Autores: Moreira, Manuel, Nunes, João, Lourenço, Nuno, Carvalho, Maria do Rosário, Mata, João, Pinto de Abreu, Manuel
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/2429
Resumo: Noble gas data (He and Ne) on olivine phenocrysts obtained from Azores’ lavas sampled along the Terceira Rift will be presented in this work. The Terceira Rift is considered as one of the slowest spreading system in the world (Vogt & Jung, 2004). Lava samples were collected inland at S. Miguel, Terceira, Graciosa, Pico and Faial Islands as well at sea at D. João de Castro Bank and south Hirondelle basin, the latter being sampled by the ROV cruises in 2008 and 2009. Noble gas data were analyzed in the Noblesse mass spectrometer housed at the IPGP. The most primitive He isotopic ratios were obtained from Pico, Terceira and Hirondelle olivines. Most Ne isotopic ratios are similar to the present-day atmosphere, but distinct 20Ne/22Ne ratios were found for the majority of submarine samples and also Pico and Faial Islands, defining mixing lines with the atmospheric end-member with slopes greater than that defined from MORB lavas. The He-Ne systematics shows that most of the new noble gas data fit in a mixing model between a dominant MORB-type mantle source and a relatively primitive mantle source related with the regional Azores component. However, data from the D. João de Castro Bank argue for the presence of a radiogenic He end-member distinct from MORB.
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spelling He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle sourceHe and NeTerceira RiftNoble gas data (He and Ne) on olivine phenocrysts obtained from Azores’ lavas sampled along the Terceira Rift will be presented in this work. The Terceira Rift is considered as one of the slowest spreading system in the world (Vogt & Jung, 2004). Lava samples were collected inland at S. Miguel, Terceira, Graciosa, Pico and Faial Islands as well at sea at D. João de Castro Bank and south Hirondelle basin, the latter being sampled by the ROV cruises in 2008 and 2009. Noble gas data were analyzed in the Noblesse mass spectrometer housed at the IPGP. The most primitive He isotopic ratios were obtained from Pico, Terceira and Hirondelle olivines. Most Ne isotopic ratios are similar to the present-day atmosphere, but distinct 20Ne/22Ne ratios were found for the majority of submarine samples and also Pico and Faial Islands, defining mixing lines with the atmospheric end-member with slopes greater than that defined from MORB lavas. The He-Ne systematics shows that most of the new noble gas data fit in a mixing model between a dominant MORB-type mantle source and a relatively primitive mantle source related with the regional Azores component. However, data from the D. João de Castro Bank argue for the presence of a radiogenic He end-member distinct from MORB.2011-01-10T15:11:19Z2011-01-102010-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject37329 bytesapplication/pdfhttp://hdl.handle.net/10174/2429http://hdl.handle.net/10174/2429engAGU Fall meeting 2010, São Francisco, EUAHe and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle sourcenaonaosimlivreDepartamento de Geociênciaspedro@uevora.ptmoreira@ipgp.frjcnunes@uac.ptnlourenco@emepc-portugal.orgmdrcarvalho@fc.ul.ptjmata@fc.ul.ptmapa@emepc-portugal.org606Madureira, PedroMoreira, ManuelNunes, JoãoLourenço, NunoCarvalho, 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:RCAAP2023-08-08T03:45:49ZPortal AgregadorONG
dc.title.none.fl_str_mv He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
title He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
spellingShingle He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
Madureira, Pedro
He and Ne
Terceira Rift
title_short He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
title_full He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
title_fullStr He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
title_full_unstemmed He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
title_sort He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
author Madureira, Pedro
author_facet Madureira, Pedro
Moreira, Manuel
Nunes, João
Lourenço, Nuno
Carvalho, Maria do Rosário
Mata, João
Pinto de Abreu, Manuel
author_role author
author2 Moreira, Manuel
Nunes, João
Lourenço, Nuno
Carvalho, Maria do Rosário
Mata, João
Pinto de Abreu, Manuel
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Madureira, Pedro
Moreira, Manuel
Nunes, João
Lourenço, Nuno
Carvalho, Maria do Rosário
Mata, João
Pinto de Abreu, Manuel
dc.subject.por.fl_str_mv He and Ne
Terceira Rift
topic He and Ne
Terceira Rift
description Noble gas data (He and Ne) on olivine phenocrysts obtained from Azores’ lavas sampled along the Terceira Rift will be presented in this work. The Terceira Rift is considered as one of the slowest spreading system in the world (Vogt & Jung, 2004). Lava samples were collected inland at S. Miguel, Terceira, Graciosa, Pico and Faial Islands as well at sea at D. João de Castro Bank and south Hirondelle basin, the latter being sampled by the ROV cruises in 2008 and 2009. Noble gas data were analyzed in the Noblesse mass spectrometer housed at the IPGP. The most primitive He isotopic ratios were obtained from Pico, Terceira and Hirondelle olivines. Most Ne isotopic ratios are similar to the present-day atmosphere, but distinct 20Ne/22Ne ratios were found for the majority of submarine samples and also Pico and Faial Islands, defining mixing lines with the atmospheric end-member with slopes greater than that defined from MORB lavas. The He-Ne systematics shows that most of the new noble gas data fit in a mixing model between a dominant MORB-type mantle source and a relatively primitive mantle source related with the regional Azores component. However, data from the D. João de Castro Bank argue for the presence of a radiogenic He end-member distinct from MORB.
publishDate 2010
dc.date.none.fl_str_mv 2010-01-01T00:00:00Z
2011-01-10T15:11:19Z
2011-01-10
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/2429
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url http://hdl.handle.net/10174/2429
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv AGU Fall meeting 2010, São Francisco, EUA
He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
nao
nao
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livre
Departamento de Geociências
pedro@uevora.pt
moreira@ipgp.fr
jcnunes@uac.pt
nlourenco@emepc-portugal.org
mdrcarvalho@fc.ul.pt
jmata@fc.ul.pt
mapa@emepc-portugal.org
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