He and Ne isotopic ratios along the Terceira Rift: implications for the Azores mantle source
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , , , |
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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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 |
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/10174/2429 http://hdl.handle.net/10174/2429 |
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 sim 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 606 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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37329 bytes application/pdf |
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