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Title: Helium and Neon isotopic constraints to the lower mantle contribution for Terceira Island magmatism (Azores Archipelago)
Other Titles: Evidência isotópica (He e Ne) para o contributo do manto inferior no magmatismo da ilha Terceira (Açores)
Authors: Madureira, Pedro
Moreira, Manuel
Mata, João
Keywords: He and Ne
Plume-Ridge interaction, Azores
Issue Date: 2003
Publisher: Departamento de ciências da Terra e do Museu Mineralógico da Universidade de Coimbra
Abstract: We present the first neon data, as well as new helium isotopic analysis, for Terceira Island volcanic (Azores Archipelago, Portugal). Noble gases isotopic ratios show values more primitive than MORB, confirming that the Azores hotspot should be considered as sampling a relatively undegassed mantle reservoir. Our study also illustrates that the Ne systematic is more capable than He to constrain the ultimate origin of hotspots in geodynamic settings dominated by plume-ridge interaction. This is illustrated by the hyperbolic mixing inferred from the He-Ne isotopic diagram, where neon isotopic signatures show more efficiently than helium the influence of primitive undegassed material.
Type: article
Appears in Collections:CGE - Publicações - Artigos em Revistas Nacionais Com Arbitragem Científica
GEO - Publicações - Artigos em Revistas Nacionais Com Arbitragem Científica

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