Detalhes bibliográficos
| Resumo: | Sal Island (Cape Verde Archipelago) preserves a magmatic history ranging from ≈ 25.6 Ma to ≈ 0.6 Ma. The chemistry of magmatism varies from Hy-normative (Serra Negra basalts: ≈ 5 Ma) to highly SiO2 undersaturated (nephelinites and melilitites). The calculated temperatures of magmatic segregation are higher than those usually considered for the asthenosphere, thus endorsing the role of a mantle plume to the origin of Cape Verde magmatism. Nephelinites and melilitites are characterized by pronounced K negative anomalies which are interpreted as reflecting the interaction of plume magmas with the lithosphere. Some of the Sal lavas are characterized by low 143Nd/144Nd (down to 0.512577) - when compared with the HIMU component. These values are similar to those usually reported for the Southern Cape Verde Islands. This suggest the role of a EM1-type end-member to the magma sources of the Sal, which is for the first time evidenced from the whole rock composition of one of the Northern Cape Verde Islands. |
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| Autores principais: | Torres,P. |
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| Outros Autores: | Silva,L. C.; Munhá,J.; Caldeira,R.; Mata,J.; Tassinari,C. |
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| Assunto: | Cape Verde Archipelago Mantle plume EM1 HIMU Sal Island |
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| Ano: | 2010 |
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| País: | Portugal |
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| Tipo de documento: | artigo |
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| Tipo de acesso: | acesso aberto |
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| Instituição associada: | Fundação para a Ciência e Tecnologia |
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| Idioma: | inglês |
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| Origem: | SciELO Portugal |
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