Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2211
Título: Mantle source heterogeneity, magma generation and magmatic evolution at Terceira Island (Azoresarchipelago): Constraints from elemental and isotopic (Sr, Nd, Hf, and Pb) data
Autor: Madureira, Pedro
Mata, João
Mattielli, Nadine
Queiroz, Gabriela
Silva, Pedro
Palavras-chave: Ocean Island Basalts
Small-Scale Mantle Heterogeneity
Terceira Island
Azores
Cape-Verde Archipelago
Mid-Atlantic Ridge
Trace-element
Volcanic-Rocks
Sao-Miguel
Chemical Classification
Oceanic Lithosphere
Internal Structure
HE-3/HE-4 Ratios
Melt Segregation
Data: Out-2011
Editora: Elsevier Science BV
Citação: MADUREIRA, Pedro; MATA, João; MATTIELLI, Nadine; QUEIROZ, Gabriela; SILVA, Pedro - Mantle source heterogeneity, magma generation and magmatic evolution at Terceira Island (Azoresarchipelago): Constraints from elemental and isotopic (Sr, Nd, Hf, and Pb) data. Lithos. ISSN 0024-4937. Vol. 126, n.º 3-4 (2011) p.402-418.
Resumo: This work addresses the present-day (<100 ka) mantle heterogeneity in the Azores region through the study of two active volcanic systems from Terceira Island. Our study shows that mantle heterogeneities are detectable even when "coeval" volcanic systems (Santa Barbara and Fissural) erupted less than 10 km away. These volcanic systems, respectively, reflect the influence of the Terceira and D. Joao de Castro Bank end-members defined by Beier et at (2008) for the Terceira Rift Santa Barbara magmas are interpreted to be the result of mixing between a HIMU-type component, carried to the upper mantle by the Azores plume, and the regional depleted MORB magmas/source. Fissural lavas are characterized by higher Ba/Nb and Nb/U ratios and less radiogenic Pb-206/Pb-204, Nd-143/Nd-144 and Hf-176/Hf-177, requiring the small contribution of delaminated sub-continental lithospheric mantle residing in the upper mantle. Published noble gas data on lavas from both volcanic systems also indicate the presence of a relatively undegassed component, which is interpreted as inherited from a lower mantle reservoir sampled by the ascending Azores plume. As inferred from trace and major elements, melting began in the garnet stability field, while magma extraction occurred within the spinel zone. The intra-volcanic system's chemical heterogeneity is mainly explained by variable proportions of the above-mentioned local end-members and by crystal fractionation processes. (C) 2011 Elsevier By. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2211
ISSN: 0024-4937
Aparece nas colecções:ISEL - Eng. Civil - Artigos

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