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Caracterización de las fuentes mantélicas de los magmas plio-cuaternarios de Gran Canaria (Islas Canarias)

AuthorsAulinas, M.; Gimeno, D.; Fernandez-Turiel, J. L. ; Font, L.; Pérez-Torrado, F. J.; Rodríguez-González, A. ; Nowell, G. M.
KeywordsManto heterogéneo
Componente piroxenítica
Volcanismo Plio-Cuaternario
Gran Canaria
Islas Canarias
Issue Date23-Jul-2012
AbstractChemical and Sr-Nd-Pb isotopic data of the plio-quaternary mafic lavas of Gran Canaria (Canary Islands, Spain) are used to investigate the composition of their mantle source. The isotopic differences between the plio-quaternary (Post-Roque Nublo Group) and the older pliocene (Roque Nublo Group) mafic parental magmas reflect small-scale mantle heterogeneities. Two distinct mantle components were involved in partial melting to form the plio-quaternary magmas of Gran Canaria, the first being isotopically more depleted and similar to the DMM type and the second being more radiogenic in Pb-isotope ratios comparable to an HIMU type. Geochemical variations show that the plio-quaternary mantle source is not only compositionally but also lithologically heterogeneous and supports the presence of a silica-deficient pyroxenite mantle component. The proposed scenario for the generation of the plio-quaternary magmas involves a lithologically heteorogenous mantle plume consisting of pyroxenite veins in a peridotite matrix.
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