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

Authors:Aulinas, M.
Gimeno, D.
Fernandez-Turiel, J. L.
Font, L.
Perez-Torrado, F. J.
Rodriguez-Gonzalez, A.
Nowell, G. M.
Keywords:Manto heterogéneo, Componente piroxenítica, Volcanismo Plio-Cuaternario, Gran Canaria, Islas Canarias
Issue Date:23-Jul-2012
Abstract:Chemical 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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