Caracterización de las fuentes mantélicas de los magmas plio-cuaternarios de Gran Canaria (Islas Canarias)
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) mafi...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/53748 |
| Acceso en línea: | http://hdl.handle.net/10261/53748 |
| Access Level: | acceso abierto |
| Palabra clave: | Manto heterogéneo Componente piroxenítica Volcanismo Plio-Cuaternario Gran Canaria Islas Canarias |
| Sumario: | 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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