Petrogénesis de los basaltos alcalinos de la Garrotxa, región volcánica del NE de España
Compositional trends and trace elements abundance in leucite-basanites, nepheline-basanites and olivíne basalts from la Garrotxa (NE Spain region), suggest that the parental magma were originated from an homogeneous lherzolite source, strongly enriched in incompatible elements (between x15-x4 the ch...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1986 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/3034 |
| Acceso en línea: | http://hdl.handle.net/10261/3034 |
| Access Level: | acceso abierto |
| Palabra clave: | Upper Mantle Mediterranean volcanism Leucite-basanites Nepheline-basanites Olivine basalts Partial melting Fractional crystallization |
| Sumario: | Compositional trends and trace elements abundance in leucite-basanites, nepheline-basanites and olivíne basalts from la Garrotxa (NE Spain region), suggest that the parental magma were originated from an homogeneous lherzolite source, strongly enriched in incompatible elements (between x15-x4 the chondritic values for the highly incompatible elements and between x5-x2 for the moderately incompatible), in which neither kaersutite, phlogopite or apatite remained as residual phases. The leucite-basanite magmas were derived by lower degrees of melting (7-10%) than the basanite s,s. and the olivine basalt magmas (13-15%). Except some primary leucite-basanites, the lavas from La Garrotxa underwent a moderate fractionation (~20%) of ol + cpx + mg, in proportion that range between 75-40%, 55-10% and 15-0 %, respectively. |
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