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 olivine 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 documento: | artigo |
| Data de publicação: | 1986 |
| País: | España |
| Recursos: | Universidad de Huelva (UHU) |
| Repositório: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | espanhol |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/18504 |
| Acesso em linha: | http://hdl.handle.net/10272/18504 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Mediterranean volcanism Leucite-basanites Nepheline-basanites Olivine basalts Partial melting Fractional crystallization Upper Mantle |
| Resumo: | Compositional trends and trace elements abundance in leucite-basanites, nepheline basanites and olivine 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 01 + cpx + mg, in proportion that range between 75-40%, 55-10% and 15-0%, respectively |
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