Las rocas volcánicas neógenas de Nuévalos (provincia de Zaragoza)
On the basis of petrological data, the ultra-alkaline character of the volcanics from Nuévalos is clearly pointed out. This character rejects any type of relationship with Permian and Mesozoic volcanic events. Furthermore, analogies with plio-quaternary volcanics from Cofrentes suggest a similar epi...
| Autores: | , , |
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| Formato: | artículo |
| Fecha de publicación: | 1987 |
| País: | España |
| Recursos: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | español |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/18425 |
| Acesso em linha: | http://hdl.handle.net/10272/18425 |
| Access Level: | acceso abierto |
| Palavra-chave: | Vulcanism Olivine nephelinites Partial melting Upper mande |
| Resumo: | On the basis of petrological data, the ultra-alkaline character of the volcanics from Nuévalos is clearly pointed out. This character rejects any type of relationship with Permian and Mesozoic volcanic events. Furthermore, analogies with plio-quaternary volcanics from Cofrentes suggest a similar episode related to a tensional regime that can be linked to the openning of the Valencia gulf. The volcanics are massive and look a porphyritic crystalline texture. Mineralogical composition define them as olivine-nephelinite rocks. They have a large amount of xenocrysts from mantle spinel-peridotite. The high xenocryst accumulation percentage has modified the original character of the primary melt The whole geochemical data suggest a parental magma derived by a very Iow degree of melting (4,3%) from a peridotitic mande source, strongly enriched in incompatible elements, and from a depth near to 700 km. |
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