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Las rocas volcánicas neógenas de Nuévalos (provincia de Zaragoza)

Ancochea Soto, Eumenio and Muñoz García, Mercedes and Sagredo Ruiz, Juana (1987) Las rocas volcánicas neógenas de Nuévalos (provincia de Zaragoza). Geogaceta (3). pp. 7-10. ISSN 0213-683X

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Abstract

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 low degree of melting (4,3%) from a peridotitic mantle source, strongly enriched in incompatible elements, and from a depth near to 100 km.

Item Type:Article
Uncontrolled Keywords:Vulcanism, Olivine, Nephelinites, Partial meltin, Upper mantle
Subjects:Sciences > Geology > Petrology
ID Code:9873
Deposited On:22 Jan 2010 10:10
Last Modified:22 Jan 2010 10:10

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