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
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.
|Uncontrolled Keywords:||Vulcanism, Olivine, Nephelinites, Partial meltin, Upper mantle|
|Subjects:||Sciences > Geology > Petrology|
|Deposited On:||22 Jan 2010 10:10|
|Last Modified:||22 Jan 2010 10:10|
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