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Compositional features and fractionation processes in the Centrai Volcanic Complex (I and I I) of Fuerteventura (Canary Islands)

dc.contributor.authorAncochea, Eumenio
dc.contributor.authorBrändle, José Luis
dc.contributor.authorHuertas, María José
dc.contributor.authorHernán, Francisco
dc.contributor.authorCubas, C. R.
dc.description.abstractThe Central Volcanic Complex / (CVC-I) consists mainly of mildly alkaline basalts, many of them ankaramitic. The compositional differences observed are explained by fractionation and extraction (rates between 20% and 30%) of dinopyroxene ( 60%), olivine (20-25%) and titanomagnetite. The CVC-ll shows two different stages. The lower one of mildly alkaline affinity has an age comprised between 20 and 22 Ma, the more alkalic upper one has a more recent age about 18Ma. The crystallization models for the lower stage are different depending on the composition considered to be the most primary or less differentiated magma. The crystallization rates are comprised between 20 and 30%. the compositional variation observed in the basalts from the upper stage maybe due to crystallization rates from 20-25%, mainly olivine (50-70%) and dinopyroxene. The transition to trachyandesites, both in the CVC-I and the CVC-II, supposes a change in crystallization which is then dominated by dinopyroxene and plagioclase. The further transition to trachytes is a process controlled by plagioclase extractionen_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherCanary Islandsen_US
dc.subject.otherOld Basaltic Seriesen_US
dc.titleCaracterísticas composícionales y procesos de evolución magmàtica en el Complejo Volcánico Central (I y II) de Fuerteventura (Islas Canarias)en_US
dc.titleCompositional features and fractionation processes in the Centrai Volcanic Complex (I and I I) of Fuerteventura (Canary Islands)eng

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