Complutense University Library

Características composicionales y procesos de evolución magmática en el Complejo Volcánico Central (I y II) de Fuerteventura (Islas Canarias)

Ancochea Soto, Eumenio and Brandle, J.L. and Huertas Coronel, María José and Hernán, F. and Cubas, C.R. (1997) Características composicionales y procesos de evolución magmática en el Complejo Volcánico Central (I y II) de Fuerteventura (Islas Canarias). Geogaceta (21). pp. 13-16. ISSN 0213-683X

[img] PDF
297kB

Official URL: http://www.sociedadgeologica.es/

View download statistics for this eprint

==>>> Export to other formats

Abstract

The Central Vólcanic Complex I (CVC-I) consists maihly of mildly alkaline basalts, many of them
ankaramitic. The compositional differences observed are explained by fractíonation and extraction
(rates between 20% and 30%) of clinopyroxene (60%), olivine (20-25%) and titanomagnetite. The CVC-II
shows two different stages. The lower one of mildly alkaline affiníty has an age comprised between 20
and 22 Ma, the more alkalic: upper orle has a mote 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 may be due to crystallization rates from 20-25%,
mainly olivine (50c70%) and clinopyroxene. The transition to trachyandesites, both in the CVC-I and
the CVC-II¡ supposes a change in crystallization which is then dominated by cilinopyroxene and
plagioclase. The further transition to trachytes is a process controlled by plagioclase extraction.

Item Type:Article
Uncontrolled Keywords:Canary Islands, Fuerteventura, Old Basaltic Series, Geochemistry
Subjects:Sciences > Geology > Petrology
ID Code:9922
Deposited On:04 Feb 2010 12:10
Last Modified:01 Mar 2010 11:58

Repository Staff Only: item control page