J. Sagredo

Universidad de Burgos

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Mercedes Muñoz

Universidad Complutense de Madrid

Cristina de Ignacio

Universidad Complutense de Madrid

Soledad Fernández-Santín

Universidad Complutense de Madrid

J.M. Fúster

Universidad Complutense de Madrid

Javier Fernández‐Suárez

Universidad Complutense de Madrid

M. J. BENNELL-BAKER

Science Oxford

A. Páez

Teresa E. Jeffries

Natural History Museum

Ramón Vegas

Universidad Complutense de Madrid

C. J. Stillman

Trinity College Dublin

Cooperative Institutions

Universidad Complutense de Madrid

Instituto de Geociencias

Consejo Superior de Investigaciones Científicas

Memorial University of Newfoundland

Universidad de Granada

Universidad de Salamanca

Stellenbosch University

Goethe University Frankfurt

Universidad de Oviedo

Science Oxford

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New data (U–Pb, K–Ar) on the geochronology of the alkaline-carbonatitic association of Fuerteventura, Canary Islands, Spain

Lithos (2005)

Mercedes Muñoz J. Sagredo Cristina de Ignacio Javier Fernández‐Suárez Teresa E. Jeffries

Geochronology

Nepheline

Carbonatite

Nepheline syenite

10.1016/j.lithos.2005.03.024

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Citations (30)

Mineralogical and geochemical readjustments produced during contact metamorphism of basaltic dikes, Fuerteventura, Canary Islands

Mercedes Muñoz J. Sagredo

Dike

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Significance of basic and ultramafic rock inclusions in the basalts of Canary Islands

Bulletin of Volcanology (1969)

Joaquín M. Fuster A. Páez J. Sagredo

Ultramafic rock

Peridotite

Xenolith

Fractional crystallization (geology)

10.1007/bf02596745

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Citations (20)

Emplazamiento en una zona de cizalla dúctil - frágil transtensiva para el Plutón de Pájara, Fuerteventura, Islas Canarias

Geogaceta (1996)

Mercedes Muñoz J. Sagredo P. J. Rincón Calero Ramón Vegas

The mesostructures within the host-rocks as well as the internal deformation of the Pajara Pluton in Fuerteventura, allow the definition of a N 5-15 E directed ductile-brittle transtensive shear-zone, that conditioned the emplacement of the intrusive core represented by this plutonic body. We have indirectly estimaled an age of 22-21 Ma for this shear-zone, which is considered as coeval to the thermal metamorphism.

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Citations (7)

Carbonatites and associated nephelinites from São Vicente, Cape Verde Islands

Mineralogical Magazine (2012)

Cristina de Ignacio Mercedes Muñoz J. Sagredo

Abstract The island of São Vicente has the most abundant carbonatite outcrops in the Cape Verde Islands. A field survey of the main outcrops has shown that they consist of extrusive carbonatites, carbonatite dykes and small apophyses of intrusive carbonatite. These outcrops are spatially related to nephelinites. The compositions of the extrusive carbonatites and dykes plot close to, and within, the magnesiocarbonatite field. In contrast, the intrusive carbonatites are calciocarbonatites, with similar average strontium contents to those of extrusive carbonatites and dykes (around 4000 ppm), but remarkably low barium, niobium and total rare earth element concentrations. Whole-rock geochemistry indicates a strong affinity between the nephelinites and intrusive carbonatites, such that the latter could represent fractionation products of the same parental magma. This is in agreement with radiogenic isotope geochemistry, which shows a very restricted range of compositions in the Sr, Nd and Pb systems. Fractionation from a common parental magma occurred in two main steps: high-temperature nephelinite crystallization and high-temperature carbonatite immiscibility. The carbonatitic melts crystallized in two different environments, as follows: (1) a shallow intrusive environment, giving rise to the early calciocarbonatite cumulates; and (2) a vapour-dominated, extrusive environment, producing the later magnesiocarbonatites.

Carbonatite

Cape verde

Outcrop

Extrusive

Magma chamber

10.1180/minmag.2012.076.2.05

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Citations (25)

Basal complex of Fuerteventura (Canary Islands) is an oceanic intrusive complex with rift-system affinities

Nature (1975)

C. J. Stillman M. J. BENNELL-BAKER J. D. Smewing J.M. Fúster Mercedes Muñoz

Massif

Basement

10.1038/257469a0

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Citations (75)

Diferencias mineralógicas y geoquímicas del vulcanismo inicial de Fuerteventura

Geogaceta (2008)

Mercedes Muñoz J. Sagredo Cristina de Ignacio

The initial growth stage of the Fuerteventura Island is represented by submarine, transitional and subaerial volcanics. Among the submarine types, two can be distinguished: a basaltic (s.l.) one, and a basanitic one. The latter is characterized by the presence of hydrous ferromagnesian minerals (kaersutite, phlogopite) and a more alkaline character, whereas the former shows a less alkaline character that brings it closer to the subaerial group. All these groups would be generated from different partial melt degrees of a garnetbearing mantle source. However, for the basanitic group, also a shallower (oceanic lithosphere) melting and an amphibole-bearing source have to be invoked.

Subaerial

Phlogopite

Amphibole

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Isotope geochemistry and FOZO mantle component of the alkaline–carbonatitic association of Fuerteventura, Canary Islands, Spain

Chemical Geology (2006)

Cristina de Ignacio Mercedes Muñoz J. Sagredo Soledad Fernández-Santín Åke Johansson

Carbonatite

Cape verde

Nepheline

Nepheline syenite

10.1016/j.chemgeo.2006.02.009

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Citations (46)

Existencia de Zirconolita en la aureola de contacto del Plutón de Pájara. (Fuerteventura, Islas Canarias)

Geogaceta (1997)

J. Sagredo Alfonso Muñoz Martín

Zirconolite (CaZrTi2OJ is a rare accessory mineral, described in a wide range of rock types and geological environmehts.fhe chemical composition of zirconolite can vary extensively, with the main substitutions involving. REE, Nb,Y, U, Th y Fe. Zirconolite has been described from 46 terrestrial localities arid from 13 lunar samples, but it has not been reported in Spain. The zirconolite of Fuerteventura occurs in leucocratic vein from brecciaied zone, at the contact aureola of the Pajara pluion. It occurs as rims surrounding, zircon arid is considered to have been formed by metasomatic substitution of zircon with addition C.a, ti, Fe, REE, Nb, Ÿ, U y Th which were fractionated into the fluid during its separation frorti the melt

Zirconolite

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Reply to the comment by Demény, A., Casillas, R. and Ahijado, A., on the paper of de Ignacio, C., Muñoz, M., Sagredo, J., Fernández-Santín, S., and Johansson, Å., 2006. Isotope geochemistry and FOZO mantle component of the alkaline–carbonatitic association of Fuerteventura, Canary Islands, Spain. Chem Geol. 232, 99–113

Chemical Geology (2007)

Cristina de Ignacio Mercedes Muñoz J. Sagredo Soledad Fernández-Santín

10.1016/j.chemgeo.2007.04.001

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