RT Journal Article
T1 The Esquinzo ultra-qlkaline rock suite of Fuerteventura Basal Complex (Canary Islands): evidence for origin of carbonatites by fractional crystallization
A1 Casillas, Ramón
AB The origin of the carbonatites that appear on Earth is one of the most controversial current topics in the petrogenesis of igneous rocks. Situated in the northern sector of the Basal Complex of Fuerteventura (Canary Islands), the Miocene Esquinzo ultra-alkaline plutonic rock complex is composed of pyroxenites, melteigites-ijolites-urtites, malignites-nepheline syenites, carbonatites, silicocarbonatites, nephelinites and nepheline phonolites. This work tries to establish the genesis of this massif of ultra-alkaline rocks with associated carbonatites from Fuerteventura (which are very rare in the oceans). The geochemical characteristics of these rocks and the minerals that are included in them have allowed us to establish their origin. This complex was generated by three successive magmatic events associated with differentiation of melanephelinite magmas emplaced in the oceanic crust. Silicocarbonatite and calciocarbonatite (sövites) dykes are related to the first magmatic event and were formed by fractional crystallization of H2O- and CO2-rich ijolite magmas. The melanephelinite magmas that formed these plutonic ultra-alkaline rocks were apparently generated as partial melts of asthenospheric mantle, which assimilated enriched lithospheric mantle material as they ascended. The upwelling of this large body of anomalous asthenospheric Miocene material exceeded the deformation associated with plate motions and led to an oceanic rifting event in Fuerteventura.
PB MDPI
YR 2024
FD 2024
LK https://hdl.handle.net/20.500.14352/102789
UL https://hdl.handle.net/20.500.14352/102789
LA eng
NO Ministerio de Educación y Ciencia
NO Ministerio de Ciencia e Innovación
NO Agencia Canaria de Investigación, Innovación y Sociedad de la Información
NO Integrated Action between Hungary and Spain
DS Docta Complutense
RD 6 abr 2025