Petrografía y química mineral de los enclaves de granulitas del volcán de La Encomienda (Campo Volcánico de Calatrava)

David  Orejana García; María García Rodríguez; Carlos Villaseca González

doi:10.55407/geogaceta95437

Authors

David Orejana García Departamento de Mineralogía y Petrología (Universidad Complutense de Madrid).
María García Rodríguez Departamento de Mineralogía y Petrología (Universidad Complutense de Madrid).
Carlos Villaseca González Departamento de Mineralogía y Petrología (Universidad Complutense de Madrid).

DOI:

https://doi.org/10.55407/geogaceta95437

Keywords:

Felsic granulites, Calatrava Volcanic Field, Lower crust, Mineral chemistry.

Abstract

The granulite xenoliths from the La Encomienda volcano (Calatrava Volcanic Field) represent a felsic peraluminous suite. Mineral chemistry allows estimating temperature and pressure conditions in the range of 862-889 ºC and 0.76-0.84 GPa, in accordance with a lower crustal derivation (25-28 km). These enclaves are charnockitic, metasedimentary and metagranitic granulites. Their petrography and mineral chemistry indicate an igneous (intermediate-acid composition) or sedimentary origin for the protoliths. When comparing with granulite xenoliths from the Spanish Central System (SCS), it is apparent that Calatrava granulites did not attain the ultra-high temperature conditions characteristic of the SCS xenoliths, although both regions point to a mainly felsic nature of the lower crust under the Central Iberian Zone.

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