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

Laburpena

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 883-889 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.