2026-06-27T10:19:50Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/496172024-07-29T16:53:12Zcom_20.500.14352_14col_20.500.14352_15

Villaseca González, Carlos Orejana García, David Paterson, Bruce A. Billstrom, Kjell Pérez-Soba Aguilar, Cecilia María 2023-06-20T09:27:49Z 2023-06-20T09:27:49Z 2007 0935-1221 10.1127/0935-1221/2007/0019-1746 https://hdl.handle.net/20.500.14352/49617 http://www.schweizerbart.de/journals/ejm Basic and intermediate meta-igneous xenoliths are very scarce within the granulite population transported by the Permian alkaline lamprophyric dyke swarmof the Spanish Central System(SCS). These xenoliths aremetaluminous pyroxene-bearing charnockites (sensu lato). They show LREE-poor plagioclase and orthopyroxene-clinopyroxene. Crystallization conditions were estimated at about 850 to 1000 ◦C and 9 to 11 kbar, a slightly higher range than that estimated for the associated peraluminous granulites, but indicating derivation from the lowermost crust. Whole-rock geochemistry suggests that the charnockite samples are not a cogenetic suite. The more basic varieties have affinities with cumulates from previous calc-alkaline underplated protoliths, whereas intermediate charnockites have a restitic origin. The similarity in Sr-Nd-Pb isotopic signatures between these restitic charnockites and some SCS I-type granites suggests a genetic relationship. This study, including Pb isotopic data from the whole granulite xenolith suite, reinforces the lower-crustal derivation of the SCS Hercynian granitic batholith. eng open access Metaluminous pyroxene-bearing granulite xenoliths from the lower continental crust in central Spain: their role in the genesis of Hercynian I-type granites journal article