%0 Journal Article
%A Villaseca González, Carlos
%A Orejana García, David
%A Paterson, Bruce A.
%A Billstrom, Kjell
%A Pérez-Soba Aguilar, Cecilia María
%T Metaluminous pyroxene-bearing granulite xenoliths from the lowercontinental crust in central Spain: their role in the genesis of HercynianI-type granites
%D 2007
%@ 0935-1221
%U https://hdl.handle.net/20.500.14352/49617
%X Basic and intermediate meta-igneous xenoliths are very scarce within the granulite population transported by the Permianalkaline lamprophyric dyke swarmof the Spanish Central System(SCS). These xenoliths aremetaluminous pyroxene-bearingcharnockites (sensu lato). They show LREE-poor plagioclase and orthopyroxene-clinopyroxene. Crystallization conditions wereestimated at about 850 to 1000 ◦C and 9 to 11 kbar, a slightly higher range than that estimated for the associated peraluminousgranulites, 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 affinitieswith cumulates from previous calc-alkaline underplated protoliths, whereas intermediate charnockites have a restitic origin. Thesimilarity in Sr-Nd-Pb isotopic signatures between these restitic charnockites and some SCS I-type granites suggests a geneticrelationship. This study, including Pb isotopic data from the whole granulite xenolith suite, reinforces the lower-crustal derivationof the SCS Hercynian granitic batholith.
%~