RT Journal Article
T1 Metaluminous pyroxene-bearing granulite xenoliths from the lowercontinental crust in central Spain: their role in the genesis of HercynianI-type granites
A1 Villaseca González, Carlos
A1 Orejana García, David
A1 Paterson, Bruce A.
A1 Billstrom, Kjell
A1 Pérez-Soba Aguilar, Cecilia María
AB 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.
PB E. Schweizerbart'sche Verlagsbuchhandlung
SN 0935-1221
YR 2007
FD 2007
LK https://hdl.handle.net/20.500.14352/49617
UL https://hdl.handle.net/20.500.14352/49617
LA eng
DS Docta Complutense
RD 11 jul 2025