| Título: | Metaluminous pyroxene-bearing granulite xenoliths from the lowercontinental crust in central Spain: their role in the genesis of HercynianI-type granites |
| Autores: | Villaseca González, Carlos ; Orejana García, David ; Paterson, Bruce A. ; Billstrom, Kjell ; Pérez-Soba Aguilar, Cecilia |
| Tipo de documento: | texto impreso |
| Editorial: | E. Schweizerbart'sche Verlagsbuchhandlung, 2007 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
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. |
| En línea: | https://eprints.ucm.es/id/eprint/12409/1/EJM-07_01-.pdf |
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