Petrogenesis of highly fractionated I-type peraluminous granites : La Pedriza pluton (Spanish Central System)
Pérez-Soba Aguilar, Cecilia (Universidad Complutense de Madrid. Departamento de Petrología y Geoquímica)
Vilaseca, Carlos (Consejo Superior de Investigaciones Científicas (Espanya). Instituto de Geología Económica)

Fecha:	2010
Resumen:	The La Pedriza pluton stands out as the most extensively fractionated granite (Rb < 629; Sr < 2 and Ba < 2 ppm) of the Spanish Central System Batholith. These granites show a strong enrichment in some rare metal contents (Nb = 44, Y = 136, Yb = 10. 7, U = 17, Ta = 7, Sc = 15 ppm). The petrography and geochemistry (including Sr- Nd isotopes) reveal that the pluton is composed of at least four units. These are classified as I-type peraluminous leucogranites (A/CNK=1. 03-1. 17), P-poor (P2O5<0. 2 wt%) and Na2O-rich (< 4. 24 wt%) exhibiting differences in their HFSE and REE contents and ?Nd compositions. Moreover, the units of the La Pedriza granite display different trends of fractional crystallization. REE spectra of the two most fractionated units suggest the involvement of a fluorine-rich melt in the last stages favouring the crystallization of xenotime and niobotantalates. Intermediate meta-igneous granulite protoliths are proposed as source rocks. The most evolved units of the La Pedriza pluton show chemical features convergent to A-type granites; these are explained by extensive fraccional crystallization of a P-poor, I-type granite magma.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Hercynian-Variscan orogeny ; Peraluminous I-type granites ; High field strength elements ; Multiple intrusions
Publicado en:	Geologica acta, Vol. 8, Núm. 2 (Juny 2010) , p. 131-149, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/202689
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001527
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/1946
DOI: 10.1344/105.000001527

20 p, 870.7 KB

El registro aparece en las colecciones:
Artículos > Artículos publicados > Geologica acta
Artículos > Artículos de investigación