Petrogenesis of Ordovician magmatism in the Pyrenees (Albera and Canigó massifs) based on zircon minor and trace element composition
- P. Castiñeiras 1
- M. Navidad 1
- J.M. Casas 2
- M. Liesa 2
- J. Carreras 3
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1
Universidad Complutense de Madrid
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2
Universitat de Barcelona
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3
Universitat Autònoma de Barcelona
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ISSN: 1576-5172
Año de publicación: 2012
Título del ejemplar: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Número: 13
Páginas: 774-777
Tipo: Artículo
Otras publicaciones en: Geotemas (Madrid)
Resumen
Zircon composition was tested as a tracer of petrogenetic processes in a set of metaigneous rocks from two pre-Ordovician massifs in the Pyrenees, Canigó and Albera. Two groups were differentiated after analyzing a number of elements in zircon: a) Casemí gneiss and the Marialles amphibolite, and b) subvolcanic metaporphyries and Cadí and Sureda orthogneisses. The anomalous trend of the first group data in the Th/U versus Hf plot suggests a mantle involvement in the origin of these rocks and the participation of fractional crystallization during their evolution. Zircon of the metaporphyries and Cadí and Sureda orthogneisses exhibit similar characteristics despite a difference in age, which suggest that this mineral grew in a melt formed by anatexis of a continental crust, with stable plagioclase. These petrogenetic data are consistent with the previously studied whole-rock geochemistry and Sr-Nd isotopes and confirm the use of zircon as a marker of petrogenetic processes in preference to a lithological tracer.