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- W3205457755 abstract "espanolZircon composition was tested as a tracer of petrogenetic processes in a set of metaigneous rocks from two pre-Ordovician massifs in the Pyrenees, Canigo and Albera. Two groups were differentiated after analyzing a number of elements in zircon: a) Casemi gneiss and the Marialles amphibolite, and b) subvolcanic metaporphyries and Cadi 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 Cadi 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. EnglishSe ha puesto a prueba la composicion del circon como trazador de procesos petrogeneticos en un conjuto de rocas metaigneas de dos macizos pre-Ordovicicos en Pirineos, Canigo y Albera. Despues de analizar una serie de elementos en el circon se han distinguido dos grupos: a) gneiss de Casemi y anfibolita de Marialles, y b) metaporfidos subvolcanicos y ortogneisses de Cadi y Sureda. La pauta anomala de los datos del primer grupo en el grafico Th/U frente a Hf sugiere una implicacion del manto en el origen de estas rocas y la participacion de cristalizacion fraccionada durante su evolucion. Los circones de las rocas del segundo grupo tienen caracteristicas similares, a pesar de la diferencia de edad, que sugieren que este mineral crecio en un fundido formado por fusion parcial de una corteza continental con plagioclasa estable. Estos datos petrogeneticos son consistentes con la geoquimica de roca total y los isotopos de Sr y Nd estudiados previamente y confirman el uso de circon como marcador de procesos petrogeneticos en vez de trazador litologico." @default.
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- W3205457755 date "2012-01-01" @default.
- W3205457755 modified "2023-09-24" @default.
- W3205457755 title "Petrogenesis of Ordovician magmatism in the Pyrenees (Albera and Canigó massifs) based on zircon minor and trace element composition" @default.
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