| Título: | Petrogenesis of Ordovician Magmatism in the Pyrenees (Albera andCanigó Massifs) Determined on the Basis of Zircon Minorand Trace Element Composition |
| Autores: | Castiñeiras García, Pedro ; Navidad Fernández de la Cruz, Marina ; Casas Tuset, Josep María ; Liesa Torre Marín, Montserrat ; Carreras, Jordi |
| Tipo de documento: | texto impreso |
| Editorial: | University of Chicago Press, 2011 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
Zircon composition (U, Th, rare earth elements, and Hf) 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: (1) Casem?´ gneiss and Marialles amphibolite and (2) subvolcanic metaporphyries and Cad?´ and Sureda orthogneisses. Casem?´ gneiss and Marialles amphibolite from the Canigo´ massif have high Th, Th/U, and Ce/Sm and low Yb/Gd and U/Ce that define linear trends in most of the plots used. The anomalous trend of the data in the Th/U-versus-Hf plot suggests mantle involvement in the origin of these rocks and the participation of fractional crystallization during their evolution. Zircon of the metaporphyries and the Cad?´ and Sureda orthogneisses exhibit similar characteristics despite a difference in age. Zircon has low Th, Th/U, Ce/ Sm, and and high Yb/Gd and U/Ce, suggesting that this mineral grew in a melt formed by anatexis of a ? Eu/Eu continental crust, with stable plagioclase. These petrogenetic data are consistent with the previously studied wholerock geochemistry and Sr-Nd isotopes and confirmthe use of zircon as a marker of petrogenetic processes in preference to a lithological tracer. |
| En línea: | https://eprints.ucm.es/id/eprint/19944/1/Castineiras_et_al_%282011%29.pdf |
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