Contenido y variación de las tierras raras en los granitoides tardihercinicos de la Sierra de Guadarrama. (S.C.E.)
- Ramón Casillas Ruiz
- José Luis Brandle Matesanz
- María José Huertas Coronel
- Mercedes Peinado Moreno
- Cecilia Pérez-Soba Aguilar
- Carlos Villaseca González
ISSN: 0210-6558
Year of publication: 1991
Volume: 14
Issue: 0
Pages: 261-271
Type: Article
More publications in: Boletín de la Sociedad Española de Mineralogía
Abstract
This paper deals with REE and related trace elements behaviour in the tardihercynian granitoids of the eastern Spanish Central System.Seven different plutonic groups have been established, whose composition varies from basic and intermediate types to leucogranites, through granodiorites and monzogranites. In the whole of rocks, as well as in each group of them, the £REE, together with the REE fracionation degree decrease when silica content increases, beyond 62%; at the same time, the Eu negative anomaly increases .These facts are discussed in terms of accesory minerals contents and feldspars crystallization, respectively .The REE contents and particular ratios of several REE elements in allanites and monazites show different values in every granitic group, this variation being the main fact that determines the pattern in the host granitic group. In somme of most differentiated rocks there are somme variations due to late hydrothermal fluids leaching.