Características geoquímicas de los granitos ricos en sílice de la Sierra de Guadarrama y su papel en la génesis de mineralizaciones de metales raros
- Carlos Villaseca González
- José Luis Brandle Matesanz
- Ramón Casillas Ruiz 1
- Cecilia Pérez-Soba Aguilar
- 1 Universidad Complutense de Madrid (Facultad de Ciencias Geológicas. Departamento de Petrología y Geoquímica)
ISSN: 0210-6558
Argitalpen urtea: 1991
Alea: 14
Zenbakia: 0
Orrialdeak: 249-260
Mota: Artikulua
Beste argitalpen batzuk: Boletín de la Sociedad Española de Mineralogía
Laburpena
In the Sierra de Guadarrama the most acid granite plutons are late hercynian. They show similar geochemical features with peral urn inous granites related to Nb-Ta and Sn-W mineralizations. They have low contents in Mg, Ca, Ti, Sr, Ba, Zr, Eu and high Si, K, Rb. Some (Sn-W) mineralizations are genetically related to these plutons. The scarce datas in some HFS elements point to two contrasted evolutionary trends. One group of this high-Si02 granites tends to high contents in Nb, Y, REE (Pedriza type), while others (the most peralouminous leucogranites: Cabeza Mediana, Hoyo de Pinares) show a decreasing trend. This different geochemical evolution are discussed in terms of divergent specialization in rare metals mineralizations.