Fenómenos de alteración mineralización en los yacimientos de Ba-F-(Pb-Zn-Cu-[Ag]) de la Sierra de Guadarrama
- Nicolás Mayor 1
- Rosario Lunar Hernández
- Roberto Oyarzun
- 1 Universidad Complutense (Facultad de Ciencias Geológicas. Departamento de Cristalografía y Mineralogía)
ISSN: 0210-6558
Any de publicació: 1989
Volum: 12
Número: 0
Pàgines: 273-282
Tipus: Article
Altres publicacions en: Boletín de la Sociedad Española de Mineralogía
Resum
This paper describes the epithermal vein-type Ba-F-(Pb-Zn-Cu-[Ag]) deposits of the Guadarrama Mountains (Spain). The hydrothermal alteration and mineralization display a zoning pattern including the following assemblages (from the flanks of the vein toward the “fresh” granitic country rock): silicification, quartz-sericite (± smectite), and propilytic alteration. Adularization occurs toward the bottom of the system. Ba, Ag and the alteration envelope increase toward the top of the vein system, while F increases toward the bottom. The genesis of these epithermal type deposits may be related to either late Hercynian or Triassic magmatic events.