RT Journal Article
T1 Fluidos asociados a filones de cuarzo en la Sierra de Guadarrama. Sistema Central Español
T1 Fluids ¡n barren quartz veins from Sierra de Guadarrama. Spariish Central System
A1 Martín Crespo, Tomás
A1 López García, José Ángel
A1 Vindel, E.
AB Fluids together with alteration were studied in representative hydrothermal barren quartz veins from central part o f Sierra de Guadarrama (Spain). Three types o f fluids have been distinguished: (i) an early fluid stage characterized by primary H20 - C a C I2 two phase inclusions at room temperature ( L w l ) ; Te: -50/-40°C; Tm: -0.4/0°C and Th: 170/295°C. (ii) a secons stage characterized by H2Q-CaCI2-NaCI (MgCIJ inclusions two phase inclusions at room temperature (Lw2), they are primary in the borders of quartz crystals and secondary in the center; Te: is in the range of -65/-60°C; Tm:-24.2/-25,7°C and Th: 60-165°C. (Hi) later fluid inputs in the veins are shown by secondary high salinity H20-NaCI (CaCIJ inclusions (Lw-s); they are three phase inclusions including one or more solid phase (dominant halite and/or sylvine) with glogal homogenization ranges from 120- 260°C and salinity of 29-35 wt.%eq.NaCI. Barren quartz veins represents one of the latest event in the hydrothermal evolution of the Sierra de Guadarrama. Evolution of Ca contents is discussed in this paper. Quartz deposition is controlled by the decrease o f fl-T conditions
PB Sociedad Geológica de España
YR 1996
FD 1996
LK http://hdl.handle.net/10272/13217
UL http://hdl.handle.net/10272/13217
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026