Citation: Timón-Sánchez, S.M., López-Moro, F.J., Romer, R.L., Rhede, D., Fernández-Fernández, A., Moro-Benito, C., 2019. Late-Variscan multistage hydrothermal processes unveiled by chemical ages coupled with compositional and textural uraninite variations in W-Au deposits in the western Spanish Central System Batholith. Geologica Acta, Vol.17.1, 1-19. DOI: 10.1344/GeologicaActa2019.17.1 Late-Variscan multistage hydrothermal processes unveiled by chemical ages coupled with compositional and textural uraninite variations in W-Au deposits in the western Spanish Central System Batholith S.M. Timón-Sánchez1 F.J. López-Moro2 R.L. Romer3 D. Rhede3 A. Fernández-Fernández2 C. Moro-Benito2 1Instituto Geológico y Minero de España, IGME Plaza de la Constitución 1, Planta 3ª, 37001 Salamanca, Spain. Timón-Sánchez E-mail:
[email protected] 2Departamento de Geología, Universidad de Salamanca Plaza de Los Caídos s/n, 37008 Salamanca, Spain. López-Moro E-mail:
[email protected] Fernández-Fernández E-mail:
[email protected] Moro-Benito E-mail:
[email protected] 3Deutsches GeoForschungsZentrum, GFZ Telegrafenberg 14473 Postdam, Germany. Romer E-mail:
[email protected] Rhede E-mail:
[email protected] Moro-Benito E-mail:
[email protected] ABS TRACT The scheelite skarn from Los Santos and the W-Au veins from El Cabaco district, located in the Spanish Central System Batholith (SCSB), are some of the best-known tungsten ore deposits in Spain. Uraninite is an accessory mineral in both deposits, which underwent several hydrothermal flow events. Chemical and textural characteristics as well as electron microprobe U-Th-Pb uraninite chemical data from the different stages of the skarn and the vein-type mineralizations are presented here.