Major tin-tungsten deposits in Portugal are related to intrusions of
the Younger Series (300-280 Ma) of Hercynian granitoids. Mineralized
granites are 'specialized' by a specific increase or decrease of major,
minor and trace element contents in comparison with non-mineralized
occurrences. Component analysis is used to make distinctions between
the various geochemical types of barren and mineralized granites
(Chapter 2). A one-component model is characterized by positive
loadings for Rb, Sn, Cs, Li, Nb, F, Ta, Zn, Wand P20S and negative
loadings for Zr, Ba, Ti02 and Sr.