(a) PC1 vs. PC2 projection plane displaying results of principal components analysis (PCA) performed on the main trace elements composing the different generations of quartz occurring in the two-mica granite, the greisen and the mineralized veins of Panasqueira. (b) to (g) Chemical evolution trends from magmatic to hydrothermal quartz displaying the behavior of Ti, Al, Ge, Li, Rb and B during magmatic-hydrothermal evolution of the Panasqueira ore deposit.