Tera-Wasserburg diagrams showing the U-Pb compositions of cassiterite from pegmatites of the Fregeneda-Almendra field. The compositions of early, low-CL, and late, high-CL, cassiterite are distinguished for the Bajoca pegmatite (a). Ellipse and ages are reported at 2σ, with error between brackets including the long-term variance of cassiterite validation material (see Supplementary file for details). Ellipse color represents semi-quantitative U concentrations. Colorless ellipses interpreted as reflecting Pb or U losses were not used for age calculations. The concordia ages of the Plombal and Bajoca pegmatites were calculated considering cassiterite analyses with a degree of discordance ≤ 3%.