Fig. 7

Provenance discriminant function (DF) diagram for the Barra del Tordo and Tesoro beach sediments (modified after Roser and Korsch 1988). DF 1 = (− 1.773·TiO₂) + (0.607·Al₂O₃) + (0.760·Fe₂O₃) + (− 1.500·MgO) + (0.616·CaO) + (0.509·Na₂O) + (− 1.224·K₂O) + (− 9.090); DF 2 = (0.445·TiO₂) + (0.070·Al₂O₃) + (− 0.250·Fe₂O₃) + (− 1.142·MgO) + (0.438·CaO) + (1.475·Na₂O) + (1.426·K₂O) + (− 6.861)