Fig. 3: Principal component analysis of incompatible element concentrations.
From: Global influence of mantle temperature and plate thickness on intraplate volcanism
a Average elemental weightings, λ1, for first principal component, P1. Database 1 is screened and binned as described in caption of Fig. 2 before being mean-centered and variance-scaled. Colored line with shaded band = average value of λ1 for each element with range of weighting for 99 binning configurations. In this case, band is narrower than width of line. Proportion of variance described by P1 is given in bottom left-hand corner. b Same for P2. c Same for P3. d Average elemental weightings for first principal component, M1, generated using synthetic model that was run 99 times for appropriate range of Tp, lithospheric thickness, and mantle composition. Colored line/shaded band = average value/range of λ1 for each element. e Same for M2. f Same for M3.
