Table S5: Model sources and normalizations Altered Depleted Primitve Element Basalt* Mantle# Mantle@ Cs 0.012 0.00099 0.021 Rb 0.59 0.05 0.6 Ba 1.65 0.563 6.6 Th 0.11 0.0079 0.0795 U 0.025 0.0032 0.0203 Nb 0.42 0.1485 0.658 K 283 60 240 La 1.09 0.192 0.648 Ce 3.52 0.55 1.675 Pb 0.362 0.0232 0.15 Pr 0.66 0.107 0.254 Nd 4.04 0.581 1.25 Zr 30.9 5.082 10.5 Sr 43.1 7.664 19.9 Sm 1.87 0.239 0.406 Eu 0.77 0.096 0.154 Gd 2.91 0.358 0.544 Tb 0.58 0.07 0.099 Dy 4.04 0.505 0.674 Ti 4988 716.3 1205 Y 17.6 3.328 4.3 Er 2.61 0.348 0.438 Yb 2.36 0.365 0.441 * Bach et al., 2003 # Workman and Hart, 2005; interpolated for Cs, K and Pb @ McDonough and Sun, 1995 All values in parts per million, by mass