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