DATA REPOSITORY Table IV: Trace element concentrations in clinopyroxene from two layered gabbros determined by Laser Ablation ICP-MS.
	A25/7-5 (n=10)	1 variation	d.l.	A4/8-8 (n=10)	1 variation	d.l.	NIST 612	solid/meltD3	
Cs	0.03	0.02	0.006	1.05	0.25	0.002	41.70		
Ba	0.89	0.69	0.044	4.27	0.90	0.017	37.76	0.0006	
Rb	0.50	0.34	0.069	6.21	1.89	0.063	31.63	0.011	
Th	0.02	0.01	0.004	<0.003‡	-	0.001	37.35	0.012	
U	0.01	0.002	0.003	<0.003‡	-	0.001	37.20	0.0103	
Nb	<0.04‡	-	0.012	<0.01‡	-	0.003	38.10	0.0093	
La	0.07	0.01	0.005	0.15	0.01	0.002	35.87	0.0621	
Ce	0.41	0.05	0.006	0.83	0.05	0.002	38.42	0.0893	
Pb	0.08	0.02	0.014	0.31	0.10	0.006	38.89	0.0087	
Pr	0.09	0.01	0.005	0.19	0.01	0.002	37.18	0.124	
Sr	12.6	7.1	0.013	18.5	17.2	0.004	76.18	0.124	
Nd	0.65	0.11	0.039	1.31	0.07	0.013	35.26	0.164	
Sm	0.28	0.04	0.034	0.57	0.04	0.011	36.76	0.247	
Zr	1.70	0.23	0.087	2.45	0.19	0.028	36.12		
Hf	0.06	0.02	0.018	0.17	0.03	0.006	34.91		
Eu	0.11	0.02	0.010	0.20	0.02	0.003	34.48	0.285	
Gd	0.50	0.07	0.032	0.82	0.04	0.012	37.06	0.321	
Dy	0.72	0.10	0.024	1.15	0.07	0.009	36.11	0.385	
Y	4.10	0.56	0.011	6.19	0.22	0.003	38.38	0.401	
Er	0.44	0.04	0.019	0.72	0.03	0.007	37.59	0.424	
Yb	0.43	0.07	0.030	0.73	0.03	0.011	40.08	0.439	
Lu	0.06	0.01	0.005	0.11	0.01	0.002	37.84	0.441	
V	236	15.5	0.051	316	11.9	0.030	39.24	2.01	
Ni	163	9.1	0.189	172	7.3	0.058	38.46		
Cr	3218	948	0.058	768	38	0.033	40.09	2.75	

Data measured on 100 µm thick polished sections by LA-ICP-MS consisting of a Microlas Geolas 200Q 193nm ArF excimer laser system and Micromass Platform quadrupole ICP-MS (Mason & Kraan, 2002)) using a pulse repetition rate of 10 Hz, energy density of 12 J/cm2 and ~60 µm crater diameter. A gas blank (background) was measured for at least 1 min. before each sample analysis. Calibration was performed against the silicate glass reference material NIST SRM 612 using the normalizing coefficients of Pearce et al. (1997) with Ca as an internal standard (CaO = 22 wt%). Detection limit (d.l.) and limit of quantitation were calculated as 3 and 10 sigma on variation in the background signal respectively. Solid/melt partition coefficients for clinopyroxene used in the modelling of the equilibrium melt composition are based on those of Hauri (1994), except for Rb which is based on McKenzie & O’Nions (1991). Values for trivalent rare earth elements were adjusted using a lattice strain model (see figure caption for details).
‡Data for Th, U and/or Nb were below detection limit in this sample. In a few runs, measured values were above detection limit but below limit of quantitation, and these values are plotted in the figures.