Supplementary Information



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Supplementary figure 1. Isobaric melting curves with different bulk water contents and for different melting regimes. Bulk distribution coefficient of water is assumed to be 0.01. The sharp increase in melt productivity just above the solidus for the 0.3 wt% melting curve is due to the high water content that exceeds saturation in the melt. The discontinuity in melt productivity at high degrees of melting is due to cpx exhaustion. We assumed a modal cpx concentration of 17% in the unmelted solid. a. Batch melting; b. near-fractional with a residual porosity  = 1%; and c. pure-fractional at pressures of 1 GPa. d. Batch melting; e. near-fractional with a residual porosity  = 1%; and f. pure-fractional at pressures of 2 GPa. Note, when hydrous melting is included, melting regime affects significantly melt productivity. Compare our results with those shown in Fig. 4 of ref. 9 and Fig. 2 of ref. 12.


Supplementary figure 2. REE patterns, from two different along axis locations, for the near-fractional melting model shown in figure 3 with different residual porosities. Solid lines connecting small diamonds are partial aggregated melts predicted for vertical increments dz = 5 km. The thick solid red lines connecting big orange diamonds are the mean compositions after complete mixing. a. Pure fractional (= 0 %); b. near-fractional (= 0.25 %) and c. near-fractional (= 1%) at 82 km from RTI. d. Pure fractional (= 0%); e. near-fractional (= 0.25 %) and f. near-fractional (= 1 %) at 44 km from RTI. Yellow square brackets indicate REE patterns from melt generated in the garnet stability field.

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