Many arc lavas show evidence for the involvement of subducted sediment in the 10 melting process. There is debate whether this "sediment melt" signature forms at 11 relatively low temperature near the fluid-saturated solidus or at higher temperature 12 beyond the breakdown of trace-element-rich accessory minerals. We present new 13 The enrichment of these elements, and their correlation with the flux and composition of 30 subducted sediments, has been interpreted to reflect a "sediment melt" signature in arc 31 lavas [2][3][4] . Subduction zone thermal models that incorporate temperature-and stress-32 dependent viscosity 5-8 produce slab-top temperatures above the fluid-saturated sediment 33

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