Figure 1. The crustal fluxes through a subduction zone (after von Huene and Scholl, 1993). Arrows indicate schematic flow, not detailed flow patterns. The return flux of crustal material to the mantle depends on many other fluxes: the partitioning of bulk sediment in the shallow part of the subduction zone (by accretion, underplating, and erosion), the chemical and fluid fluxes due to sediment dehydration and melting, and the chemical fluxes to the volcanic arc and backarc.
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