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Fig. 7

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(a) No initial serpentinization of the slab: reduction in mantle hydration and disappearance of the second melting zone. (b) Zones A and B both show oceanic plate melting, but triggered by different processes (see Sect. 3.2). Zones I, II, III refer to Section 4.2.2. (c) The extent of hydration zone depends on the velocity of the overriding plate. See the legend Figure 6.

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