Which phenomenon increases when volatiles are introduced into a subduction zone mantle wedge?

💡 Explanation

When volatiles (like water) are introduced, flux melting occurs because the addition of water lowers the mantle's melting temperature, triggering partial melting and generating magma. Therefore, magma generation increases, rather than decreased seismic velocity, increased metamorphic rock formation, or greater geothermal gradient stability which rely on different mechanisms.

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