Which mechanism amplifies magma production beneath island arc volcanoes during subduction?

💡 Explanation

When a subducting oceanic plate descends, flux melting occurs because water released from hydrated minerals lowers the mantle's melting point, thus generating more magma. Therefore, flux melting increases magma production at island arcs, rather than plume upwelling, decompression, or viscous heating, which operate in different tectonic settings.

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