Which mechanism causes volcanic arc formation parallel to a subduction zone when a slab hydrates mantle?

💡 Explanation

When a subducting slab hydrates mantle peridotite, flux melting occurs because water lowers the mantle's melting point, generating magma that rises to forming a volcanic arc. Therefore lowered solidus results, rather than decompression or shear heating which require different geodynamic settings.

• Following a subduction event, which risk increases because of crustal deformation?
• Which resulting ground feature indicates intense solifluction due to thawing permafrost on gentle alpine slopes?
• Which mechanism explains localized crustal uplift preceding major earthquakes near subduction zones?
• Which erosional pattern emerges when acidic groundwater percolation weakens cave structures?
• Which crustal deformation occurs when a subducting oceanic plate's asperities overcome resistance along the plate interface?
• Which geographic alteration results when large magma volumes load Earth's crust, creating isostatic depression?