Which crustal deformation occurs due to hydrated mineral formation during oceanic plate subduction?

💡 Explanation

When oceanic lithosphere subducts, hydration of mantle wedge rocks through water released from the subducting slab promotes serpentinization, which decreases density and causes uplift and thrust faulting in the corresponding forearc region. Therefore forearc basin subsidence coupled with compressional features results, not rifts, strike-slip, or shield volcanoes which form via extension or mantle plumes.

• Which geomorphological feature develops when reduced stream gradient promotes vertical alluvial deposition along a floodplain?
• Which phenomenon disrupts coastal upwelling when intensified ocean gyre circulation creates strong downward Ekman transport?
• Which effect accelerates longshore drift when approaching headlands?
• Which mechanism causes long-term cyclic uplift and subsidence along a strike-slip fault zone?
• Which outcome occurs when hydraulic action erodes steep sea stack faces?
• Which outcome develops when sediment supply exceeds transport capacity on a rapidly subsiding basin with proximal mountain uplift forming a braided stream?