Which outcome results from crustal flow obstruction during subduction?

💡 Explanation

An accretionary wedge forms due to sediment and crustal material scraping off the subducting plate and accumulating, because crustal flow is obstructed; this creates a build-up of material scraped from the subducting plate, therefore forming an accretionary wedge rather than other outcomes associated with mantle dynamics.

• Which mechanism causes regional metamorphism of sedimentary rocks along a subduction zone?
• Which outcome primarily results when tectonic subsidence forms a deep lake basin in a humid region?
• Which outcome occurs when intense weathering follows glacial retreat?
• Which outcome occurs when strain exceeds creep strength?
• Which mechanism initiates downwelling when surface water density substantially increases in polar marine regions?
• Which mechanism interrupts thermohaline circulation when glacial ice melt increases significantly?