Final answer:
Metamorphism at a convergent margin includes Barrovian sequence regional metamorphism during continental collisions and high-pressure, high-temperature metamorphism in subduction zones where oceanic plates subduct beneath other plates.
Step-by-step explanation:
The type of metamorphism that occurs at a convergent margin is largely dependent on the conditions of temperature and pressure specific to that setting.
During a continental collision, the Barrovian sequence is observed where a 'mirror image' gradient of metamorphic rocks forms, with low-grade metamorphic rocks occurring further away from the collision center and higher up in the crust, while high-grade metamorphic rocks are found closer to the center and deeper down. Over time, erosion and uplift expose these high-grade rocks. At subduction zones, where an oceanic plate subducts beneath a continental or another oceanic plate, the plate is subjected to high pressure and temperature, leading to regional metamorphism. Subducted material may eventually melt and contribute to magmatic processes several hundred kilometers below the surface.