Final answer:
High pressure, low temperature metamorphism typically occurs during continental collisions, where recrystallization happens under subsolidus conditions, and high-grade rocks are exposed by erosion.
Step-by-step explanation:
High pressure, low temperature metamorphism is likely to occur in settings where a significant amount of tectonic activity is present, such as during a continental collision. These conditions facilitate the transformation of existing rocks into metamorphic rocks without melting them, which is a process known as recrystallization under subsolidus conditions. In particular, the Barrovian sequence demonstrates the association of increasing pressure and temperature with increasing depth towards the center of the collision, and the subsequent exposure of these high-grade metamorphic rocks at the surface is often due to erosion.