Final answer:
Hydrothermal metamorphism is common in subduction zones, where one tectonic plate is forced beneath another. The high pressure and temperature in these regions cause the subducted plate to undergo metamorphic changes, resulting in the formation of hydrothermal fluids and mineral and chemical changes in the surrounding rocks.
Step-by-step explanation:
Hydrothermal metamorphism is commonly found in subduction zones. Subduction zones are the areas where one tectonic plate is forced beneath another.
As the subducted plate descends into regions of high pressure and temperature, it undergoes metamorphism due to the heat and pressure. This process leads to the formation of hydrothermal fluids, which interact with the surrounding rocks, causing mineral and chemical changes.