Final answer:
Blueschist is formed through the tectonic process of metamorphism within subduction zones, where one tectonic plate is forced beneath another.
Step-by-step explanation:
The tectonic process implied by blueschist is metamorphism.
Blueschist is a type of metamorphic rock that forms under high pressures and low temperatures. It is typically associated with subduction zones, where one tectonic plate is forced beneath another.
During subduction, the oceanic plate is subjected to intense pressure and low temperatures, causing the minerals within the rock to undergo changes, resulting in the formation of blueschist.