In these Subduction zones theirs most likely to be Continental vovolcanic arc. What these volcanos are just volcanos next two continental plates. An example of these volcanos is in the ring of fire. In the other hand an volcanic island arc is bassically the same thing above a subducting zone and it'll continue like in the ring of fire.
Convergent Boundaries
Convergent Boundaries is when to plates are going towards each other, an example of convergent boundaries is the North American an Eurasian plates at the Mid-Atlantic Ridge. When a continental plate and a oceanic plate collide since the continental crust is thicker than the oceanic crust it submerges and goes underneath it creating a trench and a subduction