Where on earth do we often find examples of metamorphism due to chemically active
fluids?

Metamorphism occurs at temperatures and pressures higher than 200oC and 300 MPa. Rocks can be subjected to these higher temperatures and pressures as they are buried deeper in the Earth. Such burial usually takes place as a result of tectonic processes such as continental collisions or subduction

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;