Question

Difference between prograde and retrograde metamorphism

Answer 1

Metamorphism is further divided intoprograde and retrograde metamorphism.Prograde metamorphism involves the change of mineral assemblages (paragenesis) with increasing temperature and (usually) pressure conditions. ...Metamorphic rocks usually do not undergo further change when they are brought back to the surface.

Answer 2

Answer:

PROGRADE METAMORPHISM

Temperature and pressure are increased

Water molecules from minerals are usually squeezed out, forming “drier” rocks.

RETROGRADE METAMORPHISM

Temperature and pressure decreased

Requires the addition of hydrothermal fluids or water.

Rocks are usually brought back to the surface.