Where Does Prograde Metamorphism Occur?

In general, the changes in mineral assemblage and mineral composition that occur during burial and heating are referred to as prograde metamorphism, whereas those that occur during uplift and cooling of a rock represent retrograde metamorphism.

What rocks occur in prograde metamorphism?

Prograde metamorphism of quartzofeldspathic rocks into the eclogite facies is predicted to involve breakdown of plagioclase to denser Na- and Ca-bearing phases, and the replacement of the sheet silicates biotite and chlorite by phengitic white mica and sometimes talc.

What is prograde metamorphism?

Prograde metamorphism involves the change of mineral assemblages (paragenesis) with increasing temperature and (usually) pressure conditions. These are solid state dehydration reactions, and involve the loss of volatiles such as water or carbon dioxide.