Mineral assemblages within metamorphic rock are
A)always identical to that found within its protolith.
B)dependent only on the mineral assemblage of its protolith.
C)dependent only on the temperature and pressure of formation.
D)dependent on both the mineral content of its protolith and the temperature and pressure of formation.

Question

Quizplus · Accepted Answer

The mineral assemblages within metamorphic rock are dependent on both the mineral content of its protolith and the temperature and pressure of formation. Different protoliths can have different mineral compositions, which will affect the mineral assemblage of the resulting metamorphic rock. Additionally, the temperature and pressure conditions during metamorphism can also alter the mineral assemblage. Therefore, the mineral assemblage of a metamorphic rock can be influenced by both its protolith and the conditions of its formation.

Mineral Assemblages Within Metamorphic Rock Are