Question

What is a metamorphic facies?

a. a group of metamorphic rocks that are all the same age
b. a group of metamorphic rocks that contain the same assemblage of minerals
c. a group of metamorphic rocks that all have the exact same texture
d. a group of metamorphic rocks that all form in a single region of the world
e. a group of metamorphic rocks that all formed form the same type of parent rock

Answer 1

A metamorphic facies is a set of metamorphic rocks characterized by a similar mineral assemblage formed under similar pressure and temperature conditions during the process of metamorphism.

Step-by-step explanation:

A metamorphic facies refers to a set of metamorphic rocks that can be recognized by a distinctive assembly of mineral types that formed under similar pressures and temperatures. These facies are a result of the metamorphism process, where the minerals and textures of a rock transform due to conditions such as heat, pressure, or chemically reactive fluids.

Every metamorphic facies has a distinct set of characteristics, which are not necessarily linked to a specific age, texture, region, or parent rock type alone. Instead, the term facies relates primarily to the mineral composition and the metamorphic environment under which the rock was formed.