Where does metamorphism take place? What will be an ideal ...

[burchfield96]

Where does metamorphism take place?
 
  What will be an ideal response?

Question 2

How can geologists tell what the rock was before it was metamorphosed?
 
  What will be an ideal response?

Question 3

How are the conditions of metamorphism determined? Why aren't minerals such as quartz and feldspar helpful in determining the conditions?
 
  What will be an ideal response?

[Viet Thy]

Answer to Question 1

Answer: The three primary types of metamorphism are contact, hydrothermal, and regional. Contact metamorphism occurs along igneous intrusions. It is local metamorphism with reactions driven primarily by heat. Contact metamorphism is most intense closest to the magma and decreases away from the intrusion. Hydrothermal metamorphism on a local scale involves hot fluids, derived from intruding igneous bodies or infiltrating ground water, which circulate through the rock. This type of metamorphism occurs on a large scale at divergent plate boundaries, where large volumes of circulating hot seawater promote metamorphism and ore production. Regional metamorphism depends on temperature and pressure increases that occur over very large volumes of crust and produces extensive tracts of foliated rocks. It typically occurs near convergent plate boundaries.

Answer to Question 2

Props to you, cheers.

Answer to Question 3

Answer: Index minerals reveal metamorphic temperature and pressure because they are stable over limited ranges of temperature, pressure, or both. Other minerals, such as quartz and feldspar, do not indicate metamorphic grade because they are stable over large temperature and pressure ranges.