The blueschist facies form under which of these conditions:
A) high temperature and high pressure
B) low temperature and low pressure
C) high temperature but relatively low pressure
D) high pressure but relatively low temperature

Question

Quizplus · Accepted Answer

The blueschist facies form under high pressure but relatively low temperature conditions, typically between 200 and 500 degrees Celsius and 0.5 to 2.5 GPa (gigapascals) of pressure. The pressure conditions may arise due to subduction, where the oceanic crust is forced beneath the continental crust or another section of oceanic crust. The low temperature conditions are due to the relatively cooler temperature of the oceanic crust before it is subducted.

The Blueschist Facies Form Under Which of These Conditions