Hornfels facies rocks form in shallow crustal environments due to contact (thermal)metamorphism.As a result,hornfels typically
A) are foliated.
B) form at high pressures and low temperatures.
C) form at low pressures and high temperatures.
D) are associated with deep sedimentary basins.

Question

Quizplus · Accepted Answer

Hornfels facies rocks form due to contact metamorphism, which occurs in shallow crustal environments where there is high temperature and low pressure. Therefore, option C, which states that hornfels form at low pressures and high temperatures is the best choice.

Hornfels Facies Rocks Form in Shallow Crustal Environments Due to Contact