hornfels facies


hornfels facies

[′hȯr‚felz ¦fā·shēz] (petrology) Rock formed at depths in the earth's crust not exceeding 6.2 miles (10 kilometers) at temperatures of 250-800°C; includes albite-epidote hornfels facies, pyroxene-hornfels facies, and hornblende-hornfels facies.