hornfels facies
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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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