autopneumatolysis

autopneumatolysis

[¦ȯd·ō‚nü·mə′täl·ə·səs]
(geology)
The occurrence of metamorphic changes at the pneumatolytic stage of a cooling magma when temperatures are approximately 400-600°C.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.