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Rock alteration or mineral crystallization effected by gaseous emanations from solidifying magma.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



mineral formation by the action on the country rock of volatile compounds released from magma, chiefly superheated water vapor; of compounds of B, P, S, and As; and of the fluorides and chlorides of tin, tungsten, beryllium, and lithium. Pneumatolysis is generally most evident in strata that enclose acidic intrusions (granites). Sometimes it is evident in strata that enclose alkali and basic intrusions, as well as in pegmatites, contact-metasomatic formations, and areas of volcanic eruptions. With the plutonic recrystallization of these formations, a group of pneumatolytic mineral deposits is formed as a consequence of pneumatolysis.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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