Pneumatolysis is an obsolete geologic term for magma emitting gasses that alter surrounding rock or crystallize minerals. Pneumatolysis is now considered a type of hydrothermal interaction.
See also Metasomatism
References
Further reading Philip Lake and R. H. Rastall. A textbook of geology (1920). 3rd ed. Edward Arnold: London. pp. 251–255 describes pneumatolysis, especially in granites. McGraw-Hill Encyclopedia of the Geological Sciences. Second edition. New York: McGraw-Hill, 1987. p. 518
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