permeation gneiss

permeation gneiss

[‚pər·mē′ā·shən ¦nīs]
(petrology)
A gneiss formed as a result of or modified by the passage of geochemically mobile materials through or into solid rock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.