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[met-uh-soh-muh-tiz-uh m] /ˌmɛt əˈsoʊ məˌtɪz əm/
noun, Geology
the series of metamorphic processes whereby chemical changes occur in minerals or rocks as a result of the introduction of material, often in hot aqueous solutions, from external sources.
replacement (def 4).
Also, metasomatosis.
1885-90; meta- + somat- + -ism
Related forms
[met-uh-soh-mat-ik] /ˌmɛt ə soʊˈmæt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for metasomatism
  • The breccias are intensively altered by hydrothermal-metasomatism with a well-defined definite mineralogical zoning.
British Dictionary definitions for metasomatism


change in the composition of a rock or mineral by the addition or replacement of chemicals
Word Origin
C19: from New Latin; see meta-, somato-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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metasomatism in Science
metasomatism (mět'ə-sō'mə-tĭz'əm) also metasomatosis
The process by which the chemical composition of a rock is changed through the introduction or extraction of chemicals dissolved in fluids that migrate through the rock's pores. Metasomatism often results in the formation of new minerals, especially metal ore deposits.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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