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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
[met-uh-soh-muh-toh-sis] /ˌmɛt əˌsoʊ məˈtoʊ sɪs/ (Show IPA)
Origin of metasomatism
First recorded in 1885-90; meta- + somat- + -ism
Related forms
metasomatic [met-uh-soh-mat-ik] /ˌmɛt ə soʊˈmæt ɪk/ (Show IPA), adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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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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