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

metasomatic [met-uh-soh-mat-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
metasomatism or metasomatosis (ˌmɛtəˈsəʊməˌtɪzəm, ˌmɛtəˌsəʊməˈtəʊsɪs)
change in the composition of a rock or mineral by the addition or replacement of chemicals
[C19: from New Latin; see meta-, somato-]
metasomatosis or metasomatosis
[C19: from New Latin; see meta-, somato-]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
metasomatism (mět'ə-sō'mə-tĭz'əm) also metasomatosis   (mět'ə-sō'mə-tĭz'əm)  Pronunciation Key 
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
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