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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.
(def 4).
change in the composition of a rock or mineral by the addition or replacement of chemicals
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.


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