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Related to metasomatosis: contact metasomatism


 (mĕt′ə-sō′mə-tĭz′əm) also met·a·so·ma·to·sis (-sō′mə-tō′sĭs)
The process by which the chemical composition of a rock is changed by interaction with fluids; replacement of one mineral by another without melting.

met′a·so·mat′ic (-măt′ĭk) adj.
met′a·so·mat′i·cal·ly adv.


(ˌmɛtəˈsəʊməˌtɪzəm) or


(Geological Science) change in the composition of a rock or mineral by the addition or replacement of chemicals
[C19: from New Latin; see meta-, somato-]


(ˌmɛt əˈsoʊ məˌtɪz əm)

also met•a•so•ma•to•sis

(-ˌsoʊ məˈtoʊ sɪs)

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.
met`a•so•mat′ic (-ˈmæt ɪk) adj.


the process of chemical change in rocks or other mineral masses that results in the formation of new rocks or minerals. Also metasomatosis.
See also: Geology
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References in periodicals archive ?
The siliceous rocks, in addition to clay rock, clastic and carbonate rocks, are the most widely distributed sedimentary rock in this orogenic belt [3, 19, 92], and their formation is previously attributed to biogenesis [93], metasomatosis (or silicification) [94, 95] or chemical deposition [49, 96].
Grasberg is a rock mass with the characteristics of limestone's, which has undergone transformation (metasomatosis).