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Related to metasomatised: Metasomatic Rocks, Altered igneous rock


 (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 ?
presents new data on stable isotopes from albite, scapolite, amphibole, quartz, and calcite mineral separates from metasomatised rocks in the Bamble lithotectonic domain, southeast Norway.
As a result, the most primitive gabbros have been interpreted as derived from melting of a heterogeneous subcontinental lithospheric mantle, metasomatised via crustal recycling (Orejana et al., 2009).
According to Petterson and Windley (1991) the typical mantle is the source region for stage-2 pluton which was metasomatised by subduction related processes.
The fact that the staurolite metabasites occur very closely associated with pelitic and calc-silicate rocks, makes the hypothesis of metamorphism of metasomatised layers at the origin of these metabasites more likely than considering the staurolite-hornblende paragenesis as a result of unusual physical conditions.
Material from a range of sources was present, including metasomatised argillite, chert, greywacke, obsidian, orthoquartzite and nephrite.
For most of the metasomatised samples analysed, there is a negative correlation between Ti[O.sub.2] and [Fe.sub.2][O.sub.3], while for the gabbro an overall positive correlation between these two oxides exists (Figure 5(k)).