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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(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-]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


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
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
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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.
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)).