METASOMATISM

Noun

metasomatism (countable and uncountable, plural metasomatisms)

(geology) The process by which the bulk chemical composition of a rock is changed by the introduction of components from an external source, especially by a hydrothermal fluid.

Source: Wiktionary

Met`a*so"ma*tism, n. Etym: [Pref. meta- + Gr. (Geol.)

Definition: An alteration in a mineral or rock mass when involving a chemical change of the substance, as of chrysolite to serpentine; -- opposed to ordinary metamorphism, as implying simply a recrystallization.

– Met`a*so*mat"ic, a.

Source: Webster’s Unabridged Dictionary 1913 Edition

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