交代变质作用; 交代作用
Metasomatism \Met`a*so"ma*tism\, n. [Pref. meta- + Gr. ?, ?, body.] (Geol.) 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.