Metasomatic

Choose the most appropriate definition for this term:

1	Describes metamorphism in which the dominant processes involve deformation and recrystallisation rather than temperature change.
2	Describes mixed rocks, partly metamorphic and partly igneous in appearance, and commonly formed by partial melting.
3	Describes a metamorphic process involving mass transfer and change of bulk chemical composition.
4	Describes rocks formed by the metamorphism of sandstones (e.g. the Moine rocks of NW Scotland).

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