metasomatism definition

  • noun:
    • The process in which the chemical composition of a rock is changed by interaction with liquids; replacement of one mineral by another without melting.
    • the process wherein the bulk substance composition of a rock is altered because of the introduction of components from an external source, specifically by a hydrothermal fluid
    • An alteration in a mineral or rock mass when involving a chemical modification of compound, at the time of chrysolite to serpentine; -- against ordinary metamorphism, as implying just a recrystallization.
    • identical to metasomatosis.
    • substance change occurring in a body of ore or perhaps in a rock-mass at a considerable level within the planet's crust: distinguished from weathering, which occurs at or nearby the surface.

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