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granitization
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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granitization

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granitization, formation of granite or closely related rocks by metamorphic processes, as opposed to igneous processes in which such rocks form from a melt, or magma, of granitic composition. In granitization, sediments are transformed in their solid state or in a partially molten state. The solid-state process requires the addition and removal of various chemical components by solid-state diffusion, vapour transport, or the movement of certain fluids such as aqueous solutions.

Granitization may occur on a small, localized scale, as in the formation of migmatite in which igneous rocks of granitic composition are intermixed with high-grade metamorphic rocks.

This article was most recently revised and updated by John P. Rafferty.