The compositional properties of garnet probably preserve the most extensive records of the pressure-temperature-time (P-T-t) history of metamorphic rocks. There are a number of cation-exchange and discontinuous reactions involving garnet that have been extensively used to decipher the P-T conditions or P-T paths of the host rocks as these were buried and exhumed (e.g., Ganguly and Saxena 1987; Spear 1993). However, as metamorphic garnets commonly show compositional zoning, the choice of composition within a zoned garnet to retrieve peak metamorphic conditions requires consideration of its diffusion kinetic properties...

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