Abstract
Metastable melting and high temperature disequilibrium reaction mechanisms are important processes in pyrometamorphism. Because of kinetic factors such as low diffusion rates, low fluid pressure and short-term heating, reaction textures in pyrometamorphic rocks do not generally achieve thermodynamic equilibrium and disequilibrium mineral assemblages arrested in various stages of up-temperature reaction are typically preserved. It is only with a coarsening of grain size during annealing at high temperatures, that thermodynamic equilibrium is approached during pyrometamorphism. Using light optics, the initial stages of mineral reactions can rarely be resolved because they occur over very small distances and the reaction products are typically extremely fine grained.
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Grapes, R. (2010). Metastable Mineral Reactions. In: Pyrometamorphism. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-15588-8_7
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