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Fluids In Metamorphism, June 2010, Vol. 6, No. 3
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Fluids play a critical role during metamorphic processes. They have first-order influence on both reaction kinetics and mass transfer, and thus also on the rate of metamorphism.
Fluids In Metamorphism
June 2010, Vol. 6, No. 3
Fluids play a critical role during metamorphic processes. They have first-order influence on both reaction kinetics and mass transfer, and thus also on the rate of metamorphism. “Volatile components,” such as H2O and CO2, may strongly influence rock rheology even in the absence of a free fluid phase. Metamorphic fluids therefore control the coupling between chemical reactions, mass transport, and deformation. Microstructures, compositional gradients at various scales, and larger-scale deformation features all reflect the dynamics of fluid–rock interactions. Moreover, the migration of fluids produced during prograde metamorphic processes or consumed during retrogression links metamorphism with the hydrosphere, the atmosphere, and the biosphere. This issue sheds light on the origin of the various patterns that emerge in metamorphic rocks as a response to changes in pressure, temperature, and the composition of pore-filling fluid. By following the metamorphic fluids to or from the Earth’s surface, we also aim to explain how metamorphism may affect our own environment.
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