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Metamorphic reaction rate laws and development of isograds

Published online by Cambridge University Press:  05 July 2018

Antonio C. Lasaga
Antonio C. Lasaga*
Affiliation:
Yale University, Department of Geology and Geophysics, New Haven, Connecticut 06511, USA
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Abstract

New data on the kinetics of dehydration of muscovite + quartz suggest the necessity for a careful treatment of both surface kinetics and diffusion processes in metamorphic reactions. A new model is proposed that illustrates the relative role of diffusion and surface reactions in the overall metamorphic process. The rate law for the reaction at mineral surfaces derived from the experimental data is shown to be probably non-linear and similar to rate laws derived from Monte Carlo calculations. The experimental rate data is then used in a heat flow calculation to model the evolution of the muscovite isograd in the field. The position of the isograd, the temperature oversteps above equilibrium, and the width of ‘reaction zones’ are then analysed as a function of intrusion size and kinetic parameters.

Keywords

metamorphic reactionssurface kineticsdiffusionrate laws
Type
Rates of Metamorphic Reactions
Information
Mineralogical Magazine , Volume 50 , Issue 357 , September 1986 , pp. 359 - 373
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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