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Modelling of the relations between reaction enthalpy and the buffering of reaction progress in metamorphism

Published online by Cambridge University Press:  05 July 2018

John Ridley
John Ridley*
Affiliation:
Institut für Mineralogie und Petrographie, ETH-Zentrum, CH-8092, Zürich, Switzerland
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Abstract

A proportion of the heat added to a body of rock during prograde metamorphism will be absorbed in the chemical work of metamorphic recrystallization. When and where heat is so absorbed will affect the exact thermal histories of the rocks, and hence the metamorphic textures. This paper reports the results of modelling of the inter-relations between reaction progress and thermal histories in a rock column. The results suggest that volumes of rock undergoing reaction at any moment act as heat sinks and absorb heat from the surrounding rock, that reaction generally takes place close to the temperature at which nucleation took place, and that steady heating of a rock pile can give rise to a reaction history in which spurts of reaction are separated by ‘quiet’, non-reactive intervals.

Keywords

prograde metamorphismkineticsheat flowreaction enthalpy
Type
Rates of Metamorphic Reactions
Information
Mineralogical Magazine , Volume 50 , Issue 357 , September 1986 , pp. 375 - 384
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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Footnotes

*

Present address: Department of Geology, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe.

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