Deformation with coupled chemical diffusion

Regenauer-Lieb, Klaus, Hobbs, Bruce, Ord, Alison, Gaede, Oliver, & Vernon, Ron (2009) Deformation with coupled chemical diffusion. Physics of the Earth and Planetary Interiors, 172(1-2), pp. 43-54.

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Abstract

The deformation of rocks is commonly intimately associated with metamorphic reactions. This paper is a step towards understanding the behaviour of fully coupled, deforming, chemically reacting systems by considering a simple example of the problem comprising a single layer system with elastic-power law viscous constitutive behaviour where the deformation is controlled by the diffusion of a single chemical component that is produced during a metamorphic reaction. Analysis of the problem using the principles of non-equilibrium thermodynamics allows the energy dissipated by the chemical reaction-diffusion processes to be coupled with the energy dissipated during deformation of the layers. This leads to strain-rate softening behaviour and the resultant development of localised deformation which in turn nucleates buckles in the layer. All such diffusion processes, in leading to Herring-Nabarro, Coble or “pressure solution” behaviour, are capable of producing mechanical weakening through the development of a “chemical viscosity”, with the potential for instability in the deformation. For geologically realistic strain rates these chemical feed-back instabilities occur at the centimetre to micron scales, and so produce structures at these scales, as opposed to thermal feed-back instabilities that become important at the 100–1000 m scales.

Impact and interest:

16 citations in Scopus
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12 citations in Web of Science®

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ID Code: 60074
Item Type: Journal Article
Refereed: Yes
Keywords: Non-equilibrium thermodynamics, Deformation and diffusion, Folding and diffusion, Coupled chemical-deformation systems
DOI: 10.1016/j.pepi.2008.08.013
ISSN: 0031-9201
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CLASSICAL PHYSICS (020300) > Thermodynamics and Statistical Physics (020304)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Structural Geology (040312)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOPHYSICS (040400) > Geodynamics (040402)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 19 May 2013 23:11
Last Modified: 23 Jul 2013 04:14

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