The analogue shear zone : from rheology to associated geometry
Schrank, Christoph E., Boutelier, David A. , & Cruden, Alexander R. (2008) The analogue shear zone : from rheology to associated geometry. Journal of Structural Geology, 30(2), pp. 177-193.
The geometry of ductile strain localization phenomena is related to the rheology of the deformed rocks. Both qualitative and quantitative rheological properties of natural rocks have been estimated from finite field structures such as folds and shear zones. We apply physical modelling to investigate the relationship between rheology and the temporal evolution of the width and transversal strain distribution in shear zones, both of which have been used previously as rheological proxies. Geologically relevant materials with well-characterized rheological properties (Newtonian, strain hardening, strain softening, Mohr-Coulomb) are deformed in a shear box and observed with Particle Imaging Velocimetry (PIV). It is shown that the width and strain distribution histories in model shear zones display characteristic finite responses related to material properties as predicted by previous studies. Application of the results to natural shear zones in the field is discussed. An investigation of the impact of 3D boundary conditions in the experiments demonstrates that quantitative methods for estimating rheology from finite natural structures must take these into account carefully.
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|Item Type:||Journal Article|
|Keywords:||Physical modelling, Analogue modelling, Shear zones, Rheology, Strain distribution|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Structural Geology (040312)|
|Divisions:||Current > Schools > School of Earth, Environmental & Biological Sciences|
Past > Institutes > Institute for Sustainable Resources
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||29 Nov 2012 13:14|
|Last Modified:||07 Jun 2013 07:09|
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