Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3408307m&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 8, CiteID L08307
Physics
4
Mineralogy And Petrology: Petrography, Microstructures, And Textures, Physical Properties Of Rocks: Fracture And Flow, Structural Geology: High Strain Deformation Zones, Structural Geology: Mechanics, Theory, And Modeling, Tectonophysics: Rheology: Crust And Lithosphere (8031)
Scientific paper
The microstructure of ductile shear zones differs from that of surrounding wall rocks. In particular, compositional layering is a hallmark of shear zones. As layered rocks are weaker than their isotropic protolith when loaded in simple shear, layering may hold the key to explain localization of ductile deformation onto ductile shear zones. I propose here a constitutive model for layer development. A two-level mixing theory allows the strength of the aggregate to be estimated at intermediate degrees of layering. A probabilistic failure model is introduced to control how layers develop in a deforming aggregate. This model captures one of the initial mechanism of phase interconnection identified experimentally by Holyoke and Tullis (2006a, 2006b), fracturing of load bearing grains. This model reproduces the strength evolution of these experiments and can now be applied to tectonic modeling.
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