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dc.contributor.authorMontesi, Laurent G. J.  Concept link
dc.date.accessioned2010-04-28T14:50:42Z
dc.date.available2010-04-28T14:50:42Z
dc.date.issued2007-04-27
dc.identifier.citationGeophysical Research Letters 34 (2007): L08307en_US
dc.identifier.urihttps://hdl.handle.net/1912/3341
dc.descriptionAuthor Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 34 (2007): L08307, doi:10.1029/2007GL029250.en_US
dc.description.abstractThe 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.en_US
dc.description.sponsorshipThis project was supported by NSF grant EAR- 0337678 and the Andrew W. Mellon Foundation Endowed Fund for Innovative Research.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2007GL029250
dc.subjectShear zoneen_US
dc.subjectFoliationen_US
dc.subjectRheologyen_US
dc.titleA constitutive model for layer development in shear zones near the brittle-ductile transitionen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2007GL029250


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