HR: 15:00h
AN: T33E-06    [Abstracts]
TI: Two and Three Dimensional Simulations of Thick Skin Continental Deformation : Exploring the Influence of Rheology on Localization Patterns
AU: * Moresi, L
EM: louis.moresi@sci.monash.edu
AF: Monash Cluster Computing, School of Mathematical Sciences Building 28 Monash University, Clayton, VIC 3800 Australia
AU: May, D
EM: david.may@maths.monash.edu.au
AF: Monash Cluster Computing, School of Mathematical Sciences Building 28 Monash University, Clayton, VIC 3800 Australia
AB: We present simple two and three dimensional models of extended and sheared thick-skin models of continental lithosphere. We examine the role of rheological layering, yield model (von Mises v. Mohr-Coulomb), and strain softening model (isotropic / anisotropic) on the pattern of surface deformation and the distribution of deformation with depth around localized zones. We examine the conditions required to develop throughgoing "faults" versus decoupled crust/mantle deformation in the large deformation limit and related the evolution of the deformation planform from the pristine state to the fully evolved state to the thermal/mechanical parameters. Models are run using a Lagrangian Integration Point finite element method which tracks material strain and damage at each material through the entire simulation. A variety of materials of distinct rheology can coexist in the mesh with implicit no-slip boundary conditions between domains composed of each material
DE: 8010 Fractures and faults
DE: 8020 Mechanics
DE: 8120 Dynamics of lithosphere and mantle--general
DE: 8159 Rheology--crust and lithosphere
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting