The interaction of viscous heating with grain-size dependent rheology in the formation of localized slip zones

Details The interaction of viscous heating with grain-size dependent rheology in the formation of localized slip zones The interaction of viscous heating with grain-size dependent rheology in the formation of localized slip zones

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2523k&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 20, p. 2523-2526

Physics

28

Seismology: Earthquake Dynamics And Mechanics, Structural Geology: Fractures And Faults, Tectonophysics: Dynamics, Seismotectonics

Scientific paper

The formation of localized shear zones is important for understanding many local and global processes in geodynamics. We have developed a self-consistent thermal-mechanical model together with a rheology which depends on temperature, strain-rate and grain-size distribution. The grain-size distribution has contributions from both dynamic recrystallization and grain-growth processes, and is governed locally by a nonlinear ordinary differential equation. A one-dimensional model with 104 points is employed to resolve all of the scales involving grain-size and temperature. We found that grain-growth inhibits the development of shear zones, and that there is a delicate interplay between viscous heating and grain-growth process in determining whether narrow fault zones are developed quickly. For realistic parameters of rheology and grain-boundary processes for wet olivine, the magnitude of the rate of grain-growth is crucial to determine whether shear zones are stable or unstable at temperature T~=1000K or shear stress σ~=100MPa.

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