Two-Dimensional Convection With a Two-Phase Damage Rheology Lithosphere

Details Two-Dimensional Convection With a Two-Phase Damage Rheology Lithosphere Two-Dimensional Convection With a Two-Phase Damage Rheology Lithosphere

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.t41c1314l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #T41C-1314

Other

8120 Dynamics Of Lithosphere And Mantle: General (1213), 8149 Planetary Tectonics (5475), 8150 Plate Boundary: General (3040), 8159 Rheology: Crust And Lithosphere (8031)

Scientific paper

Plate tectonics is the unifying theory of geology, yet much remains to be understood about its development on Earth and absence on other planets. The generation of plate tectonics from mantle convection requires shear localization in order to form narrow, weak zones that separate the broad, strong plate interiors. Two-phase damage theory provides a theoretical framework to describe the failure and weakening that leads to shear localization. Two-phase damage theory allows for the development of damage to be manifested in two distinct ways: void generation associated with dilation of the matrix and increasing the fineness of the mixture (e.g. pulverization). This work will examine the application of two-phase damage theory to the problem of generating plate-like behavior from mantle convection. Our model will consist of a thin plate obeying a two-phase damage rheology overlaying a Newtonian mantle that is undergoing simple thermal convection in two dimensions. Our objective is to determine how successful the different manifestations of damage are at producing plate-like behavior in a more sophisticated simulation than previously examined. Time-dependent calculations were performed in a systematic investigation of parameter space to determine the regimes in which two-phase damage theory was able to generate plate-like behavior. Our results suggest that damage manifested as increasing the fineness of the mixture generates better plate tectonic behavior than damage manifested as dilation of the matrix.

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