Self‐consistent generation of tectonic plates in time‐dependent, three‐dimensional mantle convection simulations
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- Paul J. Tackley
- Department of Earth and Space Sciences University of California Los Angeles USA
書誌事項
- 公開日
- 2000-08
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2000gc000036
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>Presented here are self‐consistent, three‐dimensional simulations of mantle convection, some of which display an approximation of plate tectonic behavior that is continuous in space and time. Plate behavior arises through a reasonable material description of silicate deformation, with a simple yield stress being sufficient to give first‐order plate‐like behavior; however, the required yield strength or fault frictional coefficient is much less than experimentally determined values. Toroidal:poloidal ratios are within geologically observed limits. The sensitivity of the system to yield strength and the form of strength envelope is systematically investigated. Optimum plate character is obtained in a narrow range of yield strength, below which diffuse boundaries, and above which episodic behavior, and eventually a rigid lid, are observed. Models with mobile lids develop very long wavelength horizontal structure, the longest wavelength possible in the domain. Two‐dimensional models display much greater time dependence than three‐dimensional models.</jats:p>
収録刊行物
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- Geochemistry, Geophysics, Geosystems
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Geochemistry, Geophysics, Geosystems 1 (8), 2000GC000036-, 2000-08
American Geophysical Union (AGU)
