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- Shun-ichiro Karato
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455
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- Patrick Wu
- Department of Geology and Geophysics, University of Calgary, Calgary, Alberta, Canada T2N 1N4
書誌事項
- 公開日
- 1993-05-07
- DOI
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- 10.1126/science.260.5109.771
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:p>Rheological properties of the upper mantle of the Earth play an important role in the dynamics of the lithosphere and asthenosphere. However, such fundamental issues as the dominant mechanisms of flow have not been well resolved. A synthesis of laboratory studies and geophysical and geological observations shows that transitions between diffusion and dislocation creep likely occur in the Earth's upper mantle. The hot and shallow upper mantle flows by dislocation creep, whereas cold and shallow or deep upper mantle may flow by diffusion creep. When the stress increases, grain size is reduced and the upper mantle near the transition between these two regimes is weakened. Consequently, deformation is localized and the upper mantle is decoupled mechanically near these depths.</jats:p>
収録刊行物
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- Science
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Science 260 (5109), 771-778, 1993-05-07
American Association for the Advancement of Science (AAAS)