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- Edward J. Garnero
- School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287, USA.
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- Allen K. McNamara
- School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287, USA.
書誌事項
- 公開日
- 2008-05-02
- DOI
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- 10.1126/science.1148028
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:p>Processes within the lowest several hundred kilometers of Earth's rocky mantle play a critical role in the evolution of the planet. Understanding Earth's lower mantle requires putting recent seismic and mineral physics discoveries into a self-consistent, geodynamically feasible context. Two nearly antipodal large low-shear-velocity provinces in the deep mantle likely represent chemically distinct and denser material. High-resolution seismological studies have revealed laterally varying seismic velocity discontinuities in the deepest few hundred kilometers, consistent with a phase transition from perovskite to post-perovskite. In the deepest tens of kilometers of the mantle, isolated pockets of ultralow seismic velocities may denote Earth's deepest magma chamber.</jats:p>
収録刊行物
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- Science
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Science 320 (5876), 626-628, 2008-05-02
American Association for the Advancement of Science (AAAS)
