Low Core-Mantle Boundary Temperature Inferred from the Solidus of Pyrolite
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- Ryuichi Nomura
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
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- Kei Hirose
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
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- Kentaro Uesugi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan.
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- Yasuo Ohishi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan.
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- Akira Tsuchiyama
- Division of Earth and Planetary Sciences, Kyoto University, Kyoto, Kyoto 606-8502, Japan.
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- Akira Miyake
- Division of Earth and Planetary Sciences, Kyoto University, Kyoto, Kyoto 606-8502, Japan.
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- Yuichiro Ueno
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
書誌事項
- 公開日
- 2014-01-31
- 資源種別
- journal article
- DOI
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- 10.1126/science.1248186
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:title>Melting Moments</jats:title> <jats:p> The boundary between Earth's core and mantle defines where the iron-rich liquid outer core meets the more chemically heterogeneous solid lower mantle and is marked by a sharp thermal gradient of nearly 1500 kelvin. The precise relationship between temperature and melting of the lowermost mantle constrains the structure and heat flow across the core-mantle boundary. In order to identify trace amounts of liquid as melting initiates, <jats:bold> Nomura <jats:italic>et al</jats:italic> . </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6170" page="522" related-article-type="in-this-issue" vol="343" xlink:href="10.1126/science.1248186">522</jats:related-article> , published online 16 January) performed x-ray microtomographic imaging of rocks of a primitive mantle composition that had been subjected to high pressures and temperatures in a diamond anvil cell. The experimentally determined maximum melting point of 3570 kelvin suggests that some phases typically thought to lose stability in the lowermost mantle, such as MgSiO <jats:sub>3</jats:sub> -rich post-perovskite, may be more widely distributed than expected. </jats:p>
収録刊行物
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- Science
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Science 343 (6170), 522-525, 2014-01-31
American Association for the Advancement of Science (AAAS)