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Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
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上層マントルの熱拡散性のアニソトロピー
A Tommasi1, B Gibert, U Seipold
1Laboratoire de Tectonophysique, CNRS/Université de Montpellier II, France. deia@dstu.univ-montp2.fr
Nature
|July 19, 2001
まとめ
上層マントル岩の変形は熱アニソトロピーを生み出し,流動方向に沿って熱の移転を高速にします. このストレンス誘発のアニソトロピーは,地球の動力学に影響を与え,温度分布とレオロギーを影響します.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- ミネラル物理学 ミネラル物理学
- 固体地球科学 固体地球科学
背景:
- 地球のマントルの熱伝達は,惑星の動力学にとって極めて重要です.
- オリヴィンは熱的アニソトロピーを示し,地震データは上層マントルの大規模なオリヴィン方向性を明らかにしています.
- マントルミネラルの高温における熱アニソトロピーとその変形との関連は,まだ十分に理解されていない.
研究 の 目的:
- 高温で変形したマントル岩の熱アニソトロピーを調査する.
- 変形が最上層のマントルの熱拡散性にどのように影響するかを理解するために.
- マントルのダイナミクスに対するストレンス誘発の熱アニソトロピーの影響を評価する.
主な方法:
- 変形したマントル岩 (2901,250 K) の熱拡散率の実験室測定.
- 上層マントルの熱伝達のペトロフィジカルモデリング.
- オリヴィン方向を推論するために地震アニソトロピーデータの分析.
主要な成果:
- 変形は,最上層のマントルの有意な熱アニソトロピーを誘発する.
- 流動方向に平行な熱輸送は,流動方向に垂直であるよりも最大30%速くなります.
- ストレスを誘発した熱アニソトロピーは上層マントルの温度,レオロジー,動力学に影響します.
結論:
- 変形の歴史は,上層マントルの熱構造と動態を制御する重要な要因です.
- 海洋および大陸の環境では,熱アニソトロピーの熱伝達および地質学的プロセスに対する明確な効果が示されています.
- マントルの頂上にあるアニゾトロプ的加熱は,大陸の地質活動に影響を与える可能性があります.
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