太平洋中部下にあるペロブスキート後のレンズとD'熱流
Thorne Lay1, John Hernlund, Edward J Garnero
1Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, USA. thorne@pmc.ucsc.edu
Science (New York, N.Y.)
|November 25, 2006
まとめ
地震データは,地球のD'領域の温度グラデーションを明らかにし,鉄の濃縮によるペロブスキート鉱物の相変化を示唆しています. これは,最下層のマントルの熱構造と熱流に関する新しい洞察を提供します.
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
- 地震学 地震学とは
背景:
- 地球の最も下位のマントルであるD'領域は,複雑な地震構造を示しています.
- その熱的および化学的性質を理解することは,マントルの動力学にとって極めて重要です.
研究 の 目的:
- 太平洋中部下のD'領域の温度グラデーションを推論する.
- 地震の不連続性における鉱物相変化の役割を調査する.
主な方法:
- S波の速度変化の分析.
- 地震不連続の解釈は,鉱物相変遷 (ペロブスキートからポストペロブスキートへ,その逆) として行う.
主要な成果:
- 観測されたS波の速度の急速な増加に続いて減少が観察され,ペアリングされた地震の不連続性を示しています.
- これらの不連続性は,温度によって引き起こされるペロブスキート・ポスト・ペロブスキート・ペロブスキート相変化に起因する.
- 推定地域核-マントル境界熱流は85+/- 25 mW/m2で,地球温暖化熱流下限は13+/- 4 TWで推定される.
- ポストペロブスキート鉱物レンズは,温度上昇 ~ 500 K のために横方向に薄くなります.
結論:
- この研究は,ダブルフェーズ境界の交差を用いて,マントルの最下部の温度グラデーションを制限しています.
- 鉄の濃縮は,この地域の浅い深さでのペロブスキート後の安定性を説明するために提案されています.
- コア・マントル境界の熱流と地球全体の熱流の推定値を提供します.
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