地球の深い上層マントルの条件で水性シリケート溶融の密度
Kyoko N Matsukage1, Zhicheng Jing, Shun-ichiro Karato
1Department of Environmental Sciences, Ibaraki University, Mito, Ibaraki 310-0056, Japan. kmatsu@mx.ibaraki.ac.jp
Nature
|November 25, 2005
まとめ
水性シリケートの融解密度は410kmの深さで,元素の結合を理解するための鍵です. 水 水 水 水 水 でした.
科学分野:
- 地質化学 地質化学
- ミネラル物理学 ミネラル物理学
- 惑星科学 惑星科学
背景:
- シリケート溶融密度は,地上の惑星における化学的進化と元素の結合を制御する.
- 以前の研究は,乾燥溶融に焦点を当て,深層マントルの圧力とともに密度が増加することを示唆していた.
- 深いマントルの溶融には水が含まれ,溶融密度を低下させる可能性があると予想されています.
研究 の 目的:
- 水性シリケート溶融の密度を410kmの深さで測定する.
- 高圧条件下での溶融密度に対する水分の影響を評価する.
- 410kmの不連続性における溶融トラッピングと元素結合の可能性を評価する.
主な方法:
- 水性シリケートの融解密度の実験的決定.
- マントルの条件をシミュレートする高圧,高温実験.
- 溶融の圧縮性と水の役割の分析.
主要な成果:
- シリケート溶融の水は圧縮性が高く,高圧下では密度低下効果が低下する.
- 水性シリケートの融解密度は,周囲の固体の融解密度を約410kmの深さで上回る可能性があります.
- 融解の組成は,密度と圧縮性に大きな影響を与えます.
結論:
- 410kmの境界で水溶性溶液を捕まえるために,さまざまな条件が存在します.
- この捕獲メカニズムは,深層マントルで互換性のない元素を封じ込めることを可能にします.
- 融解の組成とマントルの状態を理解することは,元素の分布を予測するために極めて重要です.
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