水素含有鉄過酸化物と超低速圏の起源
Jin Liu1, Qingyang Hu1,2, Duck Young Kim2
1Department of Geological Sciences, Stanford University, Stanford, California 94305, USA.
Nature
|November 24, 2017
まとめ
水素含有鉄過酸化物 (FeO2Hx) は,地球の超低速帯 (ULVZ) を説明する. この密度の高い物質は 鉄と水の反応によって形成され ULVZの地震特性と起源に一致します
科学分野:
- 地理学
- 鉱物物理学
- 惑星科学
背景:
- 核-マントルの境界にある超低速帯 (ULVZ) は,地球の構造に対する起源と意味が不明である.
- ピライト型構造の水素含有鉄過酸化物 (FeO2Hx) は,最も低いマントル条件下でも安定している.
研究 の 目的:
- 核-マントルの境界条件下での水素含有鉄過酸化物 (FeO2Hx) の性質を調査する.
- FeO2HxがULVZの地震特性と形成を説明できるかどうかを判断する.
主な方法:
- 高圧実験研究
- 理論的な計算だ
- 地震データを分析する
主要な成果:
- 鉄過酸化物 (FeO2Hx) は,高密度,高ポアソン比率,およびULVZと一致する非常に低い音速を示す.
- 鉄と水の反応は86 GPaと2,200 KでFeO2Hxを生成する.
- この反応は,潜水水とコア鉄を使用したULVZ形成の妥当なメカニズムを提供します.
結論:
- 水素含有鉄過酸化物 (FeO2Hx) はULVZの組成に強い候補である.
- 水による鉄の超酸化は,コア-マントルの境界でULVZの直接的な形成メカニズムを提供します.
- この発見は起源の議論を解決し ULVZの謎の地震特性を説明します
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