マントルの融解中の貴気体の"ゼロチャージ"分割行動

R A Brooker¹, Z Du, J D Blundy

¹CETSEI, Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol BS8 1RJ, UK. r.a.brooker@bristol.ac.uk

Nature

|June 13, 2003

まとめ

高貴なガスの地化学は,惑星のプロセスの仕組みを明らかにします. 私たちの実験は,貴重ガスがこれまで考えられていたよりも相容れないことを示し,マントルダイナミクスと大気形成のモデルを洗練しています.

科学分野:

地質化学地質化学
惑星科学惑星科学
地質物理学地質物理学とは地質物理学です.

背景:

ノーブルガスの地化学は,マントルの動力学と大気形成を含む惑星の進化を理解するために重要である.
正確なモデリングは,地質学的過程で結晶と溶融の間に貴重ガスの分割を理解することに依存しています.
伝統的なモデルでは,貴重ガスは高度に相容れない元素であり,マントルの融解中に効率的に抽出されていると仮定しています.

研究の目的:

高貴ガスの結晶溶融分断の振る舞いを実験的に決定する.
高貴ガス不適合性を再評価することによって,惑星過程の地球化学モデルを精製する.
鉱物学に基づいた貴重ガス地球化学の理論的枠組みを開発する.

主な方法:

結晶シリケートと溶液の間の貴重ガス分割係数の実験的決定.
高貴ガスの組み込みメカニズムを調査するための原子学的コンピューターシミュレーション.
パーティションの振る舞いを説明するために,格子ストレインモデルの適用.

主要な成果:

実験データによると,高貴なガスは,これまで考えられていたよりも相容れない.
結果は,高貴ガスが従来のモデルが示唆するほど単純に振る舞わないことを示唆している.
原子学的シミュレーションでは,貴重ガスが結晶格子の中で"ゼロチャージ"の種として作用することを明らかにしています.

結論:

ノーブルガスの分割は,これまで理解されていたよりも複雑で,精巧な地化学モデルが必要です.
この研究は,貴重ガス地化学と残留マントル鉱物学を結びつける新しい理論的枠組みを提供します.
この発見は,惑星の増殖,マントルの進化,大気の進化の理解に影響を与えます.

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