トランスクリスタル融解の移動と地球のマントルの移動
Pierre Schiano1, Ariel Provost, Roberto Clocchiatti
1Laboratoire Magmas et Volcans, Observatoire de Physique du Globe, Université Blaise Pascal et CNRS, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France. schiano@opgc.univ-bpclermont.fr
まとめ
マグマインクルージョンは,結晶と溶融の相互作用によって誘発される熱グラデーションの下でオリヴィン結晶を通して移動します. これは溶融分離を説明し,地球のマントルの深層流体相を疑問視する.
科学分野:
- 地質化学 地質化学
- 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
背景:
- プレート構造と火山活動は,マグマとガスダイナミクスによって引き起こされます.
- 地球のマントル内の溶融とガスの振る舞いを理解することは,火山活動と構造学にとって極めて重要です.
研究 の 目的:
- オリヴィン結晶内の溶融インクルージョンの移動メカニズムを熱グラデント下で調査する.
- 融解移動中の溶解したガス泡の振る舞いを理解するために.
- 実験的発見を大規模地質学的プロセスに適用し,深層流体相の存在を再評価する.
主な方法:
- オリヴィン結晶内の溶融インクルージョンの熱グラデーションをシミュレートする実験室での実験.
- 融解とガス泡の動きと相互作用の観測.
- 結晶-溶融界面メカニズムの運動分析.
- 実験結果を地球のマントルの条件にスケーリングする.
主要な成果:
- 溶融インクルージョンは,結晶-溶融界面運動によって制御されるオリヴィン結晶を通して移動します.
- 溶解したガスの泡は不動になり,移動する溶液から分離します.
- 実験結果は,マントルの原始的な溶融の粒度分離を説明しています.
- CO2に富んだ液体インクルージョンは,融解から脱出したガスとして再解釈されます.
結論:
- この研究は,マントル内の粒度スケールでの溶融分離のためのメカニズムを提供します.
- この発見は,広範囲に浸透し,深く浸透する自由流体相の概念に異議を唱える.
- 融解移動実験は,地質学的に適切な条件下で結晶の成長運動に関する洞察を提供します.
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