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Ultrasound Velocity Measurement in a Liquid Metal Electrode
Published on: August 5, 2015
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大洋の低速帯における初期融解中の電気伝導度
David Sifré1, Emmanuel Gardés2, Malcolm Massuyeau1
11] Université d'Orléans, Institut des Sciences de la Terre d'Orléans (ISTO), Unité mixte de recherche (UMR) 7327, 45071 Orléans, France [2] Centre National de la Recherche Scientifique (CNRS)/ISTO, UMR 7327, 45071 Orléans, France [3] Bureau des Recherches Géologiques et Minières, ISTO, UMR 7327, BP 36009, 45060 Orléans, France.
Nature
|May 3, 2014
まとめ
二酸化炭素が豊富な初期の溶解は,プレート構造の重要な要因であるアステノスフィアの高い電気伝導性を説明します. この発見は,マントルの地質物理学を理解する上で以前の限界を解決します.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- マントル・ペトロロジー マントル・ペトロロジー
- 地質化学 地質化学
背景:
- 低粘度上層マントルの層であるアステノスフィアは,プレートテクトニクスにとって極めて重要です.
- アステノスフィアの地震および電気的性質は議論されており,オリヴィンまたは部分溶融の水の欠陥を含む説明がされています.
- 以前のモデルでは,オリビンの水分と溶融分数/アステノスフィアの温度での移動性に関する制限に直面していました.
研究 の 目的:
- アステノスフィアの条件に関連した初期溶解 (CO2豊富なおよびH2O豊富な) の電気伝導性を調査する.
- 地質学的観測と上層マントルの地質学的および地化学的な制約を調和させる.
- 融解特性とマントルの枯渇に基づいてアステノスフィアの伝導性プロフィールをモデル化します.
主な方法:
- 様々なCO2およびH2Oの溶融組成物の電気伝導性の実験的決定.
- マントルの枯渇と初期の融解プロセスを考慮した石油学的モデリング.
- 異なる地質プレート年代におけるアステノスフィアの伝導性プロファイルの計算.
主要な成果:
- 電気伝導性は,水とCO2で適度に増加するが,溶液中のCO2の6重%以上で急激に増加する.
- 初期の溶融,特にCO2に富む溶融は,アステノスフィアで観測される高い電気伝導性を生み出すことができます.
- 予測された導電性プロファイルは,様々なプレート時代の地質学的データと一致する不連続性を示しています.
結論:
- CO2に富んだ初期溶融は,高いアステノスフィアの電気伝導性の実現可能な説明を提供します.
- このモデルは,地質学的な枠組みの中で地震と電気の観測を一貫して統合しています.
- この発見は,アステノスフィアの性質とプレートテクトニックのプロセスを制御する上で,溶融の組成と豊富さの役割を強調しています.
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