ロールバック・サブドクション中のマントルの熱進化の実験室モデル
1Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, USA. kincaid@gso.uri.edu
Nature
|September 5, 2003
まとめ
ロールバック・サブダクションは,2Dモデルと比較して,マントルの流れが速く,プレートの加熱が均一になる. 実験室での実験により,3Dマントルの流通パターンと,プレートロールバックの有無で温度構造が明らかにされています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- ジオダイナミクスは地力学です.
背景:
- 海洋石層の沈下はプレート構造,マントルの進化,そして物質のリサイクルに不可欠です.
- 以前の研究では,の移動やプレート・ロールバックなどの3Dの複雑さを無視して,しばしば2Dへの沈殿を簡素化しています.
- 3Dマントルの流れ,熱条件,化学輸送は,地化学,地震学,地動力学モデルから推測される.
研究 の 目的:
- ロールバックの有無で潜水中の3Dマントルの循環と温度構造を調査,比較する.
- ロールバックコンポーネントの存在または欠如によって引き起こされるマントルダイナミクスの根本的な違いを明らかにする.
主な方法:
- サブダクションプロセスをシミュレートする実験室での実験.
- 3Dマントルの流れパターンの分析.
- マントルのと海洋プレート内の温度分布の測定.
主要な成果:
- ロールバックなしの潜水は,マントルのの流れが遅い,プレート周りの質量流動がなく,プレートエッジでより速く加熱します.
- ロールバック・サブドクション・ドライブは,沈下板の周りを回り,沈下板の下を流れ,マントルのの速度を増加させます.
- ロールバックは,プレートの中心に向かって流れを集中させ,中央線に沿ってプレート表面のより均一な加熱につながります.
結論:
- ロールバックは,非ロールバック潜流と比較して,3Dマントルの循環と熱構造を大幅に変化させます.
- 実験室での実験は,潜水地域地力学の複雑さに重要な洞察を提供します.
- 発見は2Dの仮定に異議を唱え,潜水地帯における3Dプロセスの重要性を強調しています.
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