運動変数と水中輸送は,弧火山の形成と位置を制御する
1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. tlgrove@mit.edu
Nature
|June 5, 2009
まとめ
プレートシブドクション プレートシブドクションと収束速度のような動力学的変数は,円弧マグマ形成に影響を与えます. この研究は,これらの要因が熱条件と組み合わせて,火山の弧の位置を予測する方法をモデル化しています.
科学分野:
- 地質学 地質学 地質学
- 地質物理学 地質物理学とは地質物理学です.
- ペトロロジー・ペトロロジーとは
背景:
- 円弧マグマは,マントルのを巻き込み,板の流体/溶融を吸収する,収束板の縁で形成される.
- 円弧マグマの発生に起因する運動変数 (スラブディップ,収束率) の影響については,依然として議論されている.
- 前述の,恒常的な沈下板の深さに関する仮定は,新しい地震データによって異議を唱えている.
研究 の 目的:
- プレート潜水運動とマントルの融解場所の関係をモデル化するために.
- 板の沈みと収束率がマントルの熱構造にどのように影響するかを調査する.
- サブダクションパラメータに基づいて火山の弧の位置を予測する.
主な方法:
- マントルの融解のための熱的条件と運動パラメータを統合したモデルを開発した.
- マントルのにある,固体より熱い領域と鉱物分解領域の重複を分析した.
- 観測された火山の弧の位置と相関する予測された溶融生成ゾーン.
主要な成果:
- スラブ・ディップと収束率は,スラブ・ケイン・インターフェースの深さを体系的に変化させます.
- 融解の発生は,固体よりも熱い領域が鉱物脱水ゾーンと重なり合っているときに起こります.
- このモデルは,マントルのの融解と弧火山の位置を正確に予測します.
結論:
- 運動パラメータは,弧マグマ形成と火山弧の位置づけを理解するために重要である.
- 熱構造と潜水運動の相互作用が,アーチ火山を制御する.
- このモデルは,世界中の火山の弧の位置を予測するための枠組みを提供します.
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