海底バチメトリーの気象による気象変動に対する感度

J-A Olive¹, M D Behn², G Ito³

¹Lamont-Doherty Earth Observatory, Columbia University, Palisades NY, USA. jaolive@ldeo.columbia.edu.

Science (New York, N.Y.)

|October 17, 2015

まとめ

海底のバチメトリーはゆっくりと急速な変化ではなく海洋中部のマグマの供給を示しています私たちのモデルは,海底のプロセスが短期的なマグマの変動をフィルターし, 地球の洞察を提供することを示しています

科学分野:

地質学と地質学
海洋地質学と地力学

背景:

以前の研究では,海平面の変化に関連した急速な (23 〜 100 キル) のマグマ供給の変動を記録した.
これらの変動は,マントルの溶融の生成を調節し,海底の地形に影響を与えると考えられていた.

研究の目的:

マグマの供給の変動と海底のバチメトリック構造の関係を調べる.
マグマ供給の変動に対する海底形成過程のフィルタリング能力を決定する.
海底の波長と広がる速度の相関を説明する.

主な方法:

断層とマグマの配置の定量モデルを使用した.
マグマ供給の変動への影響を評価するために,海底形成プロセスをシミュレートします.
モデル予測と海底の波長と拡散率の経験的データを比較した.

主要な成果:

海底形成プロセスが低通行フィルターとして作用し,約10万年未満のマグマ供給の変動を大幅に抑制することを実証した.
観測された海底の波長の減少と広がる速度の増加は,安定したマグマの入力モデルと一致していることが示されました.
急速なマグマ供給の変動が信頼性の高い記録ではないことがわかりました

結論:

海底の地形は主にマグマ供給の長期 (> 100 キル) の変動を反映し,急速な変動ではありません.
断層の成長と断層の放棄のモデルは安定したマグマの流れで海底の構造を明確に説明します
これは,マントルの融解過程を深淵の丘の構造から解釈するための枠組みを提供します.

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