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サブドクションは,地球のプレートの分布と断片化を制御します

Claire Mallard, Nicolas Coltice, Maria Seton

|June 17, 2016

まとめ

地球のプレート構造は,マントルのコンベクションと石層の強さの間のフィードバックループによって形成されます. このダイナミックなプロセスは,プレートサイズのフラクタル分布と長期のレイアウトを説明します.

科学分野:

地理学
構造学
地球科学

背景:

プレート構造理論では地球の表面が大きく小さなプレートに分割されていると説明しています
プレートサイズ分布と長期のレイアウトを制御する力はほとんど不明のままです.
以前の統計分析では,プレートサイズと石層およびマントルのコンベクション特性を関連付けることができませんでした.

研究の目的:

地球のプレートレイアウトを制御するダイナミックなフィードバックメカニズムを示すために
マントルのコンベクションと石層の強さがプレートサイズ分布をどのように決定するか説明する.
プレート形成の原動力を調査する

主な方法:

マントルの3次元球形モデルを使用した.
地球の観測と一致する自己一貫したプレートサイズ周波数分布をシミュレートした.
サブダクション幾何学とトレンチ誘発の役割を分析した.

主要な成果:

マントルのコンベクションとリトスフィアの強さの間のダイナミックフィードバックによって動かされるプレートレイアウトをモデル化.
描かれた潜水地形は,構造破片化とプレート生成を指示する.
プレート断片化における重要な要因として,プレート間隔と溝の屈曲のストレスを特定した.

結論:

地球の観測されたプレートサイズ分布は,マントルの対流と石層の相互作用の産物である.
サブドクションのダイナミクスはプレート形成と組織化に不可欠です
コンベクションシミュレーションは,地球構造とマントルの流れの間のダイナミックなつながりについての洞察を提供します.

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