北米の下のファラロンプレート沈殿の再構築は,後期白亜紀に遡ります
Lijun Liu1, Sonja Spasojevic, Michael Gurnis
1Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA. lijun@gps.caltech.edu
まとめ
研究者はマントルのコンベクションモデルを使用してファラロンプレート沈殿を再構築した. クレータ紀後期における平らな沈殿が確認され,さらに広範囲の浅い沈殿地帯が1000kmに及ぶことが明らかになった.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- プレート・テクトニクス (プレート・テクトニクス)
- マントラダイナミクス マントラダイナミクス
背景:
- 過去の地質学的な出来事を理解することは,地球のダイナミックなプロセスを解釈する上で極めて重要です.
- ファラロンプレートの沈殿史は,北米の地質学に大きな影響を与えた.
- 以前のモデルには,板の幾何学とマントルの特性に関する詳細な制約が欠けていました.
研究 の 目的:
- ファラロンプレートの沈下の歴史を1億年前に遡って再構築するために.
- 地震データとプレート運動を用いてマントルの粘度と浮力を制限する.
- 平面沈殿のメカニズムと範囲を調査する.
主な方法:
- 逆マントルのコンベクションモデルを利用した.
- 同化された地震構造とプレート運動データ.
- 地質的階層学を用いた限定モデル.
主要な成果:
- 再構築されたファラロンプレート沈殿は,クレタセア後期に平らなプレートがあったことを確認した.
- モデルは,平板板の向こうまで1000kmまで伸びた浅い浸水潜水を示しています.
- 海洋高原の沈殿は,板の平ら化の原因として関与しています.
結論:
- マントルの地震画像は,過去の構造的出来事に対する堅固な制約を提供します.
- ファラロン板の潜水幾何学は精細化されました.
- マントルのコンベクションモデリングは,プレート構造とプレート行動の動態に関する洞察を提供します.
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