50-Ma ハワイアン-皇帝の曲がりの開始は,太平洋プレート運動の大きな変化を記録しています
Warren D Sharp1, David A Clague
1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA. wsharp@bgc.org
まとめ
ハワイアン-皇帝の曲がりです.
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)
- 火山学 火山学とは
背景:
- ハワイ - 皇帝の曲がりは,太平洋プレート運動の歴史を理解するための重要な特徴です.
- 以前の解釈では,ハワイのホットスポットが減速しているため,曲線が形成されたと考えられていた.
- プレート運動の変化のテンポは議論されてきた.
研究 の 目的:
- ハワイ - 皇帝の曲がりの形成メカニズムを再評価する.
- 火山の移動率と火山連鎖の傾向との関係を調査する.
- ホットスポット行動やプレート運動の変化による曲線かどうかを判断する.
主な方法:
- 中部と南部の皇帝連鎖の火山の年代測定.
- 火山の移動速度に関する分析.
- 太平洋の広がる中心の活動と西太平洋の弧状マグマティズムとの相関.
主要な成果:
- 新しい火山時代は,移住率の大きな変化を示しています.
- これらのレート変更は,チェーン全体のトレンドの最小限の変更で発生しました.
- 約5千万年前の曲線の開始は,太平洋の広がりの中心再調整と一致しました.
結論:
- ハワイのホットスポットが減速しているため,ハワイの皇帝の曲がりは形成されませんでした.
- 証拠は,太平洋プレート運動の変化によって曲線の形成を裏付けている.
- タイミングは,西太平洋の地質学的な出来事と一致しています.
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