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Updated: May 2, 2026
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Magnetic Tweezers for the Measurement of Twist and Torque
Published on: May 19, 2014
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ホットスポット・トラックの欠如において,絶対的なプレート運動と真の極の漂流は,ホットスポット・トラックの欠如で起こる
Bernhard Steinberger1, Trond H Torsvik
1Centre for Geodynamics, Geological Survey of Norway, Leiv Eirikssons vei 39, 7491 Trondheim, Norway. bernhard.steinberger@ngu.no
Nature
|April 4, 2008
まとめ
この研究は,3億2000万年以上にわたる真の極流動とプレート運動を区別する. 独特な回転現象を明らかにし,長期のジオイドの安定性とマントルのプロセスのための新しい基準枠を示唆しています.
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)
- パレオマグネティズムは,古磁気学です.
背景:
- 地球の回転軸に相対する大陸の移動は,真の極流動または個々のプレート移動の結果である可能性があります.
- これらの運動を区別することは,長期的な地球の動態を理解するために非常に重要です.
- パンゲア超大陸の3億2000万年前の形成は,重要な時間枠を提供します.
研究 の 目的:
- 過去3億2000万年における真の極流動とプレート運動を区別するために,
- 古磁気基準枠内の地球平均の大陸運動と回転を計算する.
- 表面処理と深層マントルの処理を関連付けるための新しい基準枠を確立する.
主な方法:
- 古磁気データを用いて地球平均の大陸の移動と回転を計算した.
- パンゲアの形成以来,過去3億2000万年のデータを分析した.
- 安定した北向きの動きと,明確な回転現象の構成要素を特定した.
主要な成果:
- 安定した北向きの大陸漂流と重要な真の極地漂流のイベントを特定しました.
- 記録された反時計回転 (250~220万年前) と時計回転 (195~145万年前) が,将来の三重交点付近の特定の軸を回っている.
- さらに北アフリカ/アラビアの軸の周りを回転した (145~135万年前,110~100万年前) が観測され,ジオイドの最大値と相関している.
結論:
- 特定された回転は,真の極地漂流イベントの証拠を提供します.
- 3億2000万年以上にわたるゼロに近い純回転は,長期のジオイドとマントルの構造の安定性を示している.
- マントルのプロセス研究のために,真の極流浪のために修正された,新しい古磁気学に基づく基準フレームが提案されています.
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