パレオセンの中期北大西洋裂け目の動態は,ヨーロッパのプレート内変形と結びついている
Søren B Nielsen1, Randell Stephenson, Erik Thomsen
1Department of Earth Science, University of Aarhus, Høegh-Guldbergsgade 2, DK-8000 Aarhus C, Denmark. sbn@geo.au.dk
Nature
|December 14, 2007
まとめ
大陸の崩壊は6200万年前にヨーロッパ板の変形に変化をもたらした. この研究は,北大西洋の裂け目をプレート内ストレスの変化と関連付け,マントルの羽根理論を否定している.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- 地球科学 地球科学 地球科学
背景:
- 大陸の分裂はプレート構造とマントルの深層ダイナミクスについての洞察を提供します.
- プレート動力学的再構築には,イベントのタイミングとダイナミクスに関する詳細な情報が欠けている.
- プレート内変形は,プレート境界プロセスによるストレスの変化を記録します.
研究 の 目的:
- 北大西洋の大陸裂けとヨーロッパのプレート内変形の間の因果関係を証明する.
- 大陸の分裂におけるストレス変化の役割を調査する.
- プレート運動学を超えて,地質学的な出来事のタイミングの理解を精錬する.
主な方法:
- ストレスの変化に反応するプレート内変形スタイルの分析.
- 地質学的出来事とプレート構造の再構築の相関.
- プレート境界から大陸の内部へのストレス移転のモデリング.
主要な成果:
- 北大西洋の裂け目 (~62万年前) とヨーロッパ板内変形の変化との間には因果関係があることが判明しました.
- 北大西洋のリフトは,ヨーロッパとアフリカの収束を一時停止させた.
- ヨーロッパでは,収縮性プレート内変形が停止し,ストレス緩和によって置き換えられました.
- マントルの羽根ではなく,断裂前の構造的ストレスが,大陸の分裂を促した可能性が高い.
結論:
- 大陸の分裂は,プレート内ストレスの変化と直接関連しています.
- 大陸内層学記録は,地質学的な出来事の決定的なタイミングとダイナミックな情報を提供します.
- マントルの羽根ではなく,プレート構造が大陸の分裂を促し,マントルの深層のダイナミクスに影響を与える可能性があります.
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