地球上のプレート構造は,羽根誘発の潜水開始によって引き起こされる
T V Gerya1, R J Stern2, M Baes3
1Department of Earth Sciences, ETH-Zurich, Sonneggstrasse 5, 8092 Zurich, Switzerland.
Nature
|November 13, 2015
まとめ
初期の地球
科学分野:
- 地理学
- 構造学
- 地球科学
背景:
- 地球のプレート構造と沈殿の起源は 十分に理解されていません
- サブダクションの開始のためのプレートプレート構造のメカニズムは,現代のプロセスと大きく異なっていた.
研究 の 目的:
- プレート構造の発生のためのメカニズムとして,羽根誘発の潜水開始の生存可能性を調査する.
- 自己持続的な沈殿を制御する重要な物理的要因を特定する.
主な方法:
- 高解像度の3次元数値熱力学モデルが採用されました.
- シミュレーションは,マントルの羽根と海洋の石層の相互作用を調査した.
主要な成果:
- 自給自足の潜水を開始するには,強い,負の浮遊する海洋石層が必要です.
- マグマの弱まりと地殻の潤滑が重要だ
- 熱い初期の地球上の古い海洋プレートには 羽根誘導による沈殿が可能でした
結論:
- マントルの羽根が 初期の地球で最初の潜水地帯を 引き起こしたのかもしれません
- 海洋プレートより若い層は 持続的な沈殿よりも 石層の滴り方を好み,地球プレート構造の発生を阻害した.
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