エネルギーフィードバックが大陸の強さに与える影響

Klaus Regenauer-Lieb¹, Roberto F Weinberg, Gideon Rosenbaum

¹Institut für Geowissenschaften, Johannes Gutenberg Universität, Mainz 55099, Germany. klaus@cyllene.uwa.edu.au

Nature

|July 11, 2006

まとめ

大陸の強さは,ダイナミックな相互作用により,これまで考えられていたよりも弱くなっています. この研究は,大陸の変形の間に新しい断層と分離層を明らかにしています.

科学分野:

地質物理学地質物理学とは地質物理学です.
テクトニクス (地質学) とは
コンピューティングジオダイナミクス

背景:

大陸の強さの古典的なモデルは,準静的レオロギーに依存し,脆いと柔らかい地殻層の間のダイナミックな相互作用を無視しています.
これらの相互作用は,脆性-柔性移行の故障プロセスを複雑化し,ストレスの局所化のための結合エネルギー考慮を必要とします.

研究の目的:

完全に結合されたエネルギー,モメンタム,連続体の方程式を解決することによって大陸の変形を調査する.
大陸の変形を制御する動的な強さの進化と複雑なフィードバックプロセスを理解する.

主な方法:

コンチネンタル変形をモデル化するために,完全に結合されたエネルギー,モメンタム,連続体の方程式を解く.
脆性-柔性移行におけるストレスの局所化と分離欠陥の形成を分析する.

主要な成果:

大陸の動的強さの進化は,静的モデルによって予測されたものより著しく弱くなっています.
脆性-柔性移行におけるストレスの局所化は,自発的に真ん中の地殻脱離の欠陥を生成します.
下層地殻とマントルの間に追加の分離層が形成され,観測された水平運動を説明します.

結論:

地殻の層間のダイナミックな相互作用は,大陸の強度プロフィールを根本的に変化させます.
このモデルは,大陸変形における大規模な水平移動に責任を負う観察された解離層の形成を説明しています.
この研究は,大陸の構造学を理解するためのより正確でダイナミックな枠組みを提供します.

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