大陸積層のダイナミクス
L Moresi1, P G Betts2, M S Miller3
11] School of Geosciences, Monash University, Clayton, Victoria 3800, Australia [2] School of Mathematical Sciences, Monash University, Clayton, Victoria 3800, Australia [3] School of Earth Sciences, University of Melbourne, Parkville, Victoria 3010, Australia.
Nature
|March 28, 2014
まとめ
収縮性山帯は,合流するプレート縁で形成される. 立体モデルは,沈下ゾーンの進化を明らかにし,曲線のあるオロジェニックシステムを形成し,溝の移動によりバックアークの脱出を可能にします.
科学分野:
- 地質学 地質学 地質学
- テクトニクス (地質学) とは
- ジオダイナミクスは地力学です.
背景:
- コンチネンタル成長の場所であるアクレション性オロゲンは,サブドクションゾーンが浮遊地殻を消費する収束プレート縁で形成されます.
- 例としては,北米のコルディエラ山脈,南南太平洋の沈殿地,タスマニド山,アルタイド山などがある.
- 長い寿命の蓄積性オロゲンは,地殻の拡張と,サブドクション・ロールバックに関連したバック・アーク・盆地開発を経験する.
研究 の 目的:
- 初期衝突から安定した収束に至るまで,増積限界の進化をモデリングする.
- オーロゲン曲線とバックアーク構造の脱出の発展を調査する.
- 複雑なオロゲン系における溝移動の役割を理解する.
主な方法:
- プレートマージンの進化の3次元ダイナミックモデリング.
- 地質学的および地球物理学的証拠の分析.
主要な成果:
- モデルは,安定した収束性マージンの再確立に続くマージン不安定性を示しています.
- 重要なオロゲン系曲線とバックアークの脱出メカニズムが図示されています.
- 横断地溝の回転は,プレート境界に平行に移動し,システムの複雑さを引き起こします.
結論:
- 浮遊する地殻によるサブドクションゾーンの混雑は,蓄積的なオロゲン形成と大陸の成長につながります.
- トレンチ・ロールバックと移行は,複雑で曲線のあるオロゲン系を発展させ,バック・アークの脱出を容易にするための重要なメカニズムです.
- このプロセスは,タスマニド諸島で証明された,繰り返し起こる世界的な現象です.
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