サブドクションのダイナミクスとアンデス山脈のオロゲニーとボリビアのオロクリンの起源
F A Capitanio1, C Faccenna, S Zlotnik
1School of Geosciences, Monash University, Clayton, 3800 Victoria, Australia. fabio.capitanio@monash.edu
Nature
|November 25, 2011
まとめ
アンデス山脈とボリビアのオロクリンは,ナスカプレートによって形成された.
科学分野:
- 地質学 地質学 地質学
- テクトニクス (地質学) とは
- 地質物理学 地質物理学とは地質物理学です.
背景:
- アンデス山脈は南米の下にあるナズカプレートの沈下によって形成された.
- アンデス山脈とボリビアのオロクリンの形成は,メソゾーイク時代以来の継続的な沈殿にもかかわらず,説明がつかないままです.
研究 の 目的:
- アンデス山脈とボリビアのオロクリンのケノゾイク形成の背後にあるメカニズムを調査する.
- アンデス山脈のオロジェニーが遅発した理由を説明するために.
主な方法:
- 三次元数値潜水模型を使用しました.
- ナスカ・プレート・スラブの厚さと溝の年齢の変動を分析した.
- その結果,上部板の加厚と張力分布を検証した.
主要な成果:
- 溝のナズカプレート年齢の変動は,スラブの厚さの違いを生み出し,コルディレラ形状学につながります.
- 古いナズカプレートの沈下は南米の地殻を厚くし,中央アンデス山脈のより高い標高を説明します.
- プレート加厚は,溝に沿った力を変化させ,アンデス山脈の幅と多様な構造的なスタイルに責任を負う凸なボリビアのオロクラインとストレスベルトを形成します.
結論:
- アンデス山脈のオロゲニーとオロクリン形成は,ナズカプレートの年齢分布と関連しており,これはエオセーン時代に満たされた条件です.
- このモデルは,観察されたアンデス山脈の形態学,高さ,およびオロクリンの曲線をうまく説明しています.
- この発見は,アンデス山脈のオロゲーニーの遅れた始まりに関する長年の謎を解明した.
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