マグマによって維持された裂け目のセグメンテーションは,2005年のアファー・ダイキング・エピソードで大陸の断裂時に発生した
Tim J Wright1, Cindy Ebinger, Juliet Biggs
1Department of Earth Sciences, University of Oxford, Oxford OX1 3PR, UK. t.wright@see.leeds.ac.uk
Nature
|July 21, 2006
まとめ
断層ではなく,ダイキングによるマグマの侵入が,大陸の断層分割を推進する. 2005年のダバフマグマセグメント破裂は,急速なマグマ注入が陸上での裂け目の分割を開始したことを示しています.
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
- 火山学 火山学とは
背景:
- 海底の拡散センターは,セグメント化されたマグマ供給に起因する規則的な軸に沿ったセグメンテーションを示しています.
- 大陸の裂け方は通常,通常の断層によって分割され,しばしば重要なマグマティズムが欠け,埋め込みプロセスは不明確になります.
研究 の 目的:
- 大陸の破裂時に溶融地帯の置換のメカニズムを調査する.
- 大陸の裂け目を分割するマグマの侵入の役割を理解するために.
主な方法:
- 2005年のダバフ・リフト・エピソード中の衛星レーダーデータを用いて3次元変形場の分析.
- 変形と地震破裂の貢献を定量化するための弾性モデリング.
- マグマの侵入のタイミングと範囲を決定するための地震データ分析.
主要な成果:
- 60キロメートルのダバフマグマティックセグメント全体が破裂し,衛星地質学によって記録された最大の大陸のイベントを表しています.
- マグマは,ダイクに沿って2〜9kmの深さで注入され,約2.5km3の体積で注入されました.
- 地震破裂は観測された変形のわずか8%を占め,マグマ圧力が主な要因であることを示している.
結論:
- セグメンテッド正規断層ではなく,ダイキングによるマグマ侵入は,このセクターで軸に沿ったセグメンテーションを維持し,開始する主要なプロセスです.
- 1週間未満で発生したダバフ堤防の急速な侵入は,大陸裂け目におけるマグマ的セグメンテーションのダイナミックな性質を強調しています.
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