北大西洋大陸縁の下層地殻の侵入
R S White1, L K Smith, A W Roberts
1Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK.
Nature
|March 28, 2008
まとめ
大陸の裂け方は,大量に塩基岩の融解を産み,そのほとんどが地殻の下部に侵入し,スリーブとして使用されました. マントルのコンベクションではなく,マントルの温度上昇が,大陸の崩壊時にこのマグマチズムを駆動した可能性が高い.
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:
- 大陸の裂け方は大きなマグマティズムを生成しますが,融解の量と原因は依然として議論されています.
- マントルの温度の役割と,破裂中のマグマティズムを駆動する他の要因の役割は不明である.
研究 の 目的:
- 融解量を定量化し,火山の裂け目縁の埋め込みメカニズムを理解する.
- 大陸の崩壊時のマグマティズムの主な原動力を調査する.
主な方法:
- 深い浸透性地震プロフィール (通常の発生率と広角) の取得と分析.
- 地震データの解釈により,融解の侵入と流出をマッピングする.
主要な成果:
- フェロー島とハットン・バンク周辺の量化ベースアルト挤出量 (360~400 km3/km) と侵入量 (540~600 km3/km).
- 特定された下層地殻の侵入は,連続した"下板"ではなく,焦点を当てたスリーブとして特定されました.
- 流出した玄武岩は,裂け目軸から100km以上広がっている.
結論:
- 融解の生成は主にマントルの温度上昇によって制御された.
- 観測されたマグマチズムを説明するために,有意なアクティブマントルのコンベクションまたは肥沃なマントルの存在は必要ではありませんでした.
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