東太平洋上昇の重複する広がりの中心の下でのマントルの溶融の継続的な供給
R A Dunn1, D R Toomey, R S Detrick
1Department of Geological Sciences, University of Oregon, Eugene, OR 97403-1272, USA. Robert_Allen_Dunn@brown.edu
まとめ
東太平洋上昇の重複する拡散センターは,連続した低P波速度を示し,単一のマントル源から一貫した溶融供給を示しています. テクトニックのセグメンテーションは,深さのマグマティックセグメンテーションから直接生じるものではありません.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
- マントラダイナミクス マントラダイナミクス
背景:
- オーバーラップする拡散センター (OSCs) は,中海の山脊の特徴です.
- OSCの下の溶融供給を理解することは,プレート構造学にとって極めて重要です.
- 以前のモデルは,OSCにおける溶融供給の不連続性を示唆していた.
研究 の 目的:
- OSCの下にある上層マントルの速度構造を調査する.
- OSCへのメルト供給の性質を決定する.
- テキトニックとマグマティックセグメンテーションの関係を評価する.
主な方法:
- P波の速度を用いた地震トモグラフィー.
- 上部マントル構造のトモグラフィ画像の分析.
- 温度と融解分子のモデリング.
主要な成果:
- OSCの下には,低P波速度の連続した領域が特定されました.
- これは,いくつかのパーセントの融解がある高温地帯であると解釈しました.
- OSCの両辺は,単一の下層マントルの源から供給されていることが示された.
結論:
- OSCは必ずしも連続しない溶融供給に結びついているわけではない.
- 融解の供給は,より深いマントルの源から継続的に行われます.
- OSCによる山脊の構造的セグメンテーションは,深さのマグマティックセグメンテーションから切り離されている.
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