東太平洋上昇の下のマントルの上流の歪みは,セグメンテーションを統制する
Douglas R Toomey1, David Jousselin, Robert A Dunn
1Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403, USA. drt@uoregon.edu
Nature
|March 23, 2007
まとめ
イースト・パシフィック・ライズの下のマントルの上流は対称ではない. 地震画像は,マントルの回転構造を明らかにし,マグマの配送とのセグメンテーションに影響を与えています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 海洋学 海洋学とは
- テクトニクス (地質学) とは
背景:
- マントルの上流は,海中の山脊の海殻形成に不可欠である.
- 座標的なマントルの上流は,活発な山脊の支配的な仮定です.
研究 の 目的:
- 地震画像を用いて東太平洋上昇の下のマントルの構造を調査する.
- マントルの上流,マグマの分布,そして海中のセグメンテーションの関係を理解するために.
主な方法:
- 地震画像は,マントルの同otropic と anisotropic 構造を分析するために使用されました.
- マントルの融解分布と上昇頂層のセグメンテーションの相関分析.
主要な成果:
- 東太平洋上昇の下のマントルの同otropic と anisotropic 構造は回転しています.
- マントルの融解の分布は,上昇した山頂のセグメンテーションと相関しています.
- 地震アニソトロピーは,マントルの流れがプレート拡散方向から反時計方向に ~10度回転していることを示しています.
結論:
- 非対称なアステノスフィアの上流と輸送は,東太平洋上昇のセグメンテーションに大きな影響を与えます.
- この非対称性は,マグマの供給と山脊の頂上過程の変動につながり,軸上および軸外での溶融分布に影響を与えます.
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