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グローバル電磁誘導制約は,移行ゾーンの水分含有量変動に影響します
Anna Kelbert1, Adam Schultz, Gary Egbert
1College of Oceanic & Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA.
Nature
|August 21, 2009
まとめ
水はマントルの特性に大きな影響を与えます. この研究は,マントルの移行地帯における大きな電気伝導性の変動を明らかにし,地板の沈下によってもたらされる可能性が高い水分含有量の大きな変動を示唆しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- ミネラル物理学 ミネラル物理学
- 地震学 地震学とは
背景:
- 水分含有量は,粘度や地震速度などのマントルの物質特性に大きな影響を与えます.
- マントル鉱物,特にワドスレイライトとリングウッドライトの電気伝導性は,水素 (水) 含有量に対して非常に敏感です.
- マントルの移行地帯の水分含有量は,地球の動力学と地化学に重大な影響を及ぼします.
研究 の 目的:
- 地球のマントルのグローバルな3D電気伝導性モデルを開発する.
- マントルの移行地帯における電気伝導性の変動と水分含有量との関係を調査する.
- 地理学的データを用いてマントルの移行地帯の水分分布を制限する.
主な方法:
- 長期地磁気反応機能の逆転.
- 世界規模の3D電気伝導性モデルの開発.
- マントルの移行領域における伝導性の変動の分析.
主要な成果:
- マントルのトランジションゾーンで約1次元の電気伝導性の変動を明らかにした.
- 低圧スラブに関連した寒い,地震速度の高い地域では,より高い伝導性が観察されました.
- マントルの移行地帯全体で水分量の有意な空間的変動を特定しました.
結論:
- 観測された電気伝導性のパターンは,マントルの移行地帯の水分含有量の大きな変動によって合理的に説明されます.
- 寒い地形板が潜り込み,水をマントルの移行地帯に運ぶ可能性が高い.
- 水分量に関する地質学的制約は,マントルの動態と進化の理解を向上させる.
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