地球の下層マントルの構造と動態
Edward J Garnero1, Allen K McNamara
1School of Earth and Space Exploration, Arizona State University, Box 871404, Tempe, AZ 85287, USA. garnero@asu.edu
Science (New York, N.Y.)
|May 3, 2008
まとめ
地球の下層マントルのダイナミクスは,惑星の進化にとって極めて重要です. 地震と鉱物物理学のデータは,独特な州とペロブスキートからポストペロブスキートへの段階移行を含む深いマントルの構造を明らかにします.
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
- 惑星科学 惑星科学
背景:
- 地球の下層マントルの過程は,惑星の進化に大きく影響を与えます.
- これらのプロセスを理解するには,地震学と鉱物物理学のデータを統合する必要があります.
- 深いマントルの構造は,大きな低切断速度の領域のように,化学的に異なる物質を示唆しています.
研究 の 目的:
- 最近の地震学と鉱物物理学の発見を地球の下層マントルの地動力学的に一貫したモデルに統合する.
- 深いマントルの構造と,それが惑星の進化に及ぼす影響を解釈する.
主な方法:
- 高解像度地震学研究の分析.
- 段階移行に関する鉱物物理学のデータの統合.
- 解釈の可行性を評価するためのジオダイナミックモデリング.
主要な成果:
- 密度が高く,化学的に異なる材料で構成されている可能性が高い2つの大きな,対極の低切断速度領域の識別.
- 最も深いマントルのペロブスキートからポストペロブスキートへのフェーズ移行と一致する地震速度の不連続性の観測.
- 超低地震速度のポケットを通して,深いマグマ室の潜在的識別.
結論:
- 地球の下層マントルは複雑な構造と化学的異質性を表しています.
- ペロブスキートからポストペロブスキートへの移行は,深層マントルの重要な特徴です.
- 深いマントルの構造に関するさらなる研究は,マグマ室のようなプロセスに関する洞察を明らかにするかもしれません.
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