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地球のD'層にあるポストペロブスキットの電気伝導度
Kenji Ohta1, Suzue Onoda, Kei Hirose
1Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan.
Science (New York, N.Y.)
|April 5, 2008
まとめ
地球のD'層のペロブスキート後の段階は,高い電気伝導性を示し,核とマントルの間の角運動量交換に影響を与えます. これは,地球回転速度の10年毎の変動を説明できる.
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
- 固体地球科学 固体地球科学
背景:
- 地球の最も下層のマントル (D'層) は,最近の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により,上層のマントルと比較して独特の物理的特性を表しています.
- この層の電気伝導性を理解することは,地球物理学的現象を説明するために非常に重要です.
研究 の 目的:
- D'層に関連する条件下での (Mg0.9Fe0.1) SiO3の電気伝導性を調査する.
- 地球のコア・マントルの境界線と自転の動態に対するペロフスキート後の電気的性質の影響を評価する.
主な方法:
- (Mg0.9Fe0.1) SiO3の電気伝導性を実験的に決定する.
- D'層をシミュレートする高圧,高温条件下で実施された測定.
主要な成果:
- ペロブスキート後の (Mg0.9Fe0.1) SiO3の電気伝導性は,1メートルあたり10(2) シエメン以上である.
- 導電性は,D'層条件下での温度との最小の変動を示しています.
- ポストペロブスキート層は,流体核と固体マントルの間の電磁結合を強化する.
結論:
- D'層のポストペロブスキートの高かつ安定した電気伝導性は,角運動量交換を容易にし,地球の昼間の長さの観察された10年間の変化を潜在的に説明します.
- D''層の伝導性の横向的な変動は,温度変動ではなく,化学的異質性によって引き起こされる可能性が高い.
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