北米のクレートンにおける石層層構造
Huaiyu Yuan1, Barbara Romanowicz
1Berkeley Seismological Laboratory, 209 McCone Hall, Berkeley, California 94720, USA.
Nature
|August 27, 2010
まとめ
安定した大陸クレートンは,一つではなく,2つの異なる石層層を特徴としています. この発見は,地震データと地化学データとの不一致を解決し,真ん中の石層界を明らかにした.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地質化学 地質化学
- テクトニクス (地質学) とは
背景:
- クラトンは古代の,安定した大陸の地殻の領域であり,数十億年にわたる形成と保存は,重要な地質学的な議論となっています.
- 地震受容器機能の研究は,クラトンの下の浅い構造的境界を特定し,伝統的な石層-アステノスフィアの境界 (LAB) と矛盾しています.
研究 の 目的:
- 地震アニソトロピーを用いて北米大陸の石層の構造を調査する.
- クラトニック・リトスフィアの構造に関する対立する地球物理学的および地球化学的データを調和させる.
主な方法:
- 地震波アジムタルアニソトロピーの分析は,深さとともに変化する.
- 地震データと,クセノリフの熱気圧分析による地化学的推論の比較.
- 地震学,地化学,地力学データの統合.
主要な成果:
- 北米大陸の2つの異なる石層層の証拠は,アジムタルアニソトロピーによって識別されています.
- 上層の厚さは,非常に枯渇した化学層と相関しています.
- 比較的平坦な石層とアステノスフィアの境界 (180~240kmの深さ) が存在し,おそらくは枯渇した層の周りの熱根である.
結論:
- 検出された浅い地震境界線は,LABではなく,中部石層の境界線を表している可能性が高い.
- 発見は多様なデータセットを統合し,北米のクラトニック・リトスフィアの統一モデルを提供します.
- この研究は,古代大陸の石層の複雑な構造と進化を明らかにします.
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