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超大陸と超大洋が海底の荒さに影響を与える方法
Joanne M Whittaker1, R Dietmar Müller, Walter R Roest
1Earthbyte Group, School of Geosciences, Building F09, The University of Sydney, Sydney, New South Wales 2006, Australia. jw@getech.com
Nature
|December 19, 2008
まとめ
海底の荒さは,海洋の熱循環に重大な影響を及ぼします. グローバル分析では,残留の粗さ異常は,単に広がり速度によるものではなく,マントルの上流の差異が海洋地殻の増殖に影響を及ぼすことを示唆しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 海洋学 海洋学とは
- プレート・テクトニクス (プレート・テクトニクス)
背景:
- 海底の荒さによって,海洋の熱循環とエネルギー消耗が制御されます.
- 既存のモデルでは,荒さと広がり率とマントルの相互作用が関連している.
研究 の 目的:
- 広がり率や堆積物の厚さを超えて,世界の海底の荒さについて調査する.
- マントルの上流が海洋の地殻形成に及ぼす影響を理解するために.
主な方法:
- 海洋重力による荒さに関するグローバル分析.
- 堆積物の厚さ,海底のイソクロン,そして古代の広がり率の調査.
- 残った粗さ異常を隔離するための統計分析.
主要な成果:
- 残留粗さ異常 (5-20 mGal) は,拡散速度や堆積物の厚さに関係なく,世界的に存在しています.
- 過剰な粗さは,一般的に傾斜の広がりとは関係ありません.
- クレタ紀の大西洋の海底は異常な低粗度を示しており,これはパンゲア亜マントルの条件に起因する.
- 太平洋のスーパースウェル地域では,重大な荒らさ異常は示されていない.
結論:
- 超大陸と超大洋の下のマントルの上流は,海洋の地殻の蓄積に明確な影響を及ぼします.
- 海底の荒さには,局所的な構造学を超えた深層マントルのプロセスが影響する.
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