アフリカの下の基礎マントルの構造の組み立て
Nicolas Flament1, Ömer F Bodur2, Simon E Williams3
1GeoQuEST Research Centre, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, New South Wales, Australia. nflament@uow.edu.au.
Nature
|March 31, 2022
まとめ
火山活動に関連した深層構造は 固定ではなく 移動可能である. マントルの流れを再構築すると,これらの基礎マントルの構造は,大陸と似て地質的な時間にわたって集積し,分散することを示唆しています.
科学分野:
- 地理学
- 地力学
- 地球科学
背景:
- プレート構造は 地球の内部の動きによって引き起こされます
- 火山はマントルの羽根と 海洋の石層と関連しています
- アフリカと太平洋の下にある大きな基礎マントルの構造は静止していると考えられている.
研究 の 目的:
- 過去10億年のマントルの流れを再構築する
- 基本マントルの構造を 動かすか 静止するかの仮説を検証する
- 地球の火山の歴史とマントルの構造のダイナミクスを結びつけるため
主な方法:
- 10億年前から現在までのマントルの流れの再構築
- 移転可能なマントル構造と固定されたマントル構造を比較した統計分析.
- 地質学と地化学データを統合する.
主要な成果:
- マントルの流れの再構築は,移動的および固定的な基礎マントルの構造と一致しています.
- 寒い石層は 7億4000万年から5億年前に アフリカ半球に沈みました
- アフリカの下の構造は 4億年前から徐々に組み立てられ 6千万年前に統合されました
- 基礎マントルの構造は移動し,時間とともに集積し,分散する.
- アフリカの下のマントルには 大陸の物質が予測されています
結論:
- 基礎マントルの構造は移動可能であり,静止ではない.
- マントルの構造のダイナミクスは,長期の火山活動に影響します.
- 基礎マントルの構造の進化は 大陸の移動を反映しています
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