熱化学的なマントルの羽ばたきによって引き起こされた洪水ベースルトの複数の火山エピソード
Shu-Chuan Lin1, Peter E van Keken
1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA. skylin@umich.edu
Nature
|July 15, 2005
まとめ
マントルの羽根は,単一の噴火だけでなく,複雑なプロセスを通して大規模な火山地帯を作り出す可能性があります. 数学的実験は,密度の高い物質の引き寄せが,何百万年にもわたって,多種多様な火山脈を発生させる可能性があることを示しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地質化学 地質化学
- 火山学 火山学とは
背景:
- 大規模な火山地域 (LIP) は,大規模な火山イベントであり,しばしば大量絶滅に関連しています.
- 以前のモデルでは,単一の,短命なマントルの羽根が数百万年以内にLIPを生成することを提案していました.
- 最近のジオクロノロジカルデータによると,LIPは,何百万年にもわたる複数の噴火パルスを含むことが多い.
研究 の 目的:
- LIP形成の背後にある複雑なプロセスを調査するために.
- シングルステージの羽根モデルと,マルチパルス噴火の観測を調和させるため.
- 羽根ダイナミクスにおけるマントルの組成の役割を調査する.
主な方法:
- マントルの羽毛と石層の相互作用をシミュレートする数値実験.
- 密度の高い,エコロギット由来物質が熱帯に浸透する様子をモデル化.
- 二次的な不安定性と羽根の強さの変動の発展を分析する.
主要な成果:
- 密度の高い物質の引き寄せは,マントルの羽根に二次的な不安定性をもたらします.
- これらの不安定性は,多重で多様なマグマフルースのエピソードにつながります.
- 不安定性の発展の時間スケールは,観測されたLIP噴火の持続時間と一致します.
結論:
- LIPを説明するには,単純な熱い羽根モデルだけでは不十分です.
- 熱い羽根と相互作用する複合浮力力は,複雑な噴火の歴史を駆動する.
- このメカニズムは,複数エピソードのLIPとその関連する環境影響を理解するための枠組みを提供します.
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