中洋のの熱水システムの構造と動態
D Coumou1, T Driesner, C A Heinrich
1Department of Earth Sciences, Eidgenössische Technische Hochschule-Zurich, Clausiusstrasse 25, Zurich 9082, Switzerland. coumou@pik-potsdam.de
Science (New York, N.Y.)
|September 27, 2008
まとめ
海底下部の熱水コンベクションは,海中山脊の効率的なパイプのような構造に自己組織化します. このプロセスは熱伝導と金属浸出を最適化し,大規模な硫化鉱石鉱床を形成するために不可欠です.
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
- ミネラロジーは,鉱物学です.
背景:
- 海底下部の水熱コンベクションは,大海の真ん中の山脊で,地球の熱伝達メカニズムの主なものです.
- このプロセスは,大規模な硫化鉱石鉱床の形成に重要な役割を果たします.
- これらのシステムの正確な3次元構造とダイナミックな振る舞いは依然として不確実である.
研究 の 目的:
- 海底下水熱コンベクションの3次元構造とダイナミクスを調査する.
- これらのコンベクション細胞内の自己組織化プロセスを理解するために.
- 大規模な硫化鉱石鉱床の形成への影響を明らかにするために.
主な方法:
- 三次元数値シミュレーションを利用した.
- 海底下部の熱水システムにおける流体流れと熱伝達のモデル化.
- その結果得られたコンベクションセル構成と流体力学を分析した.
主要な成果:
- コンベクション細胞の自己組織化が,パイプのような上流ゾーンに示されている.
- アップフローゾーンを囲む集中した,暖かい下流の狭いゾーンを特定しました.
- シミュレートされた非常に短い流体滞在時間は,わずか3年です.
- 非線形流体特性によって導かれる同心流体幾何学を明らかにした.
結論:
- 自己組織化されたコンベクション構造は,鉱石形成のための熱伝送と金属浸出を最適化します.
- この発見は,大規模な硫化鉱石鉱床のダイナミクスに関する新しい洞察を提供します.
- 観測された流動幾何学は,他の地殻の流体流動系についての理解を促す可能性がある.
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