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海洋地殻の流通した流体の流れは,熱流と浸透性のデータを調和させる
1Earth Sciences Department, University of California, Santa Cruz 95064, USA. afisher@es.ucsc.edu
Nature
|January 19, 2000
まとめ
海底地殻における熱水流体循環は,海洋と地殻の組成に不可欠である. 地域の浸透性は,掘削穴のデータが示唆するよりも高く,古い海洋地殻の流れがチャネル化されていることを示しています.
科学分野:
- 地球科学 地球科学 地球科学
- 海洋学 海洋学 海洋学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 熱水流体循環は,海殻と海洋化学に大きな影響を及ぼします.
- 脊の側面 (地殻 > 1 Myr 古い) の循環は,地質的な時間尺度でかなりの熱と流体フックスを駆動します.
- 海洋地殻の浸透性は,流体の流れの範囲を決定し,熱と化学物質の交換に影響を与えます.
研究 の 目的:
- 海洋地殻の年齢,浸透性,そして流体の流れの間の関係を調査する.
- 掘削孔の浸透度測定と大規模な熱流の観測の間の不一致を調和させるため.
- 大洋の成熟した地殻における熱水循環を制御するメカニズムを理解する.
主な方法:
- 海洋上層の地殻における掘削孔の浸透性測定に関する世界的なデータセットの分析.
- 浸透性の傾向を地震速度のデータと年齢依存の地殻特性と比較.
- 地域規模の浸透性を推定するための横流モデルの開発と適用.
主要な成果:
- 掘削孔の浸透性の測定は,年齢とともに傾向を示し,数百万年以上前の地殻の液体流量の減少を示唆しています.
- この年齢浸透性の傾向は,古い地殻の持続的なアドベクティブ熱損失を示唆する熱流量データと矛盾しているようです.
- 計算によると,地域規模での浸透性は,特に古い地殻の掘削穴の測定値よりも大幅に高いことが明らかになっています.
結論:
- 海洋地殻の熱水流は,岩の体積のわずかな部分を通過している可能性が高い.
- このチャネリングされた流れは,測定された低透度と,古い地殻の地域的な高熱損失を調和させます.
- 流体のコンベクションの幾何学と流体と岩の相互作用の性質は,この集中した流れによって深く影響されています.
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