リサイクルされた脱水石層は,羽根の影響を受けた海中の玄武岩で観察されました
Jacqueline Eaby Dixon1, Loretta Leist, Charles Langmuir
1RSMAS/MGG, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149, USA. jdixon@rsmas.miami.edu
Nature
|December 3, 2002
まとめ
地球の奥深くに水の循環は不確実である. この研究は,潜水が海洋の石層から水を効率的に抽出することを示しており,その過程で92%以上が除去されています.
科学分野:
- 地質化学 地質化学
- 地質学 地質学 地質学
- 地球科学 地球科学 地球科学
背景:
- 地球規模の地球化学的水循環は,特に水の深層マントルの循環は,ほとんど理解されていません.
- 水分化された海洋石層の潜水は,地球深層への水輸送の重要な,しかし不確実な経路です.
研究 の 目的:
- 深層マントルの水循環の効率を調査する.
- バザルトを用いてマントルの異なる構成要素の揮発性物質の含有量を特徴付ける.
主な方法:
- 海洋島の玄武岩 (OIBs) と海中の玄武岩 (MORBs) の揮発性含有量に関する分析.
- 異なるマントル源に関連するOIBの水分含有量の比較,潜水石層 (EM型) を含む.
主要な成果:
- 海洋島の玄武岩は,一般的には,中海のの玄武岩よりも多くの水を含んでいます.
- 浸層された石層を含む濃縮マントル (EM型) 構成要素に関連したバサルトは,一般的なマントル源と比較して水分の減少を示しています.
- これは,潜水中の効率的な水の抽出を示唆しています.
結論:
- サブドクションプロセスは,海底の石層から水を抽出するのに非常に効率的です (>92%).
- この研究は,地球のマントル内の水輸送とリサイクルを管理するメカニズムに関する重要な洞察を提供します.
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