原始的な中海玄武岩の蒸気不飽和と,地球の上層マントルの揮発性物質の含有量
Alberto E Saal1, Erik H Hauri, Charles H Langmuir
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA. asaal@ldeo.columbia.edu
Nature
|October 9, 2002
まとめ
この研究では,海中の玄武岩の噴火前の揮発性物質の含有量を分析し,地球に関する新しい洞察を明らかにしました.
科学分野:
- 地質化学 地質化学
- 火山学 火山学とは
- 地球科学 地球科学 地球科学
背景:
- 磁気系における揮発性分析は,地球のマントルの組成と,海洋と大気化学に対する磁気脱ガス効果を明らかにする.
- 噴火したラバのほとんどは大気圧で脱ガスされ,マグマの溶解性が低いため,主要な揮発性シグネチャを失います.
研究 の 目的:
- シケイロス内部変異拡散センターからの海中の玄武岩の不飽和の噴火前の揮発性物質の含有量を決定する.
- 上層マントル内の揮発性の豊富さと行動に新しい制約を確立する.
主な方法:
- 海洋中部の玄武岩の一連の揮発性物質含有量の分析.
- 低飽和マグマにおける揮発性および耐火性微量元素の相関を調査する.
主要な成果:
- シケイロスの海中の玄武岩の噴火前の不飽和の揮発性物質含有量について報告.
- 普通の海中の玄武岩源における二酸化炭素,水,フッ素,硫黄,塩素の豊富さに新しい制約を設けました.
- 原始的な二酸化炭素と塩素を推定するために,二酸化炭素の行動とCO2 / NbとCO2 / Clの比率を活用した.
結論:
- 噴火前のマグマの不飽和は,主要な揮発性シグネチャーの保存を可能にします.
- データは,マントルの揮発性物質の含有量と行動の改善された見積もりを提供します.
- 波動性分析による中海の山脊の制限された脱ガスと汚染の歴史.
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