海水の沈殿は,マントルの重貴気体の組成を制御する
Greg Holland1, Chris J Ballentine
1School of Earth, Atmosphere and Environmental Sciences, The University of Manchester, Oxford Road, Manchester M13 9PL, UK. g.holland@manchester.ac.uk
Nature
|May 12, 2006
まとめ
地球のマントルの高貴なガスは,惑星の揮発性の獲得の秘密を明らかにします. 海水と沈殿物の潜水は,海水と沈殿物の潜水ではない.
科学分野:
- *地化学と惑星科学
背景:
- *地球のマントルの揮発性成分は,惑星の形成と進化のヒントを提供します.
- * マントルの貴気体 (He, Ne, Ar, Kr, Xe) は,太陽,大気,放射性源に関連した同位体組成を有する.
- *以前の研究では,大気と地殻の汚染に対するマントルの貴金属ガスを修正しました.
研究 の 目的:
- *地球マントルの重貴ガス (Ar,Kr,Xe) の起源を調査する.
- *高貴ガス"潜水障壁"の仮説を検証する.
- * マントルの貴気体と水の元素と同位体組成を説明するために.
主な方法:
- * マントルから派生したマグマ質CO2ガスにおける貴金属ガスの元素および同位体組成の分析.
- *大気,地下水,地殻からの貴重ガスへの貢献度による補正.
- * 掘削による高貴ガスと水のリサイクルモデリング.
主要な成果:
- * マントルの非放射性重貴気体は,海水と基本的な類似性を示しています.
- *海水の影響を受けた堆積物の潜水により,マントルのほとんどの非放射性Ar,Kr,XEが説明される.
- *マントルの水分含有量の約50%は潜水による.
- * 沈殿した材料の強化されたリサイクルが,羽根から派生した玄武岩の変動を説明しています.
結論:
- *高貴ガスの"潜水障壁"という概念に異議を唱える.
- *沈殿物と海水の潜水は,マントルの高貴ガス組成を制御する主要なメカニズムである.
- * このプロセスはマントルの水分に大きく貢献し,マントルの羽根の組成に影響を与えます.
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