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Disorders of Erythrocytes
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アビッサル・ペリドータイトにおけるイン・シトゥー・オス・イソトープは,MORBとそれらの源地マントルの間のイソトープの隙間を埋めます
Olivier Alard1, Ambre Luguet, Norman J Pearson
1GEMOC ARC National Key Centre, School of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia. o.alard@open.ac.uk
Nature
|August 19, 2005
まとめ
アビッサル・ペリドータイトと海中の玄武岩 (MORBs) はオスミウムの同位体均衡を示し,以前の仮定に異議を唱える. 海水 海水 海水
科学分野:
- 地質化学 地質化学
- 同位体地質学とは,同位体地質学である.
- マントル・ペトロロジー マントル・ペトロロジー
背景:
- アビッサル・ペリドータイトは,海中の玄武岩 (MORBs) のマントルの残留物と考えられています.
- オスミウムの同位体組成は,アビッサル・ペリドータイトとMORBの間で,歴史的に均衡の欠如を示唆しています.
- この不均衡感はしばしば海水のオスミウム汚染に起因し,データフィルタリングにつながった.
研究 の 目的:
- アビサルのペリドータイトの主要なオスミウム同位体組成を調べるために.
- アビッサル・ペリドータイトとMORBsとの共遺伝関係を再評価する.
- アビサルのペリドータイトにおけるオスミウム系学に対する海水の影響の範囲を決定する.
主な方法:
- オスミウムの主要な媒介体であるマグマ硫化物の詳細な研究,アビッサル・ペリドータイト.
- これらの硫化物におけるオスミウムの同位体組成 (187Os/188Os比) の分析.
- 同位体データと既知のMORB組成物の比較.
主要な成果:
- マグマ硫化物のオスミウム同位体比は,メインマントルの起源である.
- 放射性187Os/188Os値が観察され,MORB.と潜在的な均衡を示した.
- オスミウム体系学に対する海水汚染の影響は過大評価されていることが判明しました.
結論:
- MORBsとアビッサル・ペリドータイトの間には有意なオスミウム同位体ギャップはありません.
- アビッサル・ペリドータイトとMORBは,おそらく共遺伝的関係を共有しています.
- マントルの貯水池を理解するためには,データフィルタリング基準の再評価が必要である.
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