在回收和同位素之间的定量联系.
Alexander V Sobolev1, Albrecht W Hofmann, Gerhard Brügmann
1V. I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin Street 19, 119991, Moscow, Russia. sobolev@geokhi.ru
Science (New York, N.Y.)
|July 26, 2008
概括
在冰岛回收的海洋地在冰岛回收.
科学领域:
- 地质化学 地质化学
- 同位素地球化学 同位素地球化学
- 石化学 石化学是一门学科.
背景情况:
- 回收的海是地幔来源地区的关键组成部分.
- 之前的研究已经使用了较高的187Os/188Os比率和微量元素成分 (高Ni,低Mn) 来识别回收的地.
- 这些标记物和它们对地幔来源的影响之间的联系仍在争论中.
研究的目的:
- 调查冰岛岩中同位素和微量元素之间的关系.
- 加强回收地对地幔来源的贡献模型.
- 为了估计回收的地和地幔peridotite的同位素组成.
主要方法:
- 来自冰岛的四年纪岩的分析.
- 测量了 (Os) 同位素比率 (187Os/188Os).
- 微量元素分析 (,).
主要成果:
- 证明了冰岛岩中较高的187Os/188Os和高Ni/低Mn含量之间的直接联系.
- 估计了回收的地成分的同位素组成.
- 限制了周周末端成员的组成,使其类似于当今的海洋地幔.
结论:
- 这些发现强化了回收海洋地影响地幔组成的模型.
- 冰岛的岩部分来源于一个古老的地组成部分 (1.11.8亿年前).
- 这项研究提供了对地球地幔长期演变的见解.
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