来自海洋岛屿玄武岩的融化含量中的Pb同位素变异性,波利尼西亚
1A. E. Saal, S. R. Hart, N. Shimizu, G. D. Layne, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. E. H. Hauri, Department of Terrestrial Magnetism, Carnegie Institution of Washington,
概括
在玄武岩融化的含量中微量元素的变化与岩混合有关,而不仅仅是融化. 这项研究揭示了包括在内的多种同位素组成,这表明火山系统中的多个岩来源.
科学领域:
- 地质化学 地质化学
- 石化学 石化学是一门学科.
- 火山学 火山学是一门学科.
背景情况:
- 在玄武岩融入物中微量元素的变化往往归因于融过程.
- 海洋岛基岩 (OIB) 提供了对地幔异质性和岩演变的见解.
研究的目的:
- 为了研究微量元素的起源和同位素异质性,在奥利文托管的玄武岩融收录.
- 为了确定融化过程或岩混合是否导致观察到的变化.
主要方法:
- 在Mangaia和Tahaa,库克群岛和社会群岛分别的融化中分析 (Pb) 同位素组成.
- 应用双组分混合模型来解释同位素数据.
主要成果:
- 融化含物呈现异质的Pb同位素组成,与均的喷发岩形成鲜明对比.
- 在单个融化含物中,Pb同位素组成的范围很大,覆盖了全球OIB范围的50%.
- 数据与每个岛屿的两部分混合模型一致.
结论:
- 岩混合,而不是仅仅是融过程,是产生基岩融含物中微量元素变化的重要因素.
- 在融化聚合之前或在融化聚合期间,在火山管道系统中可能共存着同位素上不同的岩石.
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