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在Mauna Loa岩的源头内观察到的"幽灵流体"中的回收海洋地

Sobolev¹, Hofmann, Nikogosian

¹Max-Planck-Institut fur Chemie, Mainz, Germany. asobolev@mpch-mainz.mpg.de

|May 9, 2000

概括

地幔羽毛可能携带着古代海洋地. 来自毛纳罗阿山的新证据显示,融化的含有跟踪元素的标志,与回收的加布洛岩石相匹配,这表明被压缩的海洋地被纳入地幔羽毛.

科学领域:

地质化学地质化学
石化学石化学是一门学科.
地力学是什么?地力学是什么?

背景情况:

人们认为地幔羽毛将物质从地球内部运送到地表.
在地幔羽毛中存在循环海洋地是一种被广泛接受的假设.
此前曾有人建议夏威夷羽毛的来源成分包括回收的海洋玄武岩,海底沉积物或海洋布.

研究的目的:

为了调查夏威夷地幔羽毛中的特定成分的起源.
为了确定被纳入羽毛的回收海洋地的特定类型.
了解回收地材料的化学特征的保存.

主要方法:

在Mauna Loa橄树内融化的含量中分析主要和微量元素.
在融化含物中的微量元素模式与已知的ophiolitic gabbros和海洋地的组成进行比较.
对主要元素组成的评估,以排除当今海洋地的同化.

主要成果:

在Mauna Loa的橄树中发现了异国情调的,富含的融.
这些含的微量元素图案与ophiolites中的分层gabbros非常相似.
主要元素的组成表明,这些含有物并非来自于现代海洋地的同化.

结论:

已识别的融化含物代表了经过再循环的海洋gabbro,通过俯冲转化为生态石.
这种生态石后来被纳入了夏威夷地幔羽毛.
一个"幽灵血流"的微量元素签名允许识别回收的gabbro,证明其化学身份可以通过地幔对流保持.

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