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相关实验视频

Updated: Jan 6, 2026

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在百慕大群岛下方富含挥发物质的过渡区采样

Sarah E Mazza1, Esteban Gazel2, Michael Bizimis3

  • 1Institute for Planetology, University of Münster, Münster, Germany. smazza@smith.edu.

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|May 17, 2019
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概括

科学家在百慕大发现了一个独特的地幔储存库, 这一发现表明地幔最近回收到过渡区,挑战了关于深地幔来源的先前假设.

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科学领域:

  • 地质化学
  • 地幔岩石学
  • 同位素地化学

背景情况:

  • 内部岩层的岩层省份提供了关于地球地幔的组成和异质性的见解.
  • 地幔异质性往往与挥发性物质和不兼容元素的潜水驱动回收有关.
  • 虽然有些内部火山利用深层地幔的来源,但较浅的水库也会产生岩.

研究的目的:

  • 为了调查由百慕大采集的以前未经记录的地幔区域的组成和起源.
  • 描述这个地幔储存的独特的同位素特征和挥发性含量.
  • 探索地幔回收和极端同位素域的形成的影响.

主要方法:

  • 高精度的同位素比率测量 (Pb,Sr,Nd,Hf) 喷发的岩.
  • 地质化学分析不和的化物.
  • 地力学建模以了解地幔流量和水库采样.

主要成果:

  • 百慕大采集了极端放射性206Pb/204Pb同位素 (19.9-21.7) 和低207Pb/204Pb比率 (15.5-15.6) 的地幔区域.
  • 该储库富含不兼容的元素和挥发性物质,具有不变的Sr,Nd和Hf同位素,表明其年龄小于6.5亿年.
  • 证据表明在地幔过渡区有一个短暂的储存库, 可能涉及K-holandite等矿物质.

结论:

  • 百慕大源是一个新的,最近回收的地幔储存库在过渡区.
  • 潘基亚形成期间发生的潜水事件可能有助于水库的形成和大西洋特有的发生.
  • 地化学证据表明过渡区储存在产生极端同位素域中的作用,此前仅归因于深度回收.