刚开始的大陆形成是由一个改变的地图原地的浅融
Michael I H Hartnady1, Simon Schorn2,3, Tim E Johnson4
1Timescales of Mineral Systems Group, Curtin Frontier Institute for Geoscience Solutions, School of Earth and Planetary Science, Curtin University, Perth, WA, Australia. michael.hartnady@curtin.edu.au.
Nature communications
|May 16, 2025
概括
来自澳大利亚的古老岩石揭示了早期的地球.
科学领域:
- 地质科学,岩石学,地质年代学.
- 考古伊翁地质地质学
- 早期的地球动力学
背景情况:
- 了解古代大陆核的形成是早期地球地力学的关键.
- 保存早期地球过程证据的古老岩石很少见.
- 地球早期原地的性质及其转变仍然不太清楚.
研究的目的:
- 为了研究地球最早的大陆地的形成.
- 了解原地变化的机制.
- 为了从罕见的古老岩层中提供新的石油学证据.
主要方法:
- 发现和分析来自西澳大利亚皮尔巴拉克拉顿的化式两岩.
- 石和石的放射测年法限制了部分化的时间.
- 热力学建模以确定融条件和埋葬深度.
- 稳定同位素 (δ18O) 和融成分的分析.
主要成果:
- 在3565万年前发生的部分融化事件,比大多数暴露的Pilbara Craton岩石更早.
- 确定了低δ18O的组成和模拟的融化组成,类似于Hadean岩石.
- 热力学建模表明,在680-720°C和0.8-1.0 GPa时部分化.
- 估计最大埋葬深度约为30公里.
结论:
- 这些发现支持了通过浅部部分融化形成大陆核的模型.
- 建议在高热流环境中水热改变的地形原地作为来源.
- 提供了证据表明,地球最古老的大陆地可能来源于与海底岩石相似的组成岩石.
- 突出了罕见的古代岩石发现对了解早期地球的重要性.
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