缺少的和大陆地的组成由同位素推断出来
Yamei Tian1,2, Feng Huang3,4, Jifeng Xu5,6
1School of Earth Science and Resources, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, China.
Nature communications
|December 18, 2025
概括
(Mo) 同位素数据显示,大陆地的重量超过了大量的酸盐地球. 这一发现有助于平衡地球地球.
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
- 地球科学 地球科学 地球科学
背景情况:
- 在地球主要储库中限制 (Mo) 同位素组成 (δ98/95Mo) 对于理解行星进化至关重要.
- 大陆地 (CC) 的 δ98/95Mo,特别是中间和下部部分,还不太清楚.
研究的目的:
- 为了限制大陆地内的同位素变异性.
- 为了确定大陆地大部分的平均δ98/95Mo.
- 为了评估大陆地和枯竭的地幔之间的Mo同位素平衡.
主要方法:
- 分析了来自河弧段的Mo同位素数据,以及各种地入侵的已公布数据 (超-,中级,).
- 使用多个地深度模型进行质量平衡计算的应用.
- 全球规模的质量平衡建模,以评估地球水库之间的Mo同位素交换.
主要成果:
- 大陆地大部分的平均δ98/95Mo计算为-0.116 ± 0.011‰ (2s.d. ) 显著比大部分的酸盐地球更重.
- 发现大陆地和枯竭的地幔的Mo同位素组成在全球范围内几乎保持平衡.
- 下层地分层被确定为影响枯竭地幔Mo同位素组成的潜在机制.
结论:
- 大陆地具有明显的Mo同位素签名,比大部分的酸盐地球更重.
- 地球的Mo同位素储备,特别是大陆地和枯竭的地幔,目前处于接近平衡的状态.
- 在地球历史上,地的生长和破坏过程一直保持着动态平衡,影响Mo同位素的分布.
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