一个由海洋地托管的地质碳循环下沉池,它是talus brecciascias
Rosalind M Coggon1, Elliot J Carter2, Lewis J C Grant1
1School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, UK.
Nature geoscience
|December 11, 2025
概括
海洋地的气候变化在海底岩石中吸收了大量的二氧化碳 (CO2). 在缓慢扩散的山脊上,Talus breccias充当主要的碳汇,可能平衡地形成过程中释放的二氧化碳.
科学领域:
- 地质化学 地质化学
- 海洋地质 海洋地质学
- 碳循环研究 碳循环研究
背景情况:
- 海洋地的气候变化通过海底反应吸收大气中的二氧化碳.
- 这种地碳汇的容量,特别是山脊侧面的容量,量化得很差.
- 了解这种沉对于平衡中洋脊过程中的二氧化碳脱气至关重要.
研究的目的:
- 测量在缓慢扩散的山脊上形成的talus breccias内部的碳沉降.
- 评估骨在长期海洋碳循环中的作用.
- 为了研究传播速率对地碳封存的影响.
主要方法:
- 来自中大西洋山脊的6100万年前的talus breccias的化 (IODP探险队390).
- 对碳酸盐凝固和海水衍生的二氧化碳含量的分析.
- 使用断层几何学方法估计talus breccia的丰度.
主要成果:
- 经过4000万年的凝固,Talus breccias含有约7.5%的海水衍生的二氧化碳,比以前研究的上层地含量高出2-40倍.
- 在缓慢扩散的山脊上形成的塔卢斯可以代表大量的二氧化碳下沉,可能平衡地的二氧化碳释放.
- 塔卢斯的数量随着海底扩散速度的下降而非线性增加.
结论:
- 泰卢斯·布雷克西亚是海洋地中重要的长期碳沉积物.
- 海底扩散速度在调节地球碳循环中二氧化碳释放和吸收之间的平衡方面发挥着至关重要的作用.
- 过去的扩散率变化可能影响了全球碳动态.
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