在过去的20亿年里,地球表面Mg循环的演变
Zhiguang Xia1,2,3,4, Shilei Li2,5, Zhongya Hu1,6
1State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China.
Science advances
|March 1, 2024
概括
同位素记录显示,石头石的净埋葬量下降了20亿年,影响了地球的气候. 这项研究将多洛石的气候变化和埋葬周期与长期气候演变联系起来.
科学领域:
- 地质化学 地质化学
- 古气候学 古气候学
- 同位素地球化学 同位素地球化学
背景情况:
- 表面 (Mg) 循环与全球碳循环密切相关,这是地球气候的关键驱动因素.
- 了解周期的长期演变对于重建过去的气候动态至关重要.
- 海水的同位素特征 (δ26Mgsw) 作为追踪表面Mg循环的代理.
研究的目的:
- 为了重建海水 δ26Mgsw 在过去20亿年的演变.
- 调查净石埋葬 (NDB) 的长期趋势及其与地球气候的关系.
- 在地质时间尺度上阐明多洛石化-埋葬周期与气候变化之间的联系.
主要方法:
- 从海洋酸盐液体含量和沉积 dolostones 的同位素组成 (δ26Mgsw) 的分析.
- 在过去20亿年的 δ26Mgsw 演变的重建.
- 质量平衡计算以确定净石埋葬的变化.
主要成果:
- 海水 δ26Mgsw 从古新生代到现在,显著下降了约1.4‰,出现了显著的波动.
- 质量平衡计算表明,在过去20亿年中,净石埋葬 (NDB) 的长期下降.
- 这种NDB的下降归因于海洋的dolomitization减少和大陆的dolostone风化增加.
结论:
- 这项研究为海水 δ26Mgsw 提供了新的 20 亿年记录,为 Mg 循环的演变提供了见解.
- 已经确定了净石埋葬的长期显著下降,这是由于海洋和大陆过程的变化造成的.
- 这些发现突出了多洛石化-埋葬周期与地球在地质时间上的气候调节之间的以前被低估的联系.
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