大气中的二氧化碳在埃米山洪水基础岩火山活动期间减少
Jiaheng Shen1, Yi Ge Zhang2, Dong-Xun Yuan3
1School of Earth and Space Sciences, Peking University, Beijing, China. jiahengshen@pku.edu.cn.
Nature communications
|February 26, 2026
概括
大气中的二氧化碳水平在埃米山大火山区 (LIP) 喷发期间下降,与预期相反. 由地升起的强化侵蚀消耗的二氧化碳比火山脱气释放的二氧化碳更多.
科学领域:
- 地质科学是地球科学.
- 古气候学 古气候学
- 火山学 火山学是一门学科.
背景情况:
- 传统模型将大火性地区 (LIP) 与大气二氧化碳增加和生物危机联系在一起.
- 这个模型假设在火山排放过程中二氧化碳的增加,这是需要经验验证的概括.
- 了解LIP对环境的影响对于解释过去的灭绝事件至关重要.
研究的目的:
- 为了重建大气中的二氧化碳变化 (pCO2) 在Emeishan LIP位置 (~260 Ma).
- 为了测试将LIP与二氧化碳度升高联系在一起的传统模型.
- 研究构造-岩层相互作用在调节LIP驱动的环境变化的作用.
主要方法:
- 从叶绿素衍生化合物中使用碳同位素的pCO2变异的重建.
- 旧大气CO2的高分辨率分析.
- 埃米山基岩的地质化学分析,以评估岩中的二氧化碳含量.
主要成果:
- 高分辨率的pCO2记录显示,在早期和主要洪水玄武岩阶段,从700ppm下降到350ppm.
- 在随后的岩喷发中,pCO2增加,与爆发前的地升起相吻合.
- 地化学数据表明,埃米山玄武岩的二氧化碳含量异常低.
结论:
- 由区域升起驱动的长江岩碳酸盐的强化侵蚀和气候变化,可能消耗的二氧化碳比释放的岩石脱气更多.
- LIP的环境影响可能会在主要喷发阶段之前发生,这是由构造-岩相互作用所驱动的.
- 复杂的二氧化碳模式,而不仅仅是火山脱气,影响LIP的环境影响和相关的生物事件.
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