局部变化的条件对大陆地幔碳储存和释放的影响
Stephen F Foley1,2, Chunfei Chen1,3, Dorrit E Jacob2
1School of Natural Sciences, Macquarie University, North Ryde 2109, New South Wales, Australia.
National science review
|June 27, 2024
概括
地幔碳排放量高于此前的估计,而羽毛贡献可能被高估. 岩石类型的局部变化和氧化显著影响碳的储存和释放,挑战全球地幔模型.
科学领域:
- 地质化学 地质化学
- 地质物理学 地质物理学
- 石化学 石化学是一门学科.
背景情况:
- 全球碳预算模型通常依赖于关于地幔过程的简化假设.
- 以前的估计可能过高估计了从羽毛的碳输入,并低估了地幔逐渐脱气.
- 了解地幔组成和氧化还原状态的局部变化对于准确的碳循环建模至关重要.
研究的目的:
- 修订地幔碳排气估计.
- 研究岩石类型和氧化状态的局部变化对碳储存和释放的影响.
- 通过结合小规模地幔过程来完善地球碳循环的模型.
主要方法:
- 对岩石和融化相互作用的高压实验数据的分析.
- 解释稳定同位素系统 (例如,Mg,Zn,Ca) 以确定融过程.
- 地质观测与地球物理信号的整合.
主要成果:
- 渐进的地幔脱气比以前估计的贡献更多的碳;羽毛贡献可能被高估.
- 岩石类型和氧化状态的局部变化强烈影响碳储存和释放机制.
- 富含碳酸盐的融物是通过俯冲和化层融化而形成的,通过氧化还原结或堤捕获碳.
- 裂下的边缘驱动的对流和横向向流通过融化和氧化释放碳,解释了石边缘和岩石之间的关联.
结论:
- 全球地幔组成和氧化状态的平均值不足以理解小规模的碳过程.
- 未来的研究必须侧重于局部变化及其与地球物理数据的整合,以改进碳预算模型.
- 对地幔碳循环的修订理解需要向本地化基于过程的建模转变.
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