近日，中国海洋大学李三忠团队研究了马里亚纳型俯冲带还原-氧化收支对地幔氧化的影响。相关论文于2026年3月4日发表在《自然—地球科学》杂志上。
俯冲作用将氧化物质输送到地球内部。马里亚纳俯冲带是现代板块构造体制的典型代表，提供了全面的地质、地球化学和地球动力学数据。
研究组采用热力学-热动力数值方法，沿马里亚纳型俯冲带设置进行二维氧化还原动力学模拟及流体-熔体释放过程重建，从而实现数值模型与马里亚纳弧长期氧化事件的对比。研究组揭示了俯冲带地幔氧化的两种主要机制：首先，俯冲过程中的硫化物氧化使流体能够携带大量氧化还原预算进入弧下地幔，其中部分水化地幔是主要流体贡献者，其次为蚀变洋壳；其次，从板顶沉积物和蚀变洋壳中提取的富铁（Fe3+）氧化熔体对弧后地幔氧化起主导作用。
大部分氧化物质随俯冲板块进入深部地幔。研究表明，随着现代板块构造的出现和高效岩石圈循环，马里亚纳型俯冲带携带的氧化物质对地球地幔氧化还原演化及地球氧化过程产生了全球性影响。
附：英文原文
Title: Mantle oxidation influenced by reduction-oxidation budget of Mariana-type subduction zones
Author: Duan, Wen-Yong, Connolly, James A. D., van Keken, Peter E., Gerya, Taras, Schertl, Hans-Peter, Willner, Arne P., Li, Xu-Ping, Li, San-Zhong
Issue&Volume: 2026-03-04
Abstract: Subduction transports oxidized material into Earth’s interior. The Mariana subduction zone is a representative example of modern plate tectonic regimes and provides a comprehensive set of geological, geochemical and geodynamical data. Here we use thermomechanical–thermodynamic numerical methods to simulate redox dynamics and fluid-melt release along a Mariana-type subduction setting in two dimensions, allowing comparison between our model and long-term oxidation events in the Mariana arc. Our findings demonstrate two main mechanisms of subduction-related mantle oxidation. First, sulfide oxidation during subduction enables fluids to carry substantial redox budgets into the sub-arc mantle. Partially hydrated mantle emerges as the primary fluid contributor, followed by altered oceanic crust. Secondly, oxidized iron-rich (Fe3+) partial melts extracted from slab-top sediments and altered oceanic crust exert a dominant influence on back-arc mantle oxidation. The majority of oxidized material is carried into the deeper mantle with subducted slabs. Our work demonstrates that with the advent of modern plate tectonics and efficient lithospheric recycling, oxidized material carried by Mariana-type subduction zones has had a global impact on Earth’s mantle redox evolution and our planet’s oxygenation.
DOI: 10.1038/s41561-026-01939-w
Source: https://www.nature.com/articles/s41561-026-01939-w