通过铁石榴石的生长释放氧气 (氧化液体),并在潜水带中循环氧气
Shuguang Song1, Shiting Ye1, Ming Tang1
1SKLab-DeepMinE, MOEKLab-OBCE, School of Earth and Space Science, Peking University, Beijing 100871, China.
Science bulletin
|October 9, 2025
概括
降温区通过在转化过程中释放氧化液体来回收氧气. 这项研究揭示了铁丰富的石榴石在压板块中,为深层地球的氧气循环和大氧气事件提供了洞察力.
科学领域:
- 地质化学 地质化学
- 矿物学是什么?矿物学是什么?
- 石化学 石化学是一门学科.
- 构造学 构造学 构造学 构造学
背景情况:
- 俯冲区在地球的氧气循环中起着至关重要的作用,将表面材料运送到深层地幔.
- 在俯冲区内氧化材料和流体的行为仍然不太清楚.
- 了解深层地幔的氧化还原状态对于破译地球的氧气预算和历史至关重要.
研究的目的:
- 为了研究氧化材料在潜伏过程中的命运.
- 为了确定化铁矿在地球深层氧气循环中的作用.
- 探索富含铁的石榴石对深层地幔氧还原状态和氧循环的影响.
主要方法:
- 从氧化皮性铁石中Fe-Mn石榴石的生长分析.
- 在中国西北方的里安矿床研究高压变态复合物.
- 详细分析了两种富含铁素铁的石榴石 (spessartine和andradite-calderite) 的组成.
主要成果:
- 观察到Fe-Mn石榴石从高度氧化的铁石中生长.
- 两种类型的石榴石,斯佩萨丁和安德拉迪特-卡尔德里特,呈现出高Fe3+含量.
- 石榴石的生长涉及Mn4+和Fe3+的减少,在转化过程中释放氧化液体.
结论:
- 氧化材料的降温导致氧气或氧化液体在高压转化过程中释放.
- 沉浮板中的富含Fe3+的石榴石和血可以持续存在,影响深层地幔的Fe3+含量.
- 这个过程提供了一个在寒冷的降温区循环利用氧气的机制,可能与"大氧气事件"有关.
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