| 柳晓丹,赵正鹏,张子虎.铁组分对早期海洋化学演化的指示[J].贵州地质,2021,38(4):398-404 |
| 铁组分对早期海洋化学演化的指示 |
| Indicator of Iron Speciation for the Chemical Evolution of Ancient Oceans |
| 投稿时间：2021-06-05 |
| DOI： |
| 中文关键词: 铁组分 氧气 BIF 硫酸盐 分层海洋化学结构 |
| 英文关键词:Iron speciation Oxygen BIF Sulfate Redox stratification |
| 基金项目:国家自然科学基金项目(编号:42002027)，莱州-莱西一带矿集区生态修复支撑调查(编号:DD20208080)资助。 |
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| 中文摘要: |
| 地球表生环境在地质历史时期经历了剧烈的波动，为当前建设宜居地球提供了重要参照。铁组分是重建古海洋氧化还原状态演化的重要指标，但现有的研究集中于FeHR/FeT和Fepy/FeHR两个比值的应用，而对其中不同组分所携带的信息缺少深入的挖掘。本研究统计了已发表的、泥盆纪之前的、采用程序萃取方法获得的铁组分数据，对其中不同的组分所可能指示的海洋化学信息进行了研究。我们发现氧化环境中氧化铁的含量有可能用于追踪长周期上大气-海洋系统的氧含量波动、总铁含量与海洋中铁的含量密切相关、铁化环境中黄铁矿铁的含量对海洋硫酸盐库大小的演化有很好的响应。我们的工作表明，铁组分指标是指示海洋局部氧化还原状态的强大指标，其不同的组分与海洋中氧气、碳和硫酸盐等存在极强的交互过程，可以被用来重建海洋的化学演化。 |
| 英文摘要: |
| The environment of the Earth’s surface experienced dramatic fluctuations in geological times, providing an important reference for the construction of a habitable Earth. The iron speciation has been widely used as a proxy for the reconstruction of redox conditions in ancient oceans. However, most studies focus on the use of the ratios of FeHR/FeT and Fepy/FeHR, but neglect the possible informations carried by different iron species in the sediments. In this study, we compiled published data analyzed using the sequential extraction method before the Devonian, and explored the possible implication of special iron specie for the chemical state in ancient oceans. We found Feoxic in oxic water conditon could be used to track the oxygen level in the atmosphere-ocean system, FeT in the sediment was closely related to the iron reservoir size in the seawater, and Fepy in ferruginous environment might reflect the secular change of sulfate in the ocean. Our study indicates that while the iron speciation proxy can provide important informations of local water redox conditions, its different species are closely related to oxygen, carbon and sulfate cycling in the ocean, and can be used to track the secular evolution of the seawater chemistry. |
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