Earth's Great Oxidation Event facilitated by the rise of sedimentary phosphorus recycling
Earth's Great Oxidation Event facilitated by the rise of sedimentary phosphorus recycling
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DOI：
10.1038/s41561-022-00906-5
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发表时间：
2022-03-01
影响因子：
18.3
通讯作者：
Poulton, Simon W.
中科院分区：
文献类型：
--
作者：
Alcott, Lewis J.;Mills, Benjamin J. W.;Poulton, Simon W.
在大约24亿年前的大氧化事件期间，大气中氧气的增加是全球地球化学循环和地球生命演变的一个决定性转变。然而，温和的氧化大陆风化和海洋氧绿洲的发展发生在几亿年前的大氧化事件。因此，大氧化事件代表了一个临界点，初级生产力和O-2生产压倒了消耗O-2的还原物种的输入，其时间由主要限制营养素磷酸盐的输入和固体地球的动力学决定。在这里，我们确定了2.65至24.3亿岁的钻芯样品从德兰士瓦超群，南非的磷相分配，调查的事件，促进持久的大气氧化的顺序。基于硫化物沉积物中发现的C/P比相对于雷德菲尔德比升高，我们认为，由于氧化大陆风化增加了溶解硫酸盐的流入，从而增加了海洋中溶解的硫化物，生物可利用的磷因缺氧而变得更加丰富沉积磷相的再循环。生物地球化学模型表明，这引发了对初级生产力的正反馈，并表明磷再循环的演变可能是使地球过渡到持续含氧大气的关键步骤。根据对太古代钻孔岩芯样本和生物地球化学模型的分析，海洋硫化物可用性增加驱动的沉积磷再循环有助于地球大气的持续氧化
The rise of atmospheric oxygen during the Great Oxidation Event some 2.4 billion years ago was a defining transition in the evolution of global biogeochemical cycles and life on Earth. However, mild oxidative continental weathering and the development of ocean oxygen oases occurred several hundred million years before the Great Oxidation Event. The Great Oxidation Event thus represents a tipping point, whereby primary productivity and O-2 production overwhelmed the input of reduced species that consume O-2, and its timing is determined by the input of phosphate, the major limiting nutrient, and the dynamics of the solid Earth. Here, we determine the phase partitioning of phosphorus in 2.65 to 2.43 billion year old drill core samples from the Transvaal Supergroup, South Africa, to investigate the sequence of events that facilitated persistent atmospheric oxygenation. On the basis of the elevated C/P ratios found within sulfidic sediments, relative to the Redfield ratio, we suggest that, as oxidative continental weathering increased the influx of dissolved sulfate and hence dissolved sulfide in the oceans, bioavailable phosphorus became more abundant due to anoxic recycling of sedimentary phosphorus phases. Biogeochemical modelling indicates that this initiated a positive feedback on primary productivity and shows that the evolution of phosphorus recycling may have been a critical step that enabled Earth's transition to a persistently oxygenated atmosphere.Recycling of sedimentary phosphorus driven by increasing oceanic sulfide availability contributed to the persistent oxygenation of Earth's atmosphere, according to analysis of Archean drill-core samples and biogeochemical modelling