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首页> 外文期刊>Geobiology >A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic
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A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic

机译：Neoprotero杂志中CR氧化还原循环的古醇记录和CR氧化还原循环的演变和逐步增加大气氧气

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Atmospheric oxygen levels control the oxidative side of key biogeochemical cycles and place limits on the development of high-energy metabolisms. Understanding Earth's oxygenation is thus critical to developing a clearer picture of Earth's long-term evolution. However, there is currently vigorous debate about even basic aspects of the timing and pattern of the rise of oxygen. Chemical weathering in the terrestrial environment occurs in contact with the atmosphere, making paleosols potentially ideal archives to track the history of atmospheric O-2 levels. Here we present stable chromium isotope data from multiple paleosols that offer snapshots of Earth surface conditions over the last three billion years. The results indicate a secular shift in the oxidative capacity of Earth's surface in the Neoproterozoic and suggest low atmospheric oxygen levels (pO(2)) through the majority of Earth's history. The paleosol record also shows that localized Cr oxidation may have begun as early as the Archean, but efficient, modern-like transport of hexavalent Cr under an O-2-rich atmosphere did not become common until the Neoproterozoic.
机译：大气氧水平控制关键生物地球化学循环的氧化侧，并对高能代谢的发展进行限制。因此，了解地球的氧合对地球长期演化的更清晰的图像来说是至关重要的。然而，目前甚至存在氧气崛起的时机的基本方面的有力争论。陆地环境中的化学风化发生在与大气接触中，使古溶解潜在的理想档案，以跟踪大气O-2水平的历史。在这里，我们呈现来自多个古溶剂的稳定铬同位素数据，在过去的三亿年内提供地球表面条件的快照。结果表明，通过大多数地球历史，地球表面的氧化能力下降了地球表面的氧化能力。古世界醇记录还表明，本地化的CR氧化可能已经早起，早在ASCHEAN，但六价CR的高效运输在O-2丰富的气氛下，直到NeoProterozoice直到常见。

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