10(6)-yr timescales, is tied to that of the deep Earth. Volcanic degassing, weathering, and burial of volatile elements regulates their abundance at the surfac'/> Low oxygen and argon in the Neoproterozoic atmosphere at 815 Ma
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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Low oxygen and argon in the Neoproterozoic atmosphere at 815 Ma
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Low oxygen and argon in the Neoproterozoic atmosphere at 815 Ma

机译：在NeoproteroZoice氛围中低氧气和氩气在815 mA

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The evolution of Earth's atmosphere on >10(6)-yr timescales, is tied to that of the deep Earth. Volcanic degassing, weathering, and burial of volatile elements regulates their abundance at the surface, setting a boundary condition for the biogeochemical cycles that modulate Earth's atmosphere and climate. The atmosphere expresses this interaction through its composition; however, direct measurements of the ancient atmosphere's composition more than a million years ago are notoriously difficult to obtain. Gases trapped in ancient minerals represent a potential archive of the ancient atmosphere, but their fidelity has not been thoroughly evaluated. Both trapping and preservation artifacts may be relevant. Here, I use a multi-element approach to reanalyze recently collected fluid-inclusion data from halites purportedly containing snapshots of the ancient atmosphere as old as 815 Ma. I argue that those samples were affected by the concomitant trapping of air dissolved in brines and contaminations associated with modern air. These artifacts lead to an apparent excess in O-2 and Ar. The samples may also contain signals of mass-dependent fractionation and biogeochemical cycling within the fluid inclusions. After consideration of these artifacts, this new analysis suggests that the Tonian atmosphere was likely low in O-2, containing <= 10% present atmospheric levels (PAL), not similar to 50% PAL as the data would suggest at face value. Low concentrations of O-2 are consistent with other geochemical constraints for this time period and further imply that the majority of Neoproterozoic atmospheric oxygenation occurred after 815 Ma. In addition, the analysis reveals a surprisingly low Tonian Ar inventory-<= 60% PAL-which, if accurate, challenges our understanding of the solid Earth's degassing history. When placed in context with other empirical estimates of paleo-atmospheric Ar, the data imply a period of relatively slow atmospheric Ar accumulation in the Paleo- and Meso-Prot
机译：地球氛围的演变为> 10（6）毫在时间尺寸，与深层的速度相关联。火山岩脱气，风化和埋葬元素的挥发性元素调节其在表面的丰度，为调制地球大气和气候的生物地球化学循环设定边界条件。大气通过其组成表示这种相互作用;然而，古老的大气成分的直接测量超过一百万年前难以获得难以获得。陷入古代矿物质的气体代表了古老的气氛的潜在档案，但他们的忠诚尚未彻底评估。捕获和保存工件都可能是相关的。在这里，我使用多元素方法来重新分析最近收集来自哈尔特的流体包容性数据，据称占古老大气的快照，如815 ma。我认为这些样品受到伴随溶解在与现代空气相关的盐水和污染物中的空气捕获的影响。这些伪影导致O-2和AR中的表观过量。样品还可含有在流体夹杂物内的质量依赖性分级和生物地质化学循环的信号。在考虑这些工件之后，这种新分析表明，O-2的Tonian大气可能很低，含有<= 10％的大气水平（PAL），与50％的PAL类似，因为数据在面值上表达。低浓度的O-2与该时间段的其他地球化学约束一致，进一步意味着在815 mA之后发生大部分奈良罗古代大气氧合。此外，分析揭示了一个令人惊讶的低托尼亚ar库存 - <= 60％的Pal - 如果准确，挑战我们对固体地球脱气历史的理解。当与古大气中的其他经验估计进行古大气压的实证估计时，数据暗示了古和中索 - 科技的相对慢的大气AR累积时期

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