前寒武纪期间陆壳氮的长期增加
A secular increase in continental crust nitrogen during the Precambrian
摘要：
最近的研究表明，在地幔和陆壳中存在大量的地质氮储层。重要的是，随着时间的推移，这种地质氮在大气和固体地球之间进行了交换。大气氮（即大气质量）的变化对气候和生物生产力有直接影响。然而，很难限制主要氮储层随时间的演变。在这里，我们显示了一个长期的增加陆壳氮通过地球历史记录在冰川冰碛（2.9 Ga到现代），这作为一个代理平均上陆壳组成。太古代和最早的古元古代冰碛物含有66 $\pm$ 100 ppm的氮，而新元古代和古元古代冰碛物含有290 $\pm$ 165 ppm的氮，而同位素组成保持恒定，约为4 $\permil$。随着时间的推移，氮在陆壳中积累，可能通过生物固定与大气隔离。我们的研究结果支持动态，非稳态行为的氮通过时间，并与净转移的大气氮地质水库随着时间的推移是一致的。
英文摘要：
Recent work indicates the presence of substantial geologic nitrogen reservoirs in the mantle and continental crust. Importantly, this geologic nitrogen has exchanged between the atmosphere and the solid Earth over time. Changes in atmospheric nitrogen (i.e. atmospheric mass) have direct effects on climate and biological productivity. It is difficult to constrain, however, the evolution of the major nitrogen reservoirs through time. Here we show a secular increase in continental crust nitrogen through Earth history recorded in glacial tills (2.9 Ga to modern), which act as a proxy for average upper continental crust composition. Archean and earliest Palaeoproterozoic tills contain 66 $\pm$ 100 ppm nitrogen, whereas Neoproterozoic and Phanerozoic tills contain 290 $\pm$ 165 ppm nitrogen, whilst the isotopic composition has remained constant at ~4$\permil$. Nitrogen has accumulated in the continental crust through time, likely sequestered from the atmosphere via biological fixation. Our findings support dynamic, non-steady state behaviour of nitrogen through time, and are consistent with net transfer of atmospheric N to geologic reservoirs over time.
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