Nitrogen is the main elemental constituent of Earth's atmosphere, but the deep Earth cycle of nitrogen is enigmatic because the speciation of nitrogen in the mantle has not been well constrained. Xenoliths from Earth's upper mantle contain small amounts of nitrogen: from a few parts per million in the depleted sub-ridge mantle to nearly 100 ppm in mantle-enriched domains formed by the recycling of organic materials transported to the deep mantle by subduction. It has been also suggested that the redox conditions in the mantle wedge resulting from subduction favor the development of the nitrogen-enriched atmosphere of the Earth (...

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