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Schematic diagram showing the deep nitrogen flux of global sediments that pass through the sub-arc depth (~4.5 x 10 8 kg/y) and the phengite to K-hollandite transition depth (~1.5 x 10 8 kg/y). The nitrogen degassing flux (~1.15 x 10 5 kg/y) from the lower mantle is from ref. 85. See the main text for more details. Source data are provided in Supplementary Data 2.

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