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Earth's atmosphere contains 27–30% of the planet's nitrogen and recent estimates are that about one-half that amount (11–16%) is located in the continental and oceanic crust combined. The percentage of N in the mantle is more difficult to estimate, but it is thought to be near 60%, at very low concentrations. Knowledge of the behavior of N in various fluid-melt-rock settings is key to understanding pathways for its transfer among the major solid Earth reservoirs.

Pathways for nitrogen cycling in Earth's crust and upper mantle: A review and new results for microporous beryl and cordierite