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Although oxygen is the most abundant anion in Earth\u2019s silicate interior, its role in magma is conventionally ignored, with magma oxygen contents assumed to be simply fixed by cation stoichiometry. Here we show, using high-pressure and high-temperature experiments supported by molecular dynamics simulations, that silicate magma can incorporate substantially more oxygen than permitted by traditional valence-state constraints. Excess oxygen acts as a previously unrecognized volatile component, increasing in concentration from near zero at 1 atm to &amp;gt; \u223c5\u00a0wt.% above 5\u00a0GPa, more than five times the maximum oxygen increase attainable in Earth\u2019s solid mantle through iron redox changes. As oxygen-rich magmas ascend and decompress, their capacity to retain excess oxygen decreases, driving the release of O2. This behaviour provides a direct mechanism with the potential to link mantle melting to oxidation of Earth\u2019s shallow interior and atmosphere, and identifies magma as a dynamic reservoir in planetary oxygen cycles.<\/jats:p>","DOI":"10.1093\/nsr\/nwag539","type":"journal-article","created":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T11:42:50Z","timestamp":1787658170000},"source":"Crossref","is-referenced-by-count":0,"title":["Magma as a carrier of non-stoichiometric oxygen linking Earth\u2019s interior and atmosphere"],"prefix":"10.1093","volume":"13","author":[{"given":"Yongjiang","family":"Xu","sequence":"first","affiliation":[{"name":"Center for High Pressure Science and Technology Advanced Research , Beijing 100193 ,","place":["China"]},{"name":"Lin Earth and Planetary Laboratory, Center for High Pressure Science and Technology Advanced Research , Beijing 100193 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