A hidden carbon cycle exists inside Earth. Every year, megatons of carbon disappear into subduction zones, affecting atmospheric carbon dioxide and oxygen over Earth’s history. Here we discuss the processes that move carbon towards subduction zones and transform it into fluids, magmas, volcanic gases and diamonds. The carbon dioxide emitted from arc volcanoes is largely recycled from subducted microfossils, organic remains and carbonate precipitates. The type of carbon input and the efficiency with which carbon is remobilized in the subduction zone vary greatly around the globe, with every convergent margin providing a natural laboratory for tracing subducting carbon.
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This work was supported by the Deep Carbon Observatory. We thank the late E. Hauri, whose leadership and vision put into motion much of the research on carbon reservoirs and fluxes and on volcanic gas and magma chemistry reported here. We thank A. Malinverno, A. Thomson, S. Shirey, O. Tschauener, M. Walter, A. Aiuppa, T. Fischer, E. Cottrell and D. Kent for discussions, and J. M. de Moor and D. Muller for their comments.
The authors declare no competing interests.
Peer review information Nature thanks J. Maarten de Moor, Dietmar Muller and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Fluid-mediated carbon release from serpentinite-hosted carbonates during dehydration of antigorite-serpentinite in subduction zones
Earth and Planetary Science Letters (2019)