FeO2 and FeOOH under deep lower-mantle conditions and Earth’s oxygen–hydrogen cycles

Qingyang Hu, Duck Young Kim, Wenge Yang, Liuxiang Yang, Yue Meng, Li Zhang and Ho-Kwang Mao ()
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Qingyang Hu: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Duck Young Kim: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Wenge Yang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Liuxiang Yang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Yue Meng: High Pressure Collaborative Access Team (HPCAT), Geophysical Laboratory, Carnegie Institution
Li Zhang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Ho-Kwang Mao: Center for High Pressure Science and Technology Advanced Research (HPSTAR)

Nature, 2016, vol. 534, issue 7606, 241-244

Abstract: First-principles calculations and experiments are used to identify a stable, pyrite-structured iron oxide at 76 gigapascals and 1,800 kelvin that holds an excessive amount of oxygen and to show that goethite (rust) decomposes under these deep lower-mantle conditions to form an iron oxide and release hydrogen; this process provides another way to interpret the origin of seismic and geochemical anomalies in the deep lower mantle of Earth.

Date: 2016
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DOI: 10.1038/nature18018

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