Hydrogen-bearing iron peroxide and the origin of ultralow-velocity zones

Liu, Jin; Hu, Qingyang; Young Kim, Duck; Wu, Zhongqing; Wang, Wenzhong; Xiao, Yuming; Chow, Paul; Meng, Yue; Prakapenka, Vitali B.; Mao, Ho-Kwang; Mao, Wendy L.

doi:10.1038/nature24461

Title: Hydrogen-bearing iron peroxide and the origin of ultralow-velocity zones

Journal Article · Wed Nov 22 00:00:00 EST 2017 · Nature (London)

DOI:https://doi.org/10.1038/nature24461· OSTI ID:1423460

Liu, Jin ^[1]; Hu, Qingyang ^[2]; Young Kim, Duck ^[3]; Wu, Zhongqing ^[4]; Wang, Wenzhong ^[4]; Xiao, Yuming ^[5]; Chow, Paul ^[5]; Meng, Yue ^[5]; Prakapenka, Vitali B. ^[6]; Mao, Ho-Kwang ^[7]; Mao, Wendy L. ^[8]

Stanford Univ., CA (United States). Dept. of Geological Sciences
Stanford Univ., CA (United States). Dept. of Geological Sciences; Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Univ. of Science and Technology of China, Hefei (China). Lab. of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences
Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources
Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
Stanford Univ., CA (United States). Dept. of Geological Sciences; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)

Ultralow-velocity zones (ULVZs) at Earth’s core–mantle boundary region have important implications for the chemical composition and thermal structure of our planet, but their origin has long been debated. Hydrogen-bearing iron peroxide (FeO₂H_x) in the pyrite-type crystal structure was recently found to be stable under the conditions of the lowermost mantle. Using high-pressure experiments and theoretical calculations, we find that iron peroxide with a varying amount of hydrogen has a high density and high Poisson ratio as well as extremely low sound velocities consistent with ULVZs. Here in this paper we also report a reaction between iron and water at 86 gigapascals and 2,200 kelvin that produces FeO₂H_x. This would provide a mechanism for generating the observed volume occupied by ULVZs through the reaction of about one-tenth the mass of Earth’s ocean water in subducted hydrous minerals with the effectively unlimited reservoir of iron in Earth’s core. Unlike other candidates for the composition of ULVZs, FeO₂H_x synthesized from the superoxidation of iron by water would not require an extra transportation mechanism to migrate to the core–mantle boundary. These dense FeO2Hx-rich domains would be expected to form directly in the core–mantle boundary region and their properties would provide an explanation for the many enigmatic seismic features that are observed in ULVZs

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1423460

Journal Information:: Nature (London), Vol. 551, Issue 7681; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 98 works

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