Dehydrogenation of goethite in Earth’s deep lower mantle

Hu, Qingyang; Kim, Duck Young; Liu, Jin; Meng, Yue; Yang, Liuxiang; Zhang, Dongzhou; Mao, Wendy L.; Mao, Ho-kwang

doi:10.1073/pnas.1620644114

Title: Dehydrogenation of goethite in Earth’s deep lower mantle

Journal Article · Tue Jan 31 00:00:00 EST 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1620644114· OSTI ID:1341909

Hu, Qingyang ^[1]; Kim, Duck Young ^[2]; Liu, Jin ^[3]; Meng, Yue ^[4]; Yang, Liuxiang ^[5]; Zhang, Dongzhou ^[6]; Mao, Wendy L. ^[3]; Mao, Ho-kwang ^[5]

Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People’s Republic of China,, Department of Geological Sciences, Stanford University, Stanford, CA 94305,, Geophysical Laboratory, Carnegie Institution, Washington, DC 20015,
Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People’s Republic of China,
Department of Geological Sciences, Stanford University, Stanford, CA 94305,
High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution, Argonne, IL 60439,
Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, People’s Republic of China,, Geophysical Laboratory, Carnegie Institution, Washington, DC 20015,
Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822

The cycling of hydrogen influences the structure, composition, and stratification of Earth’s interior. Our recent discovery of pyrite-structured iron peroxide (designated as the P phase) and the formation of the P phase from dehydrogenation of goethite FeO₂H implies the separation of the oxygen and hydrogen cycles in the deep lower mantle beneath 1,800 km. Here we further characterize the residual hydrogen, x, in the P-phase FeO₂Hx. Using a combination of theoretical simulations and high-pressure–temperature experiments, we calibrated the x dependence of molar volume of the P phase. Within the current range of experimental conditions, we observed a compositional range of P phase of 0.39 < x < 0.81, corresponding to 19–61% dehydrogenation. Increasing temperature and heating time will help release hydrogen and lower x, suggesting that dehydrogenation could be approaching completion at the high-temperature conditions of the lower mantle over extended geological time. Our observations indicate a fundamental change in the mode of hydrogen release from dehydration in the upper mantle to dehydrogenation in the deep lower mantle, thus differentiating the deep hydrogen and hydrous cycles.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-99ER45775; NA0001974

OSTI ID:: 1341909

Alternate ID(s):: OSTI ID: 1344573

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 114 Journal Issue: 7; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 69 works

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