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 · 30 January 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

Significance We found at high pressure–temperature ( P-T ) that the goethite FeO ₂ H transforms to P-phase FeO ₂ via a two-step dehydrogenation process. First it releases some hydrogen to form P-phase FeO ₂ H x , and then it continuously releases the remaining hydrogen through prolonged heating. This work provides an important example that the dehydration reaction changes to dehydrogenation of FeO ₂ H at the lower mantle conditions and the cycles of hydrogen and water become separated.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

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

OSTI ID:: 1341909

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 Journal Issue: 7 Vol. 114; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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