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

Abstract

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 FeO 2 H 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 FeO 2 H x . 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.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1341909
Alternate Identifier(s):
OSTI ID: 1344573
Grant/Contract Number:  
FG02-99ER45775; NA0001974
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 114 Journal Issue: 7; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Hu, Qingyang, Kim, Duck Young, Liu, Jin, Meng, Yue, Yang, Liuxiang, Zhang, Dongzhou, Mao, Wendy L., and Mao, Ho-kwang. Dehydrogenation of goethite in Earth’s deep lower mantle. United States: N. p., 2017. Web. doi:10.1073/pnas.1620644114.
Hu, Qingyang, Kim, Duck Young, Liu, Jin, Meng, Yue, Yang, Liuxiang, Zhang, Dongzhou, Mao, Wendy L., & Mao, Ho-kwang. Dehydrogenation of goethite in Earth’s deep lower mantle. United States. doi:10.1073/pnas.1620644114.
Hu, Qingyang, Kim, Duck Young, Liu, Jin, Meng, Yue, Yang, Liuxiang, Zhang, Dongzhou, Mao, Wendy L., and Mao, Ho-kwang. Tue . "Dehydrogenation of goethite in Earth’s deep lower mantle". United States. doi:10.1073/pnas.1620644114.
@article{osti_1341909,
title = {Dehydrogenation of goethite in Earth’s deep lower mantle},
author = {Hu, Qingyang and Kim, Duck Young and Liu, Jin and Meng, Yue and Yang, Liuxiang and Zhang, Dongzhou and Mao, Wendy L. and Mao, Ho-kwang},
abstractNote = {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 FeO 2 H 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 FeO 2 H x . 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.},
doi = {10.1073/pnas.1620644114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 7,
volume = 114,
place = {United States},
year = {2017},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1073/pnas.1620644114

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Cited by: 11 works
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