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Title: Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle

Abstract

Combined synthesis experiments and first-principles calculations show that MgSiO3-perovskite with minor Al or Fe does not incorporate significant OH under lower mantle conditions. Perovskite, stishovite, and residual melt were synthesized from natural Bamble enstatite samples (Mg/(Fe+Mg) = 0.89 and 0.93; Al2O3 < 0.1 wt% with 35 and 2065 ppm wt H2O, respectively) in the laser-heated diamond anvil cell at 1600-2000 K and 25-65 GPa. Combined Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction, and ex-situ transmission electron microscopy (TEM) analysis demonstrates little difference in the resulting perovskite as a function of initial water content. Four distinct OH vibrational stretching bands are evident upon cooling below 100 K (3576, 3378, 3274, and 3078 cm-1), suggesting 4 potential bonding sites for OH in perovskite with a maximum water content of 220 ppm wt H2O, and likely no more than 10 ppm wt H2O. Complementary, Fe-free, first-principles calculations predict multiple potential bonding sites for hydrogen in perovskite, each with significant solution enthalpy (0.2 eV/defect). We calculate that perovskite can dissolve less than 37 ppm wt H2O (400 ppm H/Si) at the top of the lower mantle, decreasing to 31 ppm wt H2O (340 ppm H/Si) at 125 GPa and 3000 K in the absencemore » of a melt or fluid phase. Here, we propose that these results resolve a long-standing debate of the perovskite melting curve and explain the order of magnitude increase in viscosity from upper to lower mantle.« less

Authors:
 [1];  [1];  [2];  [1];  [3]
+ Show Author Affiliations
  1. The Ohio State Univ., Columbus, OH (United States)
  2. U.S. Army Research Lab., RDRL-WMRD, Aberdeen, MD (United States)
  3. Carnegie Institution of Washington, Washington, D.C. (United States)
Publication Date:
Research Org.:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1335876
Grant/Contract Number:  
NA0002006
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 120; Journal Issue: 2; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Panero, Wendy R., Pigott, Jeffrey S., Reaman, Daniel M., Kabbes, Jason E., and Liu, Zhenxian. Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle. United States: N. p., 2015. Web. doi:10.1002/2014JB011397.
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Panero, Wendy R., Pigott, Jeffrey S., Reaman, Daniel M., Kabbes, Jason E., & Liu, Zhenxian. Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle. United States. https://doi.org/10.1002/2014JB011397
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Panero, Wendy R., Pigott, Jeffrey S., Reaman, Daniel M., Kabbes, Jason E., and Liu, Zhenxian. Thu . "Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle". United States. https://doi.org/10.1002/2014JB011397. https://www.osti.gov/servlets/purl/1335876.
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@article{osti_1335876,
title = {Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle},
author = {Panero, Wendy R. and Pigott, Jeffrey S. and Reaman, Daniel M. and Kabbes, Jason E. and Liu, Zhenxian},
abstractNote = {Combined synthesis experiments and first-principles calculations show that MgSiO3-perovskite with minor Al or Fe does not incorporate significant OH under lower mantle conditions. Perovskite, stishovite, and residual melt were synthesized from natural Bamble enstatite samples (Mg/(Fe+Mg) = 0.89 and 0.93; Al2O3 < 0.1 wt% with 35 and 2065 ppm wt H2O, respectively) in the laser-heated diamond anvil cell at 1600-2000 K and 25-65 GPa. Combined Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction, and ex-situ transmission electron microscopy (TEM) analysis demonstrates little difference in the resulting perovskite as a function of initial water content. Four distinct OH vibrational stretching bands are evident upon cooling below 100 K (3576, 3378, 3274, and 3078 cm-1), suggesting 4 potential bonding sites for OH in perovskite with a maximum water content of 220 ppm wt H2O, and likely no more than 10 ppm wt H2O. Complementary, Fe-free, first-principles calculations predict multiple potential bonding sites for hydrogen in perovskite, each with significant solution enthalpy (0.2 eV/defect). We calculate that perovskite can dissolve less than 37 ppm wt H2O (400 ppm H/Si) at the top of the lower mantle, decreasing to 31 ppm wt H2O (340 ppm H/Si) at 125 GPa and 3000 K in the absence of a melt or fluid phase. Here, we propose that these results resolve a long-standing debate of the perovskite melting curve and explain the order of magnitude increase in viscosity from upper to lower mantle.},
doi = {10.1002/2014JB011397},
journal = {Journal of Geophysical Research. Solid Earth},
number = 2,
volume = 120,
place = {United States},
year = {Thu Feb 26 00:00:00 EST 2015},
month = {Thu Feb 26 00:00:00 EST 2015}
}
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https://doi.org/10.1002/2014JB011397
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