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Title: In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressures

Abstract

Properties of liquid silicates under high-pressure and high-temperature conditions are critical for modeling the dynamics and solidification mechanisms of the magma ocean in the early Earth, as well as for constraining entrainment of melts in the mantle and in the present-day core–mantle boundary. In this paper, we present in situ structural measurements by X-ray diffraction of selected amorphous silicates compressed statically in diamond anvil cells (up to 157 GPa at room temperature) or dynamically by laser-generated shock compression (up to 130 GPa and 6,000 K along the MgSiO3glass Hugoniot). The X-ray diffraction patterns of silicate glasses and liquids reveal similar characteristics over a wide pressure and temperature range. Beyond the increase in Si coordination observed at 20 GPa, we find no evidence for major structural changes occurring in the silicate melts studied up to pressures and temperatures exceeding Earth’s core mantle boundary conditions. This result is supported by molecular dynamics calculations. Our findings reinforce the widely used assumption that the silicate glasses studies are appropriate structural analogs for understanding the atomic arrangement of silicate liquids at these high pressures.

Authors:
 [1];  [2]; ORCiD logo [3];  [3];  [3]; ORCiD logo [3];  [4];  [4]; ORCiD logo [5];  [5]; ORCiD logo [6];  [7];  [8];  [8];  [8];  [8];  [8];  [8];  [9];  [10] more »; ORCiD logo [10]; ORCiD logo [11];  [3] « less
+ Show Author Affiliations
  1. Sorbonne Univ., Paris (France); Univ. of Grenoble (France)
  2. Ecole Polytechnique, Palaiseau (France); Univ. of Oslo (Norway)
  3. Ecole Polytechnique, Palaiseau (France)
  4. Sorbonne Univ., Paris (France)
  5. Arizona State Univ., Tempe, AZ (United States)
  6. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Stanford Univ., CA (United States)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  9. Univ. Clermont Auvergne, Clermont-Ferrand (France)
  10. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  11. Helmholtz-Zentrum Dresden Rossendorf, Dresden (Germany)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Research Council (ERC); National Science Foundation (NSF); Agence National de la Recherche
OSTI Identifier:
1637929
Grant/Contract Number:  
AC02-76SF00515; 670787; EAR0738873; ANR-16-CE31-0008; SF00515, FWP-100182
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 117; Journal Issue: 22; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; amorphous silicates; high pressure; shock compression; static compression; XFEL diffraction

Citation Formats

Morard, Guillaume, Hernandez, Jean-Alexis, Guarguaglini, Marco, Bolis, Riccardo, Benuzzi-Mounaix, Alessandra, Vinci, Tommaso, Fiquet, Guillaume, Baron, Marzena A., Shim, Sang Heon, Ko, Byeongkwan, Gleason, Arianna E., Mao, Wendy L., Alonso-Mori, Roberto, Lee, Hae Ja, Nagler, Bob, Galtier, Eric, Sokaras, Dimosthenis, Glenzer, Siegfried H., Andrault, Denis, Garbarino, Gaston, Mezouar, Mohamed, Schuster, Anja K., and Ravasio, Alessandra. In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressures. United States: N. p., 2020. Web. doi:10.1073/pnas.1920470117.
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Morard, Guillaume, Hernandez, Jean-Alexis, Guarguaglini, Marco, Bolis, Riccardo, Benuzzi-Mounaix, Alessandra, Vinci, Tommaso, Fiquet, Guillaume, Baron, Marzena A., Shim, Sang Heon, Ko, Byeongkwan, Gleason, Arianna E., Mao, Wendy L., Alonso-Mori, Roberto, Lee, Hae Ja, Nagler, Bob, Galtier, Eric, Sokaras, Dimosthenis, Glenzer, Siegfried H., Andrault, Denis, Garbarino, Gaston, Mezouar, Mohamed, Schuster, Anja K., & Ravasio, Alessandra. In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressures. United States. https://doi.org/10.1073/pnas.1920470117
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Morard, Guillaume, Hernandez, Jean-Alexis, Guarguaglini, Marco, Bolis, Riccardo, Benuzzi-Mounaix, Alessandra, Vinci, Tommaso, Fiquet, Guillaume, Baron, Marzena A., Shim, Sang Heon, Ko, Byeongkwan, Gleason, Arianna E., Mao, Wendy L., Alonso-Mori, Roberto, Lee, Hae Ja, Nagler, Bob, Galtier, Eric, Sokaras, Dimosthenis, Glenzer, Siegfried H., Andrault, Denis, Garbarino, Gaston, Mezouar, Mohamed, Schuster, Anja K., and Ravasio, Alessandra. Fri . "In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressures". United States. https://doi.org/10.1073/pnas.1920470117. https://www.osti.gov/servlets/purl/1637929.
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@article{osti_1637929,
title = {In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressures},
author = {Morard, Guillaume and Hernandez, Jean-Alexis and Guarguaglini, Marco and Bolis, Riccardo and Benuzzi-Mounaix, Alessandra and Vinci, Tommaso and Fiquet, Guillaume and Baron, Marzena A. and Shim, Sang Heon and Ko, Byeongkwan and Gleason, Arianna E. and Mao, Wendy L. and Alonso-Mori, Roberto and Lee, Hae Ja and Nagler, Bob and Galtier, Eric and Sokaras, Dimosthenis and Glenzer, Siegfried H. and Andrault, Denis and Garbarino, Gaston and Mezouar, Mohamed and Schuster, Anja K. and Ravasio, Alessandra},
abstractNote = {Properties of liquid silicates under high-pressure and high-temperature conditions are critical for modeling the dynamics and solidification mechanisms of the magma ocean in the early Earth, as well as for constraining entrainment of melts in the mantle and in the present-day core–mantle boundary. In this paper, we present in situ structural measurements by X-ray diffraction of selected amorphous silicates compressed statically in diamond anvil cells (up to 157 GPa at room temperature) or dynamically by laser-generated shock compression (up to 130 GPa and 6,000 K along the MgSiO3glass Hugoniot). The X-ray diffraction patterns of silicate glasses and liquids reveal similar characteristics over a wide pressure and temperature range. Beyond the increase in Si coordination observed at 20 GPa, we find no evidence for major structural changes occurring in the silicate melts studied up to pressures and temperatures exceeding Earth’s core mantle boundary conditions. This result is supported by molecular dynamics calculations. Our findings reinforce the widely used assumption that the silicate glasses studies are appropriate structural analogs for understanding the atomic arrangement of silicate liquids at these high pressures.},
doi = {10.1073/pnas.1920470117},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 22,
volume = 117,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2020},
month = {Fri May 15 00:00:00 EDT 2020}
}
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https://doi.org/10.1073/pnas.1920470117
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