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

Guillaume Morard; Jean-Alexis Hernandez; Marco Guarguaglini; Riccardo Bolis; Alessandra Benuzzi-Mounaix; Tommaso Vinci; Guillaume Fiquet; Marzena Baron; Sang Heon Shim; Byeongkwan Ko; Arianna Gleason; Wendy Mao; Roberto Alonso-Mori; Hae Ja Lee; Bob Nagler; Eric Galtier; Dimosthenis Sokaras; Siegfried Glenzer; Denis Andrault; Gaston Garbarino; Mohamed Mezouar; Anja Schuster; Alessandra Ravasio

doi:10.1073/pnas.1920470117

Journal articles

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

Guillaume Morard ^{1, 2} Jean-Alexis Hernandez ^{3, 4} Marco Guarguaglini ³ Riccardo Bolis ³ Alessandra Benuzzi-Mounaix ³ Tommaso Vinci ³ Guillaume Fiquet ¹ Marzena Baron ¹ Sang Heon Shim ⁵ Byeongkwan Ko ⁵ Arianna Gleason ⁶ Wendy Mao ⁷ Roberto Alonso-Mori ⁶ Hae Ja Lee ⁶ Bob Nagler ⁶ Eric Galtier ⁶ Dimosthenis Sokaras ⁶ Siegfried Glenzer ⁶ Denis Andrault ⁸ Gaston Garbarino ⁹ Mohamed Mezouar ⁹ Anja Schuster ¹⁰ Alessandra Ravasio ³

1 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie

2 ISTerre - Institut des Sciences de la Terre

3 LULI - Laboratoire pour l'utilisation des lasers intenses

4 UiO - University of Oslo

5 ASU - Arizona State University [Tempe]

6 SLAC - SLAC National Accelerator Laboratory

7 GS - Department of Geological Sciences [Stanford]

8 LMV - Laboratoire Magmas et Volcans

9 ESRF - European Synchrotron Radiation Facility

10 HZDR - Helmholtz-Zentrum Dresden-Rossendorf

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. Here, 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 6000 K along the MgSiO3 glass 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.

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Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences / Geophysics [physics.geo-ph]

Physics [physics] / Condensed Matter [cond-mat] / Materials Science [cond-mat.mtrl-sci]

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

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

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