In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressures
- Sorbonne Univ., Paris (France); Univ. of Grenoble (France)
- Ecole Polytechnique, Palaiseau (France); Univ. of Oslo (Norway)
- Ecole Polytechnique, Palaiseau (France)
- Sorbonne Univ., Paris (France)
- Arizona State Univ., Tempe, AZ (United States)
- Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Stanford Univ., CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. Clermont Auvergne, Clermont-Ferrand (France)
- European Synchrotron Radiation Facility (ESRF), Grenoble (France)
- Helmholtz-Zentrum Dresden Rossendorf, Dresden (Germany)
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Research Council (ERC); National Science Foundation (NSF); Agence National de la Recherche
- Grant/Contract Number:
- AC02-76SF00515; 670787; EAR0738873; ANR-16-CE31-0008; SF00515, FWP-100182
- OSTI ID:
- 1637929
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, Issue 22; ISSN 0027-8424
- Publisher:
- National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
X-ray Raman scattering study of MgSiO₃ glass at high pressure: Implication for triclustered MgSiO₃ melt in Earth's mantle
Ultrafast x-ray detection of low-spin iron in molten silicate under deep planetary interior conditions