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Title: Sound Velocities in Shock-Synthesized Stishovite to 72 GPa

Journal Article · · Geophysical Research Letters
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]
  1. Princeton Univ., NJ (United States). Dept. of Geosciences; CanmetMINING, Ottawa, ON (Canada). Natural Resources Canada; Institute for Shock Physics, Washington State University
  2. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
  3. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics; Washington State Univ., Pullman, WA (United States). Dept. of Physics and Astronomy
  4. Princeton Univ., NJ (United States). Dept. of Geosciences

Stishovite (rutile-type SiO2) is the archetype of dense silicates and may occur in post garnet eclogitic rocks at lower-mantle conditions. Sound velocities in stishovite are fundamental to understanding its mechanical and thermodynamic behavior at high pressure and temperature. In this work, we use plate-impact experiments combined with velocity interferometry to determine the stress, density, and longitudinal sound speed in stishovite formed during shock compression of fused silica at 44 GPa and above. The measured sound speeds range from 12.3(8) km/s at 43.8(8) GPa to 9.8(4) km/s at 72.7(11) GPa. The decrease observed at 64 GPa reflects a decrease in the shear modulus of stishovite, likely due to the onset of melting. By 72 GPa, the measured sound speed agrees with the theoretical bulk sound speed indicating loss of all shear stiffness due to complete melting. Our sound velocity findings offer direct evidence for shock-induced melting, in agreement with previous pyrometry data.

Research Organization:
Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Grant/Contract Number:
NA0002007
OSTI ID:
1579570
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 23 Vol. 46; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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