Sound velocities in shock-synthesized stishovite to 72 GPa

Berryman, Eleanor J.; Winey, J. M.; Gupta, Yogendra M.; Duffy, Thomas S.
Issue date: 2019
Cite as:
Berryman, Eleanor J., Winey, J. M., Gupta, Yogendra M., & Duffy, Thomas S. (2019). Sound velocities in shock-synthesized stishovite to 72 GPa [Data set]. Geophysical Research Letters.
@electronic{berryman_eleanor_j_2019,
  author      = {Berryman, Eleanor J. and
                Winey, J. M. and
                Gupta, Yogendra M. and
                Duffy, Thomas S.},
  title       = {{Sound velocities in shock-synthesized st
                ishovite to 72 GPa}},
  publisher   = {{Geophysical Research Letters}},
  year        = 2019
}
Abstract:

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. Here, 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 reacts 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 results provide direct evidence for shock-induced melting, in agreement with previous pyrometry data.

Show More
# Filename Description Filesize
1 17-2S33 PDV.csv 29.7 KB
2 17-2S33 VISAR.csv 1.01 MB
3 17-2S37 PDV.csv 23.7 KB
4 17-2S37 VISAR.csv 215 KB
5 17-2S49 PDV.csv 48.7 KB
6 17-2S49 VISAR.csv 386 KB
7 17-2S50 PDV.csv 52.3 KB
8 17-2S50 VISAR.csv 210 KB
9 18-2S13 PDV.csv 44.7 KB
10 18-2S13 VISAR.csv 305 KB
11 18-2S14 PDV.csv 60 KB
12 18-2S14 VISAR.csv 737 KB
13 18-2S15 PDV.csv 142 KB
14 18-2S15 VISAR.csv 673 KB
15 18-2SH06 PDV.csv 36.9 KB
16 18-2SH06 VISAR.csv 412 KB
17 18-2SH10 PDV.csv 21.3 KB
18 18-2SH10 VISAR.csv 275 KB
19 18-2SH13 PDV.csv 28.6 KB
20 18-2SH13 VISAR.csv 336 KB
21 18-2SH15 PDV.csv 42.7 KB
22 18-2SH15 VISAR.csv 544 KB
23 18-2SH16 PDV.csv 35.6 KB
24 18-2SH16 VISAR.csv 370 KB
25 READ ME.txt 1.66 KB