Computer Science – Sound
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9614319d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 10, 1991, p. 14,319-14,330. Research supported by NSF and NASA.
Computer Science
Sound
21
Brucite, Earth Mantle, Equations Of State, Shock Waves, Earth Planetary Structure, Moisture Content, Phase Transformations, Planetary Composition, Planetary Evolution
Scientific paper
New shock equation of state (EOS) data on magnesium hydroxide between 12 and 60 GPa is presented. It is found that the brucite EOS data between 12 and 97 GPa can be fit with a single linear U(s) - u(p) relationship: U(s) = 4.76(0.11) + 1.35(0.05)u(p). The third order Birch-Murnaghan equation parameters are K(os) = 51 + or - 4 GPa and K(os)prime = 5.0 + or - 0.4. The first partial release states measured for brucite Mg(OH)2 are reported. Calculated phase boundaries using the EOS data are found to be consistent with the experimental data and indicate that brucite is unlikely to be stable under lower mantle conditions. At high pressure, bulk sound velocities calculated for MgO and Mg(OH)2 are very similar, indicating that the presence of hydrous assemblages in the lower mantle may not produce anomalous bulk seismic velocities. A comparison of densities in brucite and other high-pressure phases under mantle conditions shows that the water content of the lower mantle is between 0 and 3 wt pct.
Ahrens Thomas J.
Duffy Thomas S.
Lange Manfred A.
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