Physics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..120..153l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 120, Issue 1-2, p. 153-163.
Physics
9
Scientific paper
Polycrystalline specimens of two pyrope-majorite garnets2 (Py62Mj38 and Py62Mj38) were synthesized in a 2000-ton uniaxial split-sphere apparatus (USSA-2000) at pressures of 16 GPa and temperatures of 1670 K for run durations of about 2 h using homogeneous glasses as starting materials. Ultrasonic interferometric measurements on these specimens were conducted at pressures up to 9 GPa at room temperature using a 1000-ton uniaxial split-cylinder apparatus (USCA-1000) with Bi as an internal pressure marker. From the measurements of the travel times for compressional (P) and shear (S) waves, the velocities and elastic moduli are calculated using length/density changes determined from the travel-time data. Third-order Eulerian finite strain analysis of these data yield the longitudinal (L) and shear (G) moduli and their pressure derivatives [M0'=(∂M/∂P)T]: for Py62Mj38, L0=291+/-6 GPa and L0'=9.1+/-0.6, G0=90+/-1 GPa and G0'=1.9+/-0.2, from which we calculate the values for the adiabatic bulk modulus (K=L-4/3 G) to be K0=171+/-5 GPa and K0'=6.2+/-0.5. These new data for the shear modulus and its pressure derivative are in agreement with the previous values for the same composition (Rigden, S.M., Gwanmesia, G.D., Liebermann, R.C., 1994. Elastic wave velocities of a pyrope-majorite garnet to 3 GPa. Phys. Earth Planet. Inter. 86, 35-44.), but the P wave velocity, the bulk modulus and its pressure derivative are somewhat higher. For the Py50Mj50 composition, these values are L0=289+/-6 GPa, L0'=9.2+/-0.7, G0=89+/-1 GPa, G0'=2.1+/-0.2, K0=170+/-5 GPa, and K0'=6.4+/-0.5. The high-pressure derivatives of K and G for these Py-Mj garnets may be important in explaining the high velocity gradients observed in seismic models of the transition zone of the Earth's mantle.
Chen Gang
Gwanmesia Gabriel D.
Liebermann Robert C.
Liu Jinjie
No associations
LandOfFree
Elastic wave velocities of pyrope-majorite garnets (Py62Mj38 and Py50Mj50) to 9 GPa does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Elastic wave velocities of pyrope-majorite garnets (Py62Mj38 and Py50Mj50) to 9 GPa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elastic wave velocities of pyrope-majorite garnets (Py62Mj38 and Py50Mj50) to 9 GPa will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1247516