Elastic properties of garnet solid-solution series

Babuška, Vladislav; Fiala, Jiřı́; Kumazawa, Mineo; Ohno, Ichiro; Sumino, Yoshio

doi:10.1016/0031-9201(78)90086-9

Cited by 199 publications

(83 citation statements)

References 24 publications

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“…Its chemical formula shows differences compared to the glaucophane individual of Bezacier et al (2010), but the elastic data of Bezacier et al (2010) sample. The composition of garnet is close to the almandine end member in the pyrope-almandinespessartine system, which justifies the use of the almandine elastic constants of Babuska et al (1978). Nevertheless, we conclude that for some main rock constituents the elastic constants may differ from the 'true' mineral constants in our samples.…”

Section: Accepted M Manuscriptsupporting

confidence: 57%

Crystallographic preferred orientations of exhumed subduction channel rocks from the Eclogite Zone of the Tauern Window (Eastern Alps, Austria), and implications on rock elastic anisotropies at great depths

et al. 2015

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Section: Accepted M Manuscriptsupporting

confidence: 57%

Crystallographic preferred orientations of exhumed subduction channel rocks from the Eclogite Zone of the Tauern Window (Eastern Alps, Austria), and implications on rock elastic anisotropies at great depths

et al. 2015

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“…For sample SL50 from the Sulu terrain, we also considered the contribution of quartz in the seismic properties. Seismic calculations were carried out using the single crystal elastic constants measured at room temperature and atmospheric pressure by Bhagat et al (1992) for omphacite (30% diopside, 58% jadeite), Babuska et al (1978) for garnet (40% pyrope, 40% almandin, 20% grossular) and McSkimin et al (1965) for quartz. For sample eclo 01 containing 10% of epidote, we used the epidote elastic constants reported by Ryzhova et al (1966) but we assumed this mineral as randomly oriented.…”

Section: Seismic Properties Calculationmentioning

confidence: 99%

EBSD-measured lattice-preferred orientations and seismic properties of eclogites

Bascou¹,

Barruol²,

Vauchez³

et al. 2001

Tectonophysics

132

102

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measured lattice-preferred orientations and seismic properties of eclogites. Tectonophysics, Elsevier, 2001, 342, pp.61 -80. <10.1016/S0040-1951 AbstractWe investigated the deformation mechanisms and the seismic properties of 10 eclogite samples from different localities (Alps, Norway, Mali and eastern China) through the analysis of their microstructures and lattice-preferred orientations (LPO). These samples are representative of various types and intensity of deformation under eclogitic metamorphic conditions. Omphacite and garnet LPO were determined from electron backscatter diffraction (EBSD) technique. Garnet appears to be almost randomly oriented whereas omphacite develops strong LPO, characterized by the [001]-axes concentrated sub-parallel to the lineation, and the (010)-poles concentrated sub-perpendicular to the foliation. In order to analyze the deformation mechanisms that produced such omphacite LPO, we compare our observations to LPO simulated by viscoplastic selfconsistent numerical models. A good fit to the measured LPO is obtained for models in which the dominant slip systems are 1/2h110i{110}, [001] {110} and [001] (100). Dominant activation of these slip systems is in agreement with TEM studies of naturally deformed omphacite. Seismic properties of eclogite are calculated by combining the measured LPO and the single crystal elastic constants of omphacite and garnet. Although eclogite seismic anisotropies are very weak (less than 3% for both P-and S-wave), they are generally characterized by a maximum P-wave velocity sub-parallel to the lineation and by a minimum velocity approximately normal to foliation. The mean P-and S-wave velocities are high (respectively, 8.6 and 4.9 km/s). The S-wave anisotropy pattern displays complex relationships with the structural frame but the fast polarization plane generally tends to be parallel to the foliation. Calculated reflection coefficients show that an eclogite/crust interface is generally a good reflector (Rc > 0.1), whereas an eclogite body embedded in the upper mantle would be hardly detectable. D

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“…Much recent work has been done to characterize, in particular, how the elastic properties of pyralspite, uvarovite, and andradite garnets depend on the chemical composition (Wang and Simmons 1974;Weaver et al 1976;Leitner et al 1980;Babuska et al 1978;Bass 1986;O'Neill et al 1989;Bass 1989;O'Neill et al 1991). Recent Brillioun spectroscopy has also provided new elasticity data on majorite garnets at ambient conditions (Bass and Kanzaki 1990;Yeganeh-Haeri et al 1990).…”

Section: Introductionmentioning

confidence: 96%

High-temperature thermal expansion and elasticity of calcium-rich garnets

1992

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Abstract. We present new high temperature elasticity data on two grossular garnet specimens. One specimen is single-crystal, of nearly endmember grossular, the other is polycrystalline with about 22% molar andradite. Our data extend the high temperature regime for which any garnet elasticity data are available from 1000 to 1350 K and the compositional range of temperature data to near endmember grossular. We also present new data on the thermal expansivity of calcium-rich garnet. We find virtually no discernable differences in the temperature T derivatives at ambient conditions of the isotropic bulk Ks and shear # moduli when comparing our results between these two specimens. These calcium-rich garnets have the lowest values of [(3Ks/OT)eI=(1.47, 1.49) x l0-2GPa/K, and among the highest values of I(0#/0T)e[= 1.25 x 10 -2 GPa/K, when compared with other garnets. Small, but measurable, nonlinear temperature dependences of most of the elastic moduli are observed. Several dimensionless parameters are computed with the new data and used to illustrate the effects of different assumptions on elastic equations of state extrapolated to high temperatures. We discuss how dimensionless parameters and other systematic considerations can be useful in estimating the temperature dependence of some properties of garnet phases for which temperature data are not yet available. While we believe it is premature to quantitatively predict the temperature variation of Ks and/~ for majorite garnets, our results have bearing on the amount of diopside required to explain the shear velocity gradients in Earth's transition zone.

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Elastic properties of garnet solid-solution series

Cited by 199 publications

References 24 publications

Crystallographic preferred orientations of exhumed subduction channel rocks from the Eclogite Zone of the Tauern Window (Eastern Alps, Austria), and implications on rock elastic anisotropies at great depths

Crystallographic preferred orientations of exhumed subduction channel rocks from the Eclogite Zone of the Tauern Window (Eastern Alps, Austria), and implications on rock elastic anisotropies at great depths

EBSD-measured lattice-preferred orientations and seismic properties of eclogites

High-temperature thermal expansion and elasticity of calcium-rich garnets

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