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American Mineralogist; October 2001; v. 86; no. 10; p. 1209-1218
© 2001 Mineralogical Society of America
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Elasticity of six polycrystalline silicate garnets at pressure up to 3.0 GPa

Zichao Wang and Shaocheng Ji*

Département des Génies Civil, Géologique et des Mines, École Polytechnique de Montréal, C.P. 6079, Succursale Centre-Ville, Montréal, Québec H3C 3A7, Canada

Correspondence: * E-mail: sji{at}courriel.polymtl.ca

The elasticities of six polycrystalline silicate garnets (almandine, grossular, pyrope, uvarovite, andradite, and Prp25Alm56Spe19) have been experimentally studied at pressures up to 3.0 GPa using a phase comparison method with an ultrasonic interferometer in a liquid cell piston-cylinder apparatus. Complete elasticity data sets (P- and S-wave velocities, bulk moduli Ks, shear moduli G, and their first pressure derivatives KS' and G') have been obtained for all six garnets, and are used together with an up-to-date compilation of garnet elasticity data to examine composition-elasticity systematics of garnets. Our results suggest that pyralspite and ugrandite have different relationships between bulk sound velocity (V{phi}) and mean atomic weight (Formula0), between Poisson’s ratio ({sigma}) and density ({rho}), and between G/Ks and Ks/{rho} ratios. A large error may occur when the systematics are applied across different garnet groups.




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