Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...49..314s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 49, Issue 3-4, p. 314-324.
Physics
14
Scientific paper
An analysis of garnet, olivine, and ultramafic aggregate deformation data is performed using a Burgers body rheology such that transient elasticities and viscosities can be obtained. Our results are indicative of transient shear moduli with magnitudes of about one tenth the isostatic shear moduli, and transient viscosities of magnitudes 0.5-0.7 of the steady state viscosities. These values differ significantly from those chosen by previous workers for Burgers body parameters pertinent to transient creep in the lower mantle. Transient viscosity appears to have the same temperature dependence as the steady state viscosity, which requires that the transient elastic modulus becomes rapidly weaker with increasing temperature. Hydrolytic weakening also seems to be accompanied by a weaker transient elastic modulus, implying a longer relaxation period of the transient strains in water-weakened experiments. A discrepancy between previously reported transient behavior in dunite and the data analyzed here can be attributed to errors in the dunite experimental data.
Carpenter F. O.
Smith Brad K.
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