Thermoelasticity of a mineral composite and a reconsideration of lower mantle properties

Details Thermoelasticity of a mineral composite and a reconsideration of lower mantle properties Thermoelasticity of a mineral composite and a reconsideration of lower mantle properties

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pepi..106..219s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 106, Issue 3-4, p. 219-236.

Physics

25

Scientific paper

A re-examination of thermal and elastic properties of a mineral composite, emphasising derivative properties, especially pressure and temperature dependences of incompressibility, resolves residual doubts about the application to the lower mantle of thermodynamic estimates of these properties. The only counter-intuitive conclusion is that (∂KS/∂P)S~4.21 at P=0, which is significantly higher than the values for component minerals. This leads to a revised lower mantle equation-of-state and also to a new one which requires as input only K0'=4.21 and K∞'=1.425: K'=K0'(K∞'/K0')K∞'P/K. These equations and three other finite strain theories fit the lower mantle PREM tabulation very well and agree on the extrapolation to P=0: K0=203.1+/-1.6 GPa, μ0=128.2+/-1.2 GPa, ρ0=3972.5+/-4.0 kg m-3. A further six finite strain equations are rejected as incompatible with homogeneity of the lower mantle. Application of the theory to thermal properties gives δS=- (1/αKS)(∂KS/∂T)P decreasing with depth from 2.7 to 1.6 over the lower mantle depth range. Conversely ɛ=-(1/αμ)(∂μ/∂T)P increases with depth from 7.1 to 8.7. Corresponding values of (∂lnVS/∂lnVP)P vary from 1.7 to 2.3. This conclusion is not consistent with a simple thermal interpretation of tomographic observations of lower mantle velocity anomalies. Compositional variations must be invoked.

Affiliated with

Also associated with

No associations

Rating

Thermoelasticity of a mineral composite and a reconsideration of lower mantle properties 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 Thermoelasticity of a mineral composite and a reconsideration of lower mantle properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermoelasticity of a mineral composite and a reconsideration of lower mantle properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1744185