Thermoelastic models of minerals and the composition of the Earth's lower mantle

Details Thermoelastic models of minerals and the composition of the Earth's lower mantle Thermoelastic models of minerals and the composition of the Earth's lower mantle

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pepi..125..147h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 125, Issue 1-4, p. 147-166.

Physics

8

Scientific paper

A thermoelastic model for polycrystalline solids is presented extending our previous work. The model describes consistently thermoelastic properties such as the equations of state and the compressional and shear velocities vp and vs of MgSiO3 and CaSiO3 perovskites and (Mg, Fe)O magnesiowüstite under high pressure and/or high temperature. The values of the parameters in the model are determined from experimental data. A number of the model compositions of the (upper) mantle have been proposed by several researchers where the compositions are specified by the wt.% of five major oxides, SiO2, MgO, FeO, Al2O3, and CaO. From these model compositions, we have derived the model aggregates for the lower mantle assuming that the lower mantle consists of a homogeneous three-component aggregate of (Mg1-x-u, Fex, Alu)(Si1-u, Alu)O3 perovskite, (Mg1-y, Fey)O magnesiowüstite, and CaSiO3 perovskite. Using our model, we have calculated density, bulk and shear moduli, and vp and vs of these aggregates under lower mantle conditions as a function of depth /z. The temperature /T(z) is calculated assuming that the lower mantle is adiabatic and T(670km)=1873K and the nonadiabatic effect is incorporated perturbatically following the work of Shankland and Brown. We have found that the chondritic model and the lower mantle model both by Anderson and Bass are in excellent agreement with preliminary reference earth model (PREM). Our results show that the elastic relaxation effect due to long-time-scale mantle convection is relatively small in the lower mantle.

Affiliated with

Also associated with

No associations

Rating

Thermoelastic models of minerals and the composition of the Earth's lower mantle 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 Thermoelastic models of minerals and the composition of the Earth's lower mantle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermoelastic models of minerals and the composition of the Earth's lower mantle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1007023