Thermoelasticity of Silicate Perovskite and Magnesiowustite and Stratification of the Earth's Mantle.
Science
; 257(5073): 1099-101, 1992 Aug 21.
Article
en En
| MEDLINE
| ID: mdl-17840278
ABSTRACT
Analyses of x-ray-diffraction measurements on (Mg,Fe)SiO(3) perovskite and (Mg,Fe)O magnesiowüstite at simultaneous high temperature and pressure are used to determine pressure-volume-temperature equations of state and thermoelastic properties of these lower mantle minerals. Detailed comparison with the seismically observed density and bulk sound velocity profiles of the lower mantle does not support models of this region that assume compositions identical to that of the upper mantle. The data are consistent with lower mantle compositions consisting of nearly pure perovskite (>85 percent), which would indicate that the Earth's mantle is compositionally, and by implication, dynamically stratified.
Buscar en Google
Colección:
01-internacional
Banco de datos:
MEDLINE
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Science
Año:
1992
Tipo del documento:
Article