Stixrude L, Hemley R J, Fei Y, Mao H K
Science. 1992 Aug 21;257(5073):1099-101. doi: 10.1126/science.257.5073.1099.
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.
对（Mg,Fe）SiO₃钙钛矿和（Mg,Fe）O方镁铁矿在高温高压同时作用下进行X射线衍射测量分析，以确定这些下地幔矿物的压力-体积-温度状态方程和热弹性性质。与下地幔地震观测到的密度和体声速剖面进行详细比较，并不支持假设该区域成分与上地幔相同的模型。数据与由近乎纯的钙钛矿（>85%）组成的下地幔成分一致，这表明地球地幔在成分上，进而在动力学上是分层的。
