Science. 1994 Jun 3;264(5164):1437-9. doi: 10.1126/science.264.5164.1437.
Recent studies have implied that (Mg, Fe)SiO(3)-perovskite, a likely dominant mineral phase in the lower mantle, may have a high melting temperature. The implications of these findings for the dynamics of the lower mantle were investigated with the use of numerical convection models. The results showed that low homologous temperatures (0.3 to 0.5) would prevail in the modeled lower mantle, regardless of the effective Rayleigh number and internal heating rates. High-temperature ductile creep is possible under relatively cold conditions. In models with low rates of internal heating, local maxima of viscosity developed in the mid-lower mantle that were similar to those obtained from inversion of geoid, topography, and plate velocities.
最近的研究表明，（镁，铁）硅氧（3）-钙钛矿，一种可能在下地幔中占主导地位的矿物相，可能具有较高的熔点。这些发现对下地幔动力学的影响是用数值对流模型进行研究的。结果表明，无论有效瑞利数和内部加热率如何，在模拟的下地幔中都将普遍存在低同源温度（0.3 至 0.5）。在相对较冷的条件下，高温韧性蠕变是可能的。在内部加热率较低的模型中，在地幔中部和下部形成了类似于从大地水准面、地形和板块速度反演得到的粘度局部最大值。
