Temperature profile in the lowermost mantle from seismological and mineral physics joint modeling
Temperature profile in the lowermost mantle from seismological and mineral physics joint modeling
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DOI：
10.1073/pnas.0905920106
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发表时间：
2009-12-29
影响因子：
11.1
通讯作者：
Tsuchiya, Taku
中科院分区：
文献类型：
--
作者：
Kawai, Kenji;Tsuchiya, Taku
地球核幔边界（CMB）区域的内部结构在控制地球的动力学和演化方面起着至关重要的作用。我们已经开发了一个综合模型的基础上的径向变化的剪切速度在D "层（下地幔的底部）和高P，T的主要候选矿物的弹性属性，包括后钙钛矿相变的影响。该模型显示了最低地幔的温度分布，CMB温度为3，800 +/- 200 K，这表明200-300 K的横向温度变化可以解释D“中观察到的大部分速度不均匀性。单交叉相变模型比双交叉相变模型更有利于再现观测到的地震波速度结构。
The internal structure of the core-mantle boundary (CMB) region of the Earth plays a crucial role in controlling the dynamics and evolution of our planet. We have developed a comprehensive model based on the radial variations of shear velocity in the D '' layer (the base of the lower mantle) and the high-P, T elastic properties of major candidate minerals, including the effects of post-perovskite phase changes. This modeling shows a temperature profile in the lowermost mantle with a CMB temperature of 3,800 +/- 200 K, which suggests that lateral temperature variations of 200-300 K can explain much of the large velocity heterogeneity observed in D ''. A single-crossing phase transition model was found to be more favorable in reproducing the observed seismic wave velocity structure than a double-crossing phase transition model.