Thermal diffusivity of olivine single‐crystals and polycrystalline aggregates at ambient conditions—a comparison
Thermal diffusivity of olivine single‐crystals and polycrystalline aggregates at ambient conditions—a comparison
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环境条件下橄榄石单晶和多晶聚集体的热扩散率比较
DOI：
10.1029/2003gl018459
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发表时间：
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影响因子：
5.2
通讯作者：
中科院分区：
文献类型：
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作者：
热传递是地幔动力学的一个重要过程。然而，上地幔物质的热输运性质的实验数据分析突出了热扩散率的绝对值的大的分散。特别地，单晶中的热传导系统地高于多晶样品。在这里，我们提出了新的热扩散率测量圣卡洛斯橄榄石单晶和地幔岩石在300 K。沿着[100]、[010]和[001]方向的橄榄石热扩散系数张量的测量分量为2.73、1.70和2.49 mm 2。s-1，分别。橄榄岩的热扩散率作为结构取向的函数的测量显示的绝对值和各向异性与岩石物理模型预测的橄榄石的晶体择优取向和上述热扩散率张量的基础上，吻合良好。这表明上地幔的热扩散率比以前对地幔岩石的测量高出50%。
Heat transfer is a key process for the mantle dynamics. However, analysis of experimental data on thermal transport properties of upper mantle materials highlights a large scatter of absolute values of thermal diffusivity. In particular, conduction of heat in single crystals is systematically higher than in polycrystalline samples. Here we present new thermal diffusivity measurements on San Carlos olivine single crystals and mantle rocks at 300K. Measured components of the olivine thermal diffusivity tensor along the [100], [010], and [001] directions are 2.73, 1.70, and 2.49 mm2. s−1, respectively. Measurements of thermal diffusivity of peridotites as a function of structural orientation show absolute values and anisotropy in good agreement with those predicted by petrophysical models based on the crystal preferred orientation of olivine and the above thermal diffusivity tensor. This suggests that the upper mantle thermal diffusivity is up to 50% higher than indicated by previous measurements on mantle rocks.
真实地幔热导率对 3-D 对流模式的影响
影响因子：
5.3
作者：
F. Dubuffet;D. Yuen;M. Rabinowicz
通讯作者：
M. Rabinowicz
影响因子：
4.6
作者：
D. Mainprice;M. Humbert
通讯作者：
D. Mainprice;M. Humbert
影响因子：
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作者：
T. Shankland;U. Nitsan;A. Duba
通讯作者：
A. Duba