On the increase in thermal diffusivity caused by the perovskite to post-perovskite phase transition and its implications for mantle dynamics

On the increase in thermal diffusivity caused by the perovskite to post-perovskite phase transition and its implications for mantle dynamics
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钙钛矿到后钙钛矿相变引起的热扩散率的增加及其对地幔动力学的影响

DOI:
10.1016/j.epsl.2011.12.009
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发表时间:
2012
影响因子:
5.3
通讯作者:
Hunt S
Hunt S
中科院分区:
地球科学1区
文献类型:
--
作者:
Hunt S

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使用 X 射线照相 Ångström 方法,在高压和高达 600°C 的温度下测量了钙钛矿和后钙钛矿 CaIrO3 的热扩散率 (κ)。在高温下,我们发现在研究的温度范围内后钙钛矿的热扩散率略低于等化学钙钛矿的两倍。假设类似的效应发生在 MgSiO3 后钙钛矿中,则使用简单的二维对流模型研究了钙钛矿和后钙钛矿之间的对比热传输特性对地幔动力学的影响。这些结果表明,与参考常数 a 情况相比,后钙钛矿透镜体的范围减小、深度增加,以及核-地幔边界热通量增加、更广泛的上升流和更剧烈的下降流。
The thermal diffusivity (κ) of perovskite and post-perovskite CaIrO3has been measured, at elevated pressure and temperatures up to 600°C, using the X-radiographic Ångström method. At high temperatures we find that the thermal diffusivity of post-perovskite is slightly below twice that of isochemical perovskite over the temperature range investigated. Assuming a similar effect occurs in MgSiO3post-perovskite, the effect of the contrasting thermal transport properties between perovskite and post-perovskite on mantle dynamics has been investigated using simple two-dimensional convection models. These show a reduction in extent and increase in depth of post-perovskite lenses, as well as increased core–mantle-boundary heat-flux, broader upwellings and more vigorous downwellings when compared to the reference, constant a, case.
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