The effect of pressure on thermal diffusivity in pyroxenes
The effect of pressure on thermal diffusivity in pyroxenes
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DOI：
10.1180/minmag.2011.075.5.2597
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发表时间：
2011-10
影响因子：
2.7
通讯作者：
S. Hunt;S. Hunt;A. Walker;R. McCormack;D. Dobson;A. Wills;Li Li-Li
中科院分区：
文献类型：
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作者：
S. Hunt;S. Hunt;A. Walker;R. McCormack;D. Dobson;A. Wills;Li Li-Li
摘要：采用Ångström x射线照相法测定了透辉石、硬玉和长辉石在高达7 GPa和1200 K的同时压力和温度下的热扩散率。测量结果表明，辉石热扩散系数的压力依赖性明显大于橄榄石或石榴石，在俯冲板的morb层中，辉石热扩散系数是橄榄石的1.5倍。所有数据集的温度依赖关系由一个拟合1/K的低阶多项式很好地描述，压力依赖关系在1/K下呈指数关系，其公式与热性能的阻尼谐振子模型一致。
Abstract The thermal diffusivity of diopside, jadeite and enstatite were measured at simultaneous pressures and temperatures of up to 7 GPa and 1200 K using the X-radiographic Ångström method. The measurements herein show that the pressure dependency of thermal diffusivity in pyroxenes is significantly greater than in olivine or garnet and that in the MORB-layer of a subducting slab the thermal diffusivity of pyroxenes are a factor of 1.5 greater than that of olivine. The temperature dependence of all the data sets is well described by a low-order polynomial fit to 1/K and the pressure dependence is exponential in 1/K, formulations which are consistent with the damped harmonic oscillator model for thermal properties.