Electrical Conductivity of Olivine-Synthetic Melt Rock

小行星9315935 PI将对多晶橄榄石加硅酸盐熔体岩石的电导率进行实验室调查，以阐明控制部分熔融岩石电导率的重要变量，并限制将电导率测量外推到地球深处。 简化的部分熔融地幔岩石的合成类似物将被用来系统地研究电导率对熔体分布的依赖性，熔体分布是温度、氧逸度和交流的函数。频率. 熔体分布的敏感性，从而电导率，熔体的体积和熔体-固体系统的界面能的变化将通过独立地改变熔体分数和熔体组合物在固定的温度和氧活性进行评估。 通过随后研究温度和氧逸度变化对频率响应的影响，电导率也将用于测量熔体迁移、平衡和离子扩散的动力学。 电子显微镜观察将把电结果与样品中的结构变化联系起来。 ****

9315935 Wanamaker The PI will perform an experimental laboratory investigation of the electrical conductivity of polycrystalline olivine plus silicate melt rocks to elucidate the variables important in controlling conductivity in partially molten rocks and to constrain extrapolation of conductivity measurements to the deep earth. Synthetic analogues of simplified partially molten mantle rocks will be used to study systematically the dependence of electrical conductivity on melt distribution as a function of temperature, oxygen fugacity, and a.c. frequency. The sensitivity of melt distribution, and thus conductivity, to changes in volume of melt and the interfacial energies of the melt-solid system will be assessed by independently varying both the melt fraction and melt composition at fixed temperature and oxygen activity. By subsequently investigating the effect of changes in temperature and oxygen fugacity on the frequency response, electrical conductivity will also be used to measure the kinetics of melt migration, equilibration, and ionic diffusion. Electron microscopy observations will link the electrical results with structural changes in the samples. ****