六面顶压机高温高压弹性波速测量装置样品室温度梯度的校正

 大腔体六面顶压机波速测量装置的样品室内存在着较大的温度梯度。根据实验观测的样品室内的温度分布数据和在一定温度条件下波速随温度升高呈线性变化的特征，运用理论分析和计算相结合的方法对样品的弹性波速进行了校正。以斜长角闪岩为例，对其实验测量的纵波速度（v_P）进行了校正，并与原来的数据作了对比：波速校正量绝对值随着温度的升高逐渐增大；在2.0 GPa、530 ℃时，样品X和样品Y校正后的v_P比未校正的v_P分别减小了0.270 km/s（3.3%）和0.118 km/s（1.5%）。这种方法明显地提高了波速测量结果的精度，有助于更准确地进行地球物理资料的解释。     

Evidence for Grain Boundary Transport from Impedance Spectroscopy of Gabbro at 1－2GPa up to 890℃

Impedance spectra of gabbro were measured at 1-2 GPa and up to 890℃ with applied frequency of 12 to 10^5 Hz. At temperatures below 680℃, only one impedance arc corresponding to the grain interior conduction process occurs. Owing to the grain boundary transport with increasing temperature, the impurities occur at the grain boundaries, resulting in the second arc corresponding to the grain boundary conduction process over the frequency range of 12 to 10^3Hz above 680℃, and the resistivities of the grain interior and the grain boundary conduction mechanisms add in series. The total conductivity of this rock is dominated by the grain interior conductivity and the impurities have no significant effect on the total electrical conductivities.