%0 Journal Article
%T 硅酸盐熔体电导率实验研究及其对地球内部熔融的启示
%A 倪怀玮
%A 郭璇
%J 中国科学技术大学学报
%D 2017
%R 10.3969/j.issn.0253-2778.2017.02.006
%X 由于硅酸盐熔体的电导率比固相矿物显著提高，地球内部的熔融区域(如岩浆房)在大地电磁测深获得的电性结构中表现出电导率异常．为了制约这些区域的物理化学条件(如熔体比例和熔体的水含量)，迫切需要不同成分硅酸盐熔体在各种温度、压力和水含量条件下的电导率测量数据．本文总结了硅酸盐熔体电导率实验研究的进展，指出Na离子和水的含量是影响熔体电导率的关键因素，并以大洋软流圈低速带和长白山天池火山岩浆房为例介绍了实验结果的应用．未来潜在的前沿研究方向包括测量超临界流体(可视为一种高度富水的特殊硅酸盐熔体)的电导率，以及利用电导率突变确定岩石的熔融温度．</br>Abstract：As silicate melts are electrically more conductive than solid minerals, molten zones in Earth’s interior, such as magma chambers, show anomalies in electrical structure inversed from magnetotelluric survey. To constrain the physicochemical conditions, such as melt fraction and H2O concentration in the melt, of the molten zones, experimental data are urgently needed as to the electrical conductivity of the various silicate melts at different temperatures, pressures and H2O concentrations. This paper reviews the progress in experimental studies of electrical conductivity of silicate melts. The concentration of Na+ and that of H2O are the key factors in controlling electrical conductivity. Two applications include the oceanic asthenospheric low-velocity zone and the magma chamber beneath the Tianchi Volcano, Changbai Mountain. Potential future research directions include electrical investigation of supercritical fluids, which could be deemed as a special type of H2O-rich silicate melt, and determination of melting temperature by using jump in electrical conductivity as an index.
%K 硅酸盐熔体
%K 电导率
%K 部分熔融
%K 岩浆房&lt
%K /br&gt
%K Key words： silicate melt electrical conductivity partial melting magma chamber
%U http://just.ustc.edu.cn/CN/abstract/abstract136.shtml