摘要
在 1 .0～2 .0GPa和 3 2 0～ 70 0℃下 ,1 2～ 1 0 5Hz的频率范围内 ,进行了辉长岩的电导率就位测量 ,并用阻抗谱分析了其微观电传导机制。结果表明 ;电导率对测量频率具有依赖性。复阻抗平面上只出现了反映颗粒内部传导机制的阻抗弧 ,在高压下这种机制起主导作用 ,该阻抗弧出现在 1 0 5～n×1 0 2 Hz(n为 1～9的正整数 )的频率范围内。以本实验所获得的电导率结果和前人的工作为依据得出辉长岩不能在中下地壳形成高导层的结论。
The electric conductivity of gabbro has been measured at 1.0～2.0 GPa and 320～700℃, and the conduction mechanism has been analyzed in terms of the impedance spectra. Experimental results indicated that the electric conductivity depends on the frequency of alternative current. Impedance arcs representing the conduction mechanism of grain interiors are displayed in the complex impedance plane, and the mechanism is dominated at high pressure. These arcs occur over the range of 10 2～ n ×10 5 Hz( n is the positive integer from 1 to 9). On the basis of our results and previous work, it is concluded that gabbro can't form any high conductivity layer (HCL) in the middle lower curst.
出处
《矿物学报》
CAS
CSCD
北大核心
2002年第1期81-84,共4页
Acta Mineralogica Sinica
基金
国家"攀登"预选项目 (95 预 3 9)
国家自然科学基金项目 (批准号 :496742 2 1)
关键词
高温
高压
辉长岩
导电机制
电导率
高导层
阻抗谱分析
high temperature and pressure
gabbro
conduction mechanism
electrical conductivity
HCL
