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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-k×10+5 Hz (k is the positive integer from 1 to 9). On the basis of our results and previous work, it is concluded that gabbro cannot form any high conductivity layer (HCL) in the middle|lower crust.
The electric conductivity of gabbro has been measured at 1.0-2.0 GPa and 320-700 ° C, 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 presenting the conduction mechanism of grain interiors are dominated at high pressure. The arcs occur over the range of 10 + 2-k × 10 + 5 Hz (k is the positive integer from 1 to 9). On the basis of our results and previous work, it is commission that gabbro can not form any high conductivity layer (HCL) in the middle | lower crust.