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在0.25—3.75GPa和20—370℃条件下测量了NaCl溶液的电导率。结果表明:①电导率随温度增高而增大,且电导率的对数与温度的倒数为线性关系,但不同压力下其斜率不同。②电导率与压力的关系较为复杂,存在着不连续性。即在2.25—3.75GPa压力范围,电导率随压力增大而增大;在1.25—2.00GPa压力范围,电导率与压力几乎无关;0.75GPa压力的电导率高于相邻压力的电导率。上述电导率特征反映了不同压力下NaCl溶液具有非常不同的电化学性质,并可能是造成下地壳存在高导层和上地幔存在地震波低速层的重要原因。
The conductivity of NaCl solution was measured at 0.25-3.75 GPa and 20-370 ° C. The results show that: (1) The conductivity increases with the increase of temperature, and the logarithm of conductivity is linear with the reciprocal of temperature, but the slope is different under different pressures. ② the relationship between conductivity and pressure is more complicated, there is a discontinuity. That is, in the pressure range of 2.25-3.75GPa, the conductivity increases with the increase of pressure; in the pressure range of 1.25-2.00GPa, the conductivity has almost no relation to the pressure; the conductivity of 0.75GPa pressure is higher than the conductivity of the adjacent pressure. The above-mentioned conductivity characteristics reflect the very different electrochemical properties of NaCl solution under different pressures and may be an important reason for the existence of low velocity seismic layers in the upper crust and the upper mantle.