摘要
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 electrical conductance of NaCl solution was measured at 0. 25-3. 75 GPa and 20-370℃. The results show that:(1) the conductance increases with the temperature, and there is a linear relation between the logarithm of the conductance and the reciprocal of the temperature, but their slopes are different at different pressures; (2) the relation of the conductance with the pressure is rather complex and there are some discontinuities between the conductance and the pressure, that is, the conductance increases with the pressure in the range of 2. 25-3. 75 GPa, but almost doesn't change with the pressure in the range of 1. 25-2. 00 GPa, and the conductance at 0. 75 GPa is higher than that at the nearby pressures. This indicates that the NaCl solution has quite different electrochemical properties at different pressures, and probably is an important cause for the existence of the high-conductance layer in the lower crust and the low-velocity layer in the upper mantle.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1997年第3期274-280,共7页
Acta Geologica Sinica
基金
国家自然科学基金(编号49573192
49603049)
关键词
高温
高压
电导率
低速高导层
氯化钠溶液
high temperature and high pressure, NaCl solution, electrical conductance, low-velocity and high-conductance layer
