CONDUCTIVITY OF NACL SOLUTION AT 0.4-5.0 GPA AND 25-500-DEGREES-C

NaCl-H2O is the most fundamental ternary system in geology. Until now, the measurements of electrical conductivity of NaCl solutions are sti ll little at high pressures (>0.5 GPa). We measured the conductivity o f 0.01 m NaCl solution at 0.4-5.0 GPa and 25-500 degrees C. The result s are consistent with that of Quist and Marshall (1968) at 0.4 GPa. Th e conductivity of NaCl solution increases with increasing temperature. The results also show that the conductivity of NaCl solution changes little with increasing pressure below 1.5 GPa and changes rapidly with increasing pressure above 1.5 GPa. The rapid increase of the conducti vity of NaCl solution may play an important role in many geological pr ocesses (such as the genesis of ore deposits under hydrothermal condit ion) and other fields.