A geothermal solution containing appreciable amounts of sodium chloride or other salts is called________.

A geothermal solution containing appreciable amounts of sodium chloride or other salts is called Brine 
A salt solution with a high percentage of water(typically sodium chloride) is called brine. Brine can refer to salt solutions in a variety of circumstances, with the lowest concentrations being around 3.5% (a typical concentration of seawater), and the highest being about 26%. (a typical saturated solution, depending on temperature).