One of the major tasks in the exploration of geothermal resources
is to estimate subsurface temperature in the reservoir from the geochemical
and isotopic composition of thermal springs. The most commonly
used geothermometers are the silica (quartz and chalcedony),
the Na–K and the Na–K–Ca relationships (Fournier, 1973; Fournier
and Truesdell, 1973; Ellis and Mahon, 1977; D'Amore and Arnórsson,
2000). The origin of springs has also historically drawn awareness
from water scientists (LaMoreaux, 2001) and several classification
schemes have been proposed regarding special features such as average
discharge, geological setting, water geochemistry, and water temperature
(Pitts and Alfaro, 2001; Kresic, 2010)