Abstract
Forty-five Tunisian hot springs are studied as geothermal indicators. Several chemical geothermometers are applied in this sedimentary geological environment. Hot springs are selected among 70 existing within the country. Selection is based on complete water analyses with a good ionic balance. Measured temperature ranges from 21 to 73°C and discharge rates range from 0.1 to 40 l/s. Studied springs show mainly chloride type waters. Geothermometers applied are: silica, Na/K, NaKCa, NaKCaMg, Na/Li and Mg/Li. Temperatures estimated by those geothermometers are plotted against the measured values to evaluate the applicability of the geothermometers used. The Na/K and Na/Li geothermometers appear to give unreliable results, as water composition seems to be greatly affected by interaction with the evaporitic and dolomitic rocks that are ubiquitous in Tunisia. The NaKCaMg, Mg/Li and silica geothermometers seem to give plausible values, emphasizing the role played by Mg and its importance for Tunisian hot waters.
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