Geochemical Characteristics Of Greek Thermal Springs

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Journal Article: Geochemical Characteristics Of Greek Thermal Springs

A systematic sampling of all known thermal springs and gas emissions of continental Greece has been carried out. The main gas and water composition, and some trace elements in liquid phase (SiO2, H3BO3, NH4+ and Li+) have been determined. The chemical composition of most thermal springs analyzed is typical of deep Na-HCO3 rising hot waters which circulate in CO2-rich silicic formations, and which acquire progressively a Na-Cl composition by admixing of colder shallower saline connate waters housed in the rock matrix of marine post-orogenic Tertiary-Quaternary sediments. On the whole the thermal manifestations of continental Greece can be fitted in a tectonic framework where high hydraulic gradients enable waters in hot deep aquifers to reach the surface rapidly along fault systems at the boundary of N-S- and E-W-trending Tertiary basins. Equilibration temperatures of 80-120°C in the main storage zone (130-150°C max in the Nestos-Xanthi basin) have been assessed for most of the study area. High N2 and low H2 and H2S content in gas emissions associated to water samples are consistent with temperatures assessed by using geothermometers in liquid phase.

Angelo Minissale, Vittorio Duchi, Niko Kolios and Giovanni Totaro

Published Journal 
Journal of Volcanology and Geothermal Research, 1989

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Angelo Minissale,Vittorio Duchi,Niko Kolios,Giovanni Totaro. 1989. Geochemical Characteristics Of Greek Thermal Springs. Journal of Volcanology and Geothermal Research. (!) .