EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Stable and clumped isotope characterization of travertine spring mounds from Santovka and Dudince (Southern Slovakia)

Daniella Vieira1, László Rinyu2, and Sándor Kele3
Daniella Vieira et al.
  • 1Department of Earth Sciences, Eötvös Loránd University, Budapest, Hungary
  • 2Isotope Climatology and Environmental Research Centre (ICER), Institute for Nuclear Research, Debrecen, Hungary
  • 3Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Budapest, Hungary

Carbon, oxygen and clumped isotope (Δ47) values were measured from recently inactive travertine mounds located in Santovka and Dudince (Slovakia) to provide information about the origin of carbon, precipitation conditions, and paleotemperature. δ18O and δ13C analyses of carbonates were performed at the Institute for Geological and Geochemical Research (IGGR), Research Centre for Astronomy and Earth Sciences (Budapest, Hungary) and the clumped isotope analysis were performed at the Isotope Climatology and Environmental Research Center (ICER) of the Institute for Nuclear Research (Debrecen, Hungary). δ13C values show a range between +5.3‰ and +9.7‰ (V-PDB) and δ18O values (V-PDB) range between –11.2‰ and −7.5‰. These data are in accordance with the typical isotopic signature of thermogene travertines. Positive δ13C values also suggest that the thermal waters were charged with isotopically heavy CO2 of deep origin, possibly produced through metamorphic reactions, as decarbonation of carbonate rocks. Calculated δ13CCO2 values of −4.2% to −0.9‰, more positive than values of CO2 coming from the pure igneous source possibly, support this suggestion. Mineral and thermal waters in Slovakia are mainly observed in the Inner Carpathians depressions and lowland, making the most plausible carbon sources as being the Triassic limestones and dolomites, where the aquifers were formed. Clumped isotope composition (Δ47) of the inactive Santovka Mound and two inactive mounds from Dudince were measured. D47(CDES 25) values range from 0.646 ± 0.012‰ and 0.717 ± 0.010‰, corresponding to temperature estimates (T(Δ47)) that range from 17°C to 43°C using the calibration of Petersen et al. (2019) and 12°C to 33°C, using Kele et al. (2015) calibration. Calculated paleotemperatures of the paleosprings are slightly higher than the present equivalents measured directly in thermal water wells from Santovka and Dudince (14.5 °C to 26.9°C). δ18O (V-PDB) of the travertine precipitating fluid was calculated using the T(Δ47) data, giving values on the range of –11.1‰ and −5.8‰, while the δ18Owater values measured from thermal water well on Santovka and Dudince vary from –11.3‰ to 10.1‰ The observed difference in the δ18Owater values could be interpreted as the influence of the present-day precipitation (–10.4‰ to –8.7‰) on the waters on this region.

How to cite: Vieira, D., Rinyu, L., and Kele, S.: Stable and clumped isotope characterization of travertine spring mounds from Santovka and Dudince (Southern Slovakia), EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-7556,, 2022.