@article{hertelendi_veres_futó_svingor_mikó_lénárt_deák_süveges_1995, 
  title={Radiocarbon Concentration and Origin of Thermal Karst Waters in the Region of the Bükk Mountains, Northeastern Hungary}, 
  volume={37}, 
  DOI={10.1017/s0033822200031039}, 
  abstractNote={<jats:p>Karst springs are abundant in Hungary, and many are thermal (temperatures &amp;gt;30°). As thermal springs are a significant part of Hungary's water resources, it is important to quantify their travel times in the karst systems. Thus, we chose to measure T and δ<jats:sup>18</jats:sup>O in the water and δ<jats:sup>13</jats:sup>C and<jats:sup>14</jats:sup>C in dissolved inorganic carbon (DIC) in water from 50 thermal and nonthermal springs and wells in the Bükk Mountains, northeastern Hungary. Environmental isotope data confirm the karst water-flow pattern implied by earlier studies. We found the water in warm springs and boreholes to be mixtures of cold young and old thermal water. We also determined short mean-residence times for some large cold springs. The<jats:sup>14</jats:sup>C activities measured in these springs indicate that the recharge area of the karst aquifer is open to the atmosphere, and atmospheric CO<jats:sub>2</jats:sub>contributes to the<jats:sup>14</jats:sup>C activity of these groundwaters. We observed good correlation between<jats:sup>14</jats:sup>C and<jats:sup>3</jats:sup>H activities and we determined negative correlations between<jats:sup>14</jats:sup>C concentration and δ<jats:sup>13</jats:sup>C values and temperature. From the δ<jats:sup>18</jats:sup>O values of the oldest thermal waters, we attribute their origin to precipitation during colder temperatures than at present.</jats:p>}, 
  number={02}, 
  publisher={Cambridge University Press (CUP)}, 
  author={Hertelendi and Veres and Futó and Svingor and Mikó and Lénárt and Deák and Süveges}, 
  year={1995}
  }