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  • 1 Institute for Geochemical Research, Hungarian Academy of Sciences, Budapest, Hungary, sajgo@geochem.hu
  • 2 Geological Institute of Hungary, Budapest, Hungary, horvathi@mafi.hu
  • 3 Budapest, Hungary, karpati-zoltan@t-online.hu, vetoie3840@gmail.com
  • 4 University of Szeged, Szeged, Hungary, hetenyi@geo-u-szeged.hu
  • 5 H-1112, Budapest, Budaörsi út 45, Hungary
  • 6 H-1143, Budapest, Stefánia út 14, Hungary
  • 7 H-1032, Budapest, Kiscelli u. 18, Hungary
  • 8 H-1026, Budapest, Balogh Ádám u. 18/c, Hungary
  • 9 H-6722, Szeged, Egyetem u. 2-6, Hungary
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Abstract

The geochemical facies of Hungarian thermal waters were the object of this study. Samples were separated into groups by relative ages (δ18O values). Mature and immature subgroups were formed on the basis of dissolved (semi)volatile organic compounds. The oldest (connate) waters form one group with a small number of samples. The subgroups containing different small molecular-sized soluble aromatics differ sharply in their chemical features (sodium, hydrogen carbonate, iodine, ammonium etc. content). The origin of the organic matter may differ in the subgroups as inferred by their different δ18O values and ten times greater halogen contents.

Our results show that the decomposition of organic matter produces small molecular-sized aromatic compounds and also influences the amounts of inorganic components in thermal waters, through the increase of feldspar hydrolysis and carbonate dissolution.

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