Hungarian Academy of Sciences (HAS)

Hungarian Geological Society

Geochemistry and Paleoclimate (G and P) Research Group

Momentum (Lendület) Paleoclimate 2ka Research Group

Archeometry Research Group



  Institute / Organization / People / Facilities / History / Library            





senior research fellow

phone: +361 309 2600 / ext 1371

fax: +361 319 3137


room:  222




Main research interest

  • - Stable- and clumped isotope geochemistry of carbonates
  • - Study of recent travertine depositing hot spring systems, calcite-water and aragonite-water oxygen isotope fractionation and calibration issues
  • - Paleoclimatology (based on travertines, tufas and speleothems)
  • - Geochemistry of dolomites, soil carbonates, tree rings, …

Curriculum vitae - [pdf]

Place and date of birth:  Nagykanizsa, 1979


  • - 2014- :Institute for Geological and Geochemical Research , HAS, Budapest, Hungary
  • - 2013-2014:ETH Zürich , Zürich, Switzerland (SCIEX postdoctoral fellowship)
  • - 2005-2013:Institute for Geochemical Research , HAS, Budapest, Hungary
  • - 2004-2005:SCK·CEN (Belgian Nuclear Research Centre), MOL, Belgium (MÖB scholarship)
  • - 2003-2004: Laboratory for Geochemical Research , Hungarian Academy of Sciences (HAS), Budapest, Hungary


  • - 2009: PhD . Eötvös Loránd University, Budapest.
  • - 2003: MSc in Geology, Eötvös Loránd University, Budapest

Membership in scientific organisations:

  • - International Association of Sedimentologists (2014-)
  • - European Association of Geochemistry (2011-)
  • - Hungarian Academy of Sciences, member (2011-)
  • - Hungarian Hydrological Society (2010-)
  • - European Geosciences Union (2008-)
  • - Society for Sedimentary Geology (2005-)
  • - European Society for Isotope Research (2004-)
  • - Hungarian Geological Society (1997-)

Referee service:

Nature Scientific Reports, Science Advances, Geochimica et Cosmochimica Acta, Chemical Geology, Sedimentology, Sedimentary Geology, Quaternary International, Quaternarie, International Journal of Earth Sciences, Journal of African Earth Sciences, Central European Geology, Earth Sciences Research Journal, Central European Journal of Geosciences, ERC…

Ongoing research projects:

  • - KH-125584 (NKFI) (2017-2019). Reconstruction of palaeotemperature based on stable- and clumped isotope geochemistry of freshwater carbonates (Project leader: Sándor Kele)
  • - Travertine Reservoir Analogue Studies ( TraRAS ), (2014-2017). Project leader: Rudy Swennen, KU Leuven, Belgium; Hungarian coordinator: Sándor Kele)

Awards and scholarships:

  • - 2018 Excellent researcher of the Research Centre for Astronomy and Earth Sciences, Award of the Hungarian Academy of Sciences
  • - 2013-2016 Bolyai János Research Scholarship of the Hungarian Academy of Sciences
  • - 2013-2014 SCIEX postdoctoral fellowship (ClumpIT, Sciex-Nr:13.071-2, ETH Zürich , Switzerland)
  • - 2012 Szádeczky-Kardoss Elemér Award
  • - 2010 Central European Geology, Best Paper Award for Young Researchers
  • - 2009 Hungarian Academy of Sciences, Young Scientist Award
  • - 2008: Scholarship of the Hungarian Academy of Sciences, (National Taiwan University, Taipei, Taiwan, 6 weeks)
  • -  2005 European Society for Isotope Research ( ESIR ) VIII. Workshop: Poster Price for Young Scientists
  • -  2004-2005 Scholarship of the Hungarian Scholarship Board (10 months, SCK·CEN, Belgian Nuclear Research Centre, MOL, Belgium)
  • -  2004 XXXIV. Meeting of Young Geologists, 3rd place
  • -  2002/2003 Grant of the Pro Renovanda Culturae Hungariae Foundation
  • -  2002/2003 Distinguished Student of the Faculty of Natural Sciences, ELTE, Budapest, Hungary
  • -  2003 National Scientific Conference of Students, Miskolc, Hungary:
    • - Sedimentology section: 1st place
    • - Paleontology section: 1st place
  • -  2002 Scientific Conference of Students, Eötvös Loránd University, Budapest, Hungary: 2nd place
  • -  2002 Erasmus scholarship (5 months, University of Florence, Italy)
  • -  2001 4th Hungarian Paleontological Regional Meeting: 3rd place in the poster session

Ongoing international collaborations:

  • Prof. Dr. Stefano Bernasconi (ETH Zürich, Switzerland)
  • Prof. Dr. Rudy Swennen (KU Leuven, Belgium)
  • Prof. Dr. Chuan-Chou Shen (National Taiwan University, Taipei, Taiwan)
  • Dr. Tobias Kluge (Institute of Environmental Physics, Heidelberg University, Germany)
  • Dr. Enrico Capezzuoli (University of Perugia, Italy)
  • Prof. Dr. Julian Andrews (University of East Anglia, Norwich, UK)
  • Prof. Dr. Mehmet Özkul (Pamukkale University, Denizli, Turkey)
  • Dr. Andrea Billi (Consiglio Nazionale delle Ricerche, CNR, Rome, Italy)
  • Dr. Gianluca Vignaroli, Gabriele Berardi (Roma Tre University, Rome, Italy)
  • Dr. Giovanna della Porta (University of Milan, Milan, Italy)
  • Dr. Christos Kanellopoulos (Institute of Geology and Mineral Exploration (IGME), Athens, Greece

Recent publications

Full list of publications

reprints: keles (at) geochem hu

Kluge, T., John, C.M., Boch, R., Kele, S. (2018) Assessment of factors controlling clumped isotopes and ?18O values of hydrothermal calcites. Geochemistry, Geophysics, Geosystems, DOI: 10.1029/2017GC006969

Kele, S., Bajnai, D. (2017) Kapcsolt izotópok (clumped isotopes) a földtudományi kutatásokban. Földtani Közlöny, 147/2, 177-194.

Haas, J., Hips, K., Budai, T., Gyori, O., Lukoczki, G., Kele, S., Demény, A., Poros, Zs. (2017) Processes and controlling factors of polygenetic dolomite formation in the Transdanubian Range, Hungary ? a synopsis. International Journal of Earth Sciences, 106 (3), 991-1021.

Claes, H., Degros, M., Soete, J., Claes, S., Kele, S., Mindszenty, A., Török, Á., El Desouky, H., Vanhaecke, F., Swennen, R. (2017) Geobody architecture, genesis and petrophysical characteristics of the Budakalász continental spring-related carbonates, Buda Hills (Hungary). Quaternary International, 437:(part A), 107-128.

Török, Á., Mindszenty, A., Claes, H., Kele, S., Fodor, L., Swennen, R. (2017) Sedimentological study and tentative reservoir characterization of the "Gazda" travertine quarry (Sütto, Gerecse Hills, Hungary). Quaternary International, 437:(part a), 164-185.

Brogi, A., Capezzuoli, E., Kele, S., Baykara, M.O., Shen, C.-C. (2017) Key tectofacies for neotectonics and palaeoseismicity reconstruction in travertine deposits as effects of hydrothermal overpressure fluids injection. Journal of the Geological Society, 174 (4), 679-699.

Billi, A., Berardi, G., Gratier, J.P., Rossetti, F., Vignaroli, G., Baykara, M.O., Bernasconi, S.M., Kele, S., Soligo, M, De Filippis, L., Shen, C.-C. (2017) First records of syn-diagenetic non-tectonic folding in quaternary thermogene travertines caused by hydrothermal incremental veining. Tectonophysics, 700-701, 60-79.

Billi, A., Berardi, G., Gratier, J.P., Rossetti, F., Vignaroli, G., Baykara, M.O., Bernasconi, S.M., Kele, S., Soligo, M, De Filippis, L., Shen, C.-C. (2017) Reply to the comment on ”First records of syn-diagenetic non-tectonic folding in quaternary thermogene travertines caused by hydrothermal incremental veining” by Bili et alii. Tectonophysics, 721, 501-512.

Koltai, G., Spötl, C., Shen, C.-C., Z. Rao, Wu., Palcsu, L., Kele, S., Surányi, G., Bárány-Kevei, I. (2017) A penultimate glacial climate record from southern Hungary. Journal of Quaternary Science, 32 (7), 946-956.

De Boever, E., Brasier, A.T., Foubert, A., Kele, S. (2017) What do we really know about early diagenesis of non-marine carbonates? Sedimentary Geology, 361, 25-41. (invited review)

Della Porta, G., Croci, A., Marini, M., Kele, S. (2017) Depositional architecture, facies character and geochemical signature of the Tivoli travertines (Pleistocene, Acque Albule Basin, Central Italy). Rivista Italiana di Paleontologia e Stratigrafia, 123:(3), 487-540.

Vignaroli, G., Berardi, G., Billi, A., Kele, S., Rossetti, F., Soligo, M., Bernasconi, S.M (2016) Tectonics, hydrothermalism, and paleoclimate recorded by Quaternary travertines and their spatio-temporal distribution in the Albegna basin, Italy: implications for the Tyrrhenian margin neotectonics. Litosphere, 8:(4) 335-358.

Berardi, G., Vignaroli, G., Billi, A., Rossetti, F., Soligo, M., Kele, S., Baykara, M.O., Bernasconi, S.M., Castorina, F., Tecce, F., Shen, C.-C. (2016) Growth of a Pleistocene giant carbonate vein and nearby thermogene travertine deposits at Semproniano, southern Tuscany, Italy. Tectonophysics, 690, 219-239.

Kele, S ., Breitenbach, S.F.M., Capezzuoli, E., Meckler, A.N., Ziegler, M., Millan, I.M., Kluge T., Deák, J., Hanselmann, K., John, C.M., Yan, H., Liu, Z., Bernasconi, S.M . (2015) Temperature dependence of oxygen- and clumped isotope fractionation in carbonates: A study of travertines and tufas in the 6-95°C temperature range. Geochimica et Cosmochimica Acta, 168, 172-192.

Soete, J., Kleipool, L.M., Claes, H., Claes, S., Hamaekers, H., Kele, S., Özkul, M., Foubert, A., Reijmer, J.J.G., Swennen, R. (2015) Acoustic properties in travertines and their relation to porosity and pore types. Marine and Petroleum Geology , 59, 320-335.

Toker, E., Kayseri-Özeri, M.S., Özkul, M., Kele, S. (2015) Depositional system and palaeoclimatic interpretations of Middle-Late Pleistocene travertines: Kocabas, Denizli, Sw-Turkey. Sedimentology , 62 (5), 1360-1383.

Hips, K., Haas, J., Poros, Zs., Kele, S., Budai, T. (2015) Dolomitization of triassic microbial mat deposits (Hungary): origin of microcrystalline dolomite. Sedimentary Geology , 318, 113-129.

Çolak Erol, S., Özkul, M., Aksoy, E., Kele, S., Ghaleb, B. (2015) Travertine occurrences along major strike-slip fault zones: Structural, depositional and geochemical constraints from the Eastern Anatolian fault System (EAFS), Turkey. Geodinamica Acta , 27, 155-174.

Laumets, L., Kalm, V., Poska, A., Kele, S., Lasberg, K., Amon, L. (2014): Palaeoclimate inferred from d 18 O and palaeobotanical indicators in freshwater tufa of Lake Äntu Sinijärv, Estonia. Journal of Paleolimnology , 51, 99-111.

Haas, J., Budai, T., Gyori, O., Kele, S. (2014): Similarities and differences in the dolomitization history of two coeval Middle Triassic carbonate platforms, Balaton Highland, Hungary. Facies , 60 (2), 581-602.

Haas, J., Budai, T., Gyori, O., Kele, S. (2014): Multiphase partial and selective dolomitisation of Carnian reef limestone (Transdanubian Range, Hungary). Sedimentology , 61 (3), 836-859.

Özkul, M., Gökgöz, A., Kele, S., Baykara, M.O., Shen, C.C., Chang,Y-W., Kaya, A., Hancer, M., Aratman, C., Akin, T., Örü, Z. (2014): Sedimentological and geochemical characteristics of a fluvial travertine: A case from the eastern Mediterranean region. Sedimentology , 61 (1), 291-318.

Özkul, M., Kele, S., Gökgöz, A., Shen, C.C., Jones, B., Baykara, M.O., Fórizs, I., Németh, T., Chang,Y-W., Alçiçek, M.C. (2013): Comparison of the Quaternary travertine sites in the Denizli extensional basin based on their depositional and geochemical data. Sedimentary Geology , 294, 179-204.

Kern, Z., Patkó, M., Kázmér, M., Fekete, J., Kele, S., Pályi, Z. (2013): Multiple tree-ring proxies (earlywood width, latewood width and d 13 C) from pedunculate oak (Quercus robur L.), Nyírség, NE Hungary. Quaternary International , 293, 257-267.

Kele, S.,  Özkul, M., Gökgöz, A., Fórizs, I., Baykara, M.O., Alçiçek, M.C., Németh, T. (2011): Stable isotope geochemical and facies study of Pamukkale travertines: New evidences of low-temperature non-equilibrium calcite-water fractionation. Sedimentary Geology , 238, 191-212.

Demény, A., Kele, S., Siklósy, Z. (2010): Empirical equations for the temperature dependence of calcite-water oxygen isotope fractionation from 10 to 70 degrees C.  Rapid Comm. Mass Spec. , 24, 3521-3526.

Sierralta, M., Kele, S. ,  Melcher, F., Hambach, U., Reinders, J., van Geldern, R., Frechen, M. (2010): Characterisation and Uranium-series dating of Travertine from Sütto in Hungary. Quaternary International , 222, 178-193.

Kele, S., Demény, A., Siklósy, Z., Németh, T., Tóth, M., B. Kovács, M., (2008): Chemical and stable isotope composition of recent hot-water travertines and associated thermal waters, from Egerszalók, Hungary: Depositional faciesand non-equilibrium fractionation Sedimentary Geology , 211, 53-72.


Last update: 02 May 2018