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  • 1 Laboratory for Geochemical Research, Hungarian Academy of Sciences H-1112 Budapest, Budaörsi út 45, Hungary
  • 2 Laboratory for Geochemical Research, Hungarian Academy of Sciences H-1112 Budapest, Budaörsi út 45, Hungary
  • 3 Geological Institute of Hungary H-1143 Budapest, Stefánia út 14, Hungary
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The intraformational paleosol and calcareous muddy cavity fills interbedded in the travertine of the Vár-hegy (Castle Hill) in Budapest were analyzed for carbon and oxygen isotope compositions and compared with the isotope compositions of the host travertine. Microscopic investigations of these layers indicate mechanical reworking of the travertine and mixing with the allothigenic siliciclastic material. Micromorphological features, e.g. needle-fiber calcite, carbonate hypocoatings around pores, ferruginous precipitations and clay infillings in the paleosol and cavity fills indicate that in situ pedogenic processes were active in both layers. The presence of ferrihydrite in the A horizon of the paleosol also supports pedogenic alteration. The stable carbon and oxygen isotope compositions of bulk carbonate of paleosol and cavity fills (d13C= -0.6 to 2.1‰ and d 18O= -16.7 to -12.9‰) are very close to the compositions of the host travertine (d 13C=1.1 to 2.1‰ and d 18O = -17.7 to -13.7‰,) and differ from the probable isotope composition of pedogenic carbonate (d 13C values around -11‰). These results indicate that the studied paleosol and cavity fills have only minor pedogenic component (authigenic carbonate content up to 20%); thus the paleosol represents a weakly developed soil, mostly composed of travertine clasts and allothigenic siliciclastic material.

  • Cerling, T.E. 1984: The stable isotope composition of modern soil carbonate and its relationship to climate. - Earth and Planetary Science Letters, 71, pp. 229--240.

    'The stable isotope composition of modern soil carbonate and its relationship to climate. ' () 71 Earth and Planetary Science Letters : 229 -240.

    • Search Google Scholar
  • Cerling, T.E., J. Quade, Y. Wang, J.R. Bowman 1989: Carbon isotopes in soils and palaeosols as ecology and palaeoecology indicators. - Nature, 341, pp. 138--139.

    'Carbon isotopes in soils and palaeosols as ecology and palaeoecology indicators. ' () 341 Nature : 138 -139.

    • Search Google Scholar
  • Deines, P. 1980: The isotopic composition of reduced organic carbon. - In: Fritz, P., J.C. Fonts (Eds): Handbook of environmental isotope geochemistry. Vol. I, Elsevier, Amsterdam, pp. 329--406.

    The isotopic composition of reduced organic carbon. , () 329 -406.

  • Ford, T.H., H.M. Pedley 1996: A review of tufa and travertine deposits of the world. - Earth-Science Reviews, 41, pp. 117--175.

    'A review of tufa and travertine deposits of the world. ' () 41 Earth-Science Reviews : 117 -175.

    • Search Google Scholar
  • Jánossy, D. 1986: Pleistocene Vertebrate faunas of Hungary. - Akadémiai Kiadó, Budapest, 208 p.

    Pleistocene Vertebrate faunas of Hungary. , () 208.

  • Korpás, L. 1998: Palaeokarst studies in Hungary. - Occasional Papers of the Geological Institute of Hungary, 195, 139 p.

    Palaeokarst studies in Hungary. , () 139.

  • Korpás, L., P. Kovács-Pálffy, M. Lantos, M. Földvári, L. Kordos, E. Krolopp, D. Stüben, Zs. Berner (in press): Sedimentology, geochemistry, chronology and palaeokarst evolution of a Quaternary thermal lacustrine travertine. An integrated case study from the Vár-hegy, Budapest, Hungary. - Karsztfejl\H{o}dés, VII (In Hungarian.)

  • Krolopp, E., F. Schweitzer, Gy. Scheuer, Gy. Dénes, L. Kordos, I. Skoflek, D. Jánossy 1976: Quaternary formations of the Vár-hegy in Buda. - Földtani Közlöny, 106/3, pp. 193--228. (In Hungarian.)

    'Quaternary formations of the Vár-hegy in Buda. ' () 106/3 Földtani Közlöny : 193 -228.

    • Search Google Scholar
  • McCrea, J.M. 1950: On the isotopic chemistry of carbonates and a paleotemperature scale. - Journal of Chemical Physics, 18, pp. 849--857.

    'On the isotopic chemistry of carbonates and a paleotemperature scale. ' () 18 Journal of Chemical Physics : 849 -857.

    • Search Google Scholar
  • Philips, S.E., P.G. Self 1987: Morphology, crystallography and origin of needle-fibre calcite in Quaternary pedogenic calcretes of South Australia. - Australian Journal of Soil Research, 25, pp. 429--444.

    'Morphology, crystallography and origin of needle-fibre calcite in Quaternary pedogenic calcretes of South Australia. ' () 25 Australian Journal of Soil Research : 429 -444.

    • Search Google Scholar
  • Schweitzer, F., Gy. Scheuer 1995: Hungarian travertines. - Acta Universitatis Szegediensis, Acta Geographica, 34, Special Issue, pp. 163--186.

    'Hungarian travertines. ' () Acta Geographica, 34, Special Issue Acta Universitatis Szegediensis : 163 -186.

    • Search Google Scholar
  • Schwertmann, U., R.M. Taylor 1989: Iron oxides. - In: Dixon, J.B., S.B. Weed (Eds): Minerals in soil environment. 2nd edition. Soil Science Society of America Book Series no. 1, Madison, Wisconsin, pp. 379--438.

    Iron oxides. , () 379 -438.

  • Verrecchia, E.P., K.E. Verrecchia 1994: Needle-fiber calcite: a critical review and a proposed classification. - Journal of Sedimentary Research, A 64/3, pp. 650--664.

    'Needle-fiber calcite: a critical review and a proposed classification. ' () A 64/3 Journal of Sedimentary Research : 650 -664.

    • Search Google Scholar
  • Becze-Deák, J., R. Langohr, E.P. Verrecchia 1997: Small scale secondary CaCO3 accumulations in selected sections of the European loess belt. Morphological forms and potential for paleoenvironmental reconstruction. - Geoderma, 76, pp. 221--252.

    'Small scale secondary CaCO3 accumulations in selected sections of the European loess belt. Morphological forms and potential for paleoenvironmental reconstruction. ' () 76 Geoderma : 221 -252.

    • Search Google Scholar