Stable isotope study in a weakly developed paleosol horizon in the quaternary Vár-hegy travertine (Budapest, Hungary)

Bernadett Bajnóczi, A. Demény, László Korpás

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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 (δ13C = -0.6 to 2.1‰ and δ18O = -16.7 to -12.9‰) are very close to the compositions of the host travertine (δ13C = 1.1 to 2.1‰ and δ18O = -17.7 to -13.7‰, and differ from the probable isotope composition of pedogenic carbonate (δ13C 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.

Original languageEnglish
Pages (from-to)149-160
Number of pages12
JournalActa Geologica Hungarica
Volume46
Issue number2
DOIs
Publication statusPublished - 2003

Fingerprint

travertine
paleosol
stable isotope
cavity
fill
carbonate
carbon isotope
oxygen isotope
isotope
ferrihydrite
reworking
clast
calcite
clay
soil

Keywords

  • Isotope
  • Needle-fiber calcite
  • Paleosol
  • Quaternary
  • Travertine

ASJC Scopus subject areas

  • Geology

Cite this

Stable isotope study in a weakly developed paleosol horizon in the quaternary Vár-hegy travertine (Budapest, Hungary). / Bajnóczi, Bernadett; Demény, A.; Korpás, László.

In: Acta Geologica Hungarica, Vol. 46, No. 2, 2003, p. 149-160.

Research output: Contribution to journalArticle

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