A rózsadomb (Budapest) édesvízi mészköveinek U-Th-sorozatos kormeghatározása és stabilizotóp-geokémiai vizsgálata

Translated title of the contribution: Uranium-series dating and geochemical analysis of the travertines located on the Rózsadomb (Budapest)

Sandor Kele, Gyula Scheuer, Attila Demény, Chuan Cou Shen, Hong Wei Chiang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Travertines are ubiquitous formations in the area of Budapest, indicating strong hydrothermal activities during the Pliocene and Quaternary. They cover former terraces of the Danube River and older geomorphologic horizons; thus they are important residues for (1) dating the terraces of the Danube, (2) quantifying vertical tectonic movements (i.e. recalculating the uplift rate or incision rate of the Danube) and (3) reconstructing the relocation and development (i.e. palaeohydrogeolgy) of palaeokarstsprings. In the Rózsadomb (Rose Hill) region of Budapest more than a hundred caves and traces of cave-like formations are known and travertines are also frequently found. The cave deposits have been dated extensively, but up to now no radiometric dating has been performed on the travertines. The absence of any reliable dating of the travertine deposits has hindered research on the Danube terrace, as well as palaeoclimatic studies of these deposits. Moreover, the approaches to dating that have been applied so far have focused on the elevation of the deposits above sea level; these have resulted in incorrect age determinations. This article provides details about a complex, sedimentological and stable isotope geochemical study, and also the results of uranium-series dating of, altogether, eleven travertine occurrences located on the Rózsadomb (Törökvész út, Törökvész lejto{double acute}, Lepke köz, Detreko{double acute} u., Fillér u., Bimbó út, Barsi u., BogAr u., Szemlo{double acute}-hegy, Szo{double acute}lészeti Kutatóintézet, Apostol u.). The aim of this work was to outline the depositional environments of these occurrences and to determine the age of their deposition. Based on our observations, spring cones deposited from thermal springs at different temperatures are characteristic of the area; furthermore, according to our U-Th analyses, travertine deposition proceeded during the Middle Pleistocene (around 350 ky, BP), between Terminations VI and V. This indicates that travertine deposition was probably active during the Mindel-Riss interglacial and also during the Riss glacial (when the amount of precipitation was large enough to provide a water supply for the springs). The data demonstrate that in Hungary, even during glacial periods, humid intervals could have also occurred; these would have been favourable for the deposition of travertine. According to our dating analyses, in the area of the Rózsadomb the oldest travertines are located on the highest elevation asl., while the younger travertines are situated at lower altitudes; this implies gradual, relative decrease in the palaeokarstwater-level. The uplift rates of the Rózsadomb area calculated from the U-Th age data, and the elevation of the travertines, ranges between 0.20-0.25 mm/yr.

Original languageHungarian
Pages (from-to)293-312
Number of pages20
JournalFoldtani Kozlony
Volume141
Issue number3
Publication statusPublished - Sep 9 2011

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ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Stratigraphy
  • Palaeontology

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