A multi-system geochronology in the Ad-3 borehole, Pannonian Basin (Hungary) with implications for dating volcanic rocks by low-temperature thermochronology and for interpretation of (U-Th)/He data

Martin Danišík, L. Fodor, István Dunkl, Axel Gerdes, János Csizmeg, Mária Hámor-Vidó, Noreen J. Evans

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Independent geochronological and thermal modelling approaches are applied to a biostratigraphically exceptionally well-controlled borehole, Alcsútdoboz-3 (Ad-3), in order to constrain the age of Cenozoic geodynamic events in the western Pannonian Basin and to test the efficacy of the methods for dating volcanic rocks. Apatite fission track and zircon U-Pb data show two volcanic phases of Middle Eocene (43.4-39.0 Ma) and Early Oligocene (32.72 ± 0.15 Ma) age respectively. Apatite (U-Th)/He ages (23.8-14.8 Ma) and independent thermal and subsidence history models reveal a brief period of heating to 55-70 °C at ~17 Ma caused by an increased heat-flow related to crustal thinning and mantle upwelling. Our results demonstrate that, contrary to common perception, the apatite (U-Th)/He method is likely to record 'apparent' or 'mixed' ages resulting from subsequent thermal events rather than 'cooling' or 'eruption' ages directly related to distinct geological events. It follows that a direct conversion of 'apparent' or 'mixed' (U-Th)/He ages into cooling, exhumation or erosion rates is incorrect.

Original languageEnglish
Pages (from-to)258-269
Number of pages12
JournalTerra Nova
Volume27
Issue number4
DOIs
Publication statusPublished - Aug 1 2015

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thermochronology
geochronology
volcanic rock
borehole
basin
apatite
cooling
crustal thinning
erosion rate
exhumation
heat flow
geodynamics
dating
Oligocene
Eocene
zircon
subsidence
volcanic eruption
heating
history

ASJC Scopus subject areas

  • Geology

Cite this

A multi-system geochronology in the Ad-3 borehole, Pannonian Basin (Hungary) with implications for dating volcanic rocks by low-temperature thermochronology and for interpretation of (U-Th)/He data. / Danišík, Martin; Fodor, L.; Dunkl, István; Gerdes, Axel; Csizmeg, János; Hámor-Vidó, Mária; Evans, Noreen J.

In: Terra Nova, Vol. 27, No. 4, 01.08.2015, p. 258-269.

Research output: Contribution to journalArticle

Danišík, Martin ; Fodor, L. ; Dunkl, István ; Gerdes, Axel ; Csizmeg, János ; Hámor-Vidó, Mária ; Evans, Noreen J. / A multi-system geochronology in the Ad-3 borehole, Pannonian Basin (Hungary) with implications for dating volcanic rocks by low-temperature thermochronology and for interpretation of (U-Th)/He data. In: Terra Nova. 2015 ; Vol. 27, No. 4. pp. 258-269.
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