Deformation history and nappe stacking in Rudabánya Hills (Inner Western Carpathians) unravelled by structural geological, metamorphic petrological and geochronological studies of Jurassic sediments

Szilvia Kövér, László Fodor, Katalin Judik, Tibor Németh, Kadosa Balogh, Sandor Kovács

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Several Jurassic tectonic units of the Rudabánya Hills (Inner Western Carpathians) were studied by structural geological, metamorphic petrological and geochronological methods, in order to unravel its deformation history and nappe stacking. Three series showing pronounced lithostratigraphic similarities (black shale, sandstone turbidite and olisthostrome) are interpreted to be subunits of the Telekesoldal nappe. It is questionable whether a Triassic basement can be associated with these Jurassic rocks. Metamorphic petrological data indicate metamorphism at the transition between the high-temperature anchizone and epizone (300-350°C and 2-2.5 kbar pressure). These series were affected by three events of ductile deformation including in order 1) layer-parallel foliation, 2) folding with axial plane foliation and 3) kink bands. K-Ar ages suggest that the main detected metamorphic event took place about 137-117 Ma ago. In contrast, the uppermost Triassic-Jurassic Telekesvölgy, and the Triassic Bódva series were only affected by diagenetic (partly anchimetamorphic) alteration. The metamorphosed Jurassic complexes thrust upon the Telekesvölgy-Bódva sequence as a separate nappe at 87-94 Ma as suggested by K-Ar data. The metamorphism and deformation of these Jurassic series are suggested to appear simultaneously with the Middle Jurassic-earliest Cretaceous subduction of the Meliata branch of the Neotethys Ocean. Post-metamorphic deformation, including nappe emplacement seems to be coeval with mid-Cretaceous deformations of other Inner Western Carpathian units. The latter is probably related to the closure of the Penninic-Vahic Ocean farther to the north.

Original languageEnglish
Pages (from-to)3-29
Number of pages27
JournalGeodinamica Acta
Volume22
Issue number1-3
DOIs
Publication statusPublished - Jan 1 2009

Keywords

  • Illite Kübler index
  • K-Ar geochronology
  • K-white mica geobarometry
  • Low grade metamorphism
  • Nappe stacking
  • Western Carpathians

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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