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, L. Fodor, Katalin Judik, Tibor Németh, K. Balogh, S. 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 2009

Fingerprint

folds (geology)
stacking
nappe
sediments
Jurassic
histories
history
sediment
Triassic
foliation
oceans
kink bands
metamorphism
kink band
Cretaceous
sandstones
basements
black shale
ductile deformation
thrust

Keywords

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

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

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title = "Deformation history and nappe stacking in Rudab{\'a}nya Hills (Inner Western Carpathians) unravelled by structural geological, metamorphic petrological and geochronological studies of Jurassic sediments",
abstract = "Several Jurassic tectonic units of the Rudab{\'a}nya 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 Telekesv{\"o}lgy, and the Triassic B{\'o}dva series were only affected by diagenetic (partly anchimetamorphic) alteration. The metamorphosed Jurassic complexes thrust upon the Telekesv{\"o}lgy-B{\'o}dva 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.",
keywords = "Illite K{\"u}bler index, K-Ar geochronology, K-white mica geobarometry, Low grade metamorphism, Nappe stacking, Western Carpathians",
author = "Szilvia K{\"o}v{\'e}r and L. Fodor and Katalin Judik and Tibor N{\'e}meth and K. Balogh and S. Kov{\'a}cs",
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T1 - Deformation history and nappe stacking in Rudabánya Hills (Inner Western Carpathians) unravelled by structural geological, metamorphic petrological and geochronological studies of Jurassic sediments

AU - Kövér, Szilvia

AU - Fodor, L.

AU - Judik, Katalin

AU - Németh, Tibor

AU - Balogh, K.

AU - Kovács, S.

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AB - 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.

KW - Illite Kübler index

KW - K-Ar geochronology

KW - K-white mica geobarometry

KW - Low grade metamorphism

KW - Nappe stacking

KW - Western Carpathians

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