Ductile deformation and revised lithostratigraphy of the martonyi subunit (torna unit rudabánya MTS.) Northeastern Hungary

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Abstract

New structural observations and mapping resulted in the reinterpretation of the Martonyi Subunit, part of the metamorphic Torna Unit, NE Hungary. This low-grade metamorphosed Triassic sequence contains lower Anisian Gutenstein Dolomite, a thin transitional pelagic sequence (Bódvarákó Formation?), Carnian Tornaszentandrás Slate, late Carnian-Norian Pötschen Limestone. This stratigraphy is closer to the Bódvarákó windows than to any other Torna subunits. The original sedimentation area could be located on thinned continental crust, relatively close to the oceanic crust of the Meliata branch of the Neotethys. The whole sequence suffered three phases of ductile deformation during Alpine (Cretaceous?) tectogenesis. First, layer-parallel foliation developed (D1), most probably connected to first order nappe stacking. The second deformation phase (D2) is marked by upright, chevron-type folding (D2a). Detachment faults could form at the top of the Gutenstein Dolomite in order to accommodate space problems at fold hinges. The chevron folds were flattened later, during a progressive D2b phase associated with the development of axial plane cleavage and steep reverse faults. The structural style varies depending on locations within folds and on lithology suggesting strain partitioning during the D2 phase. Small kink folds with oblique axes can be related to reactivation of steep faults with oblique slip during the D3 phase, at the transition of brittle-ductile deformation field. The whole unit was thrust upon non-metamorphic unit(s) (D4 brittle phase) due to strike-slip displacement along the Darnó Zone sensu lato during the late Cretaceous and/or Tertiary.

Original languageEnglish
Pages (from-to)355-369
Number of pages15
JournalGeologica Carpathica
Volume51
Issue number6
Publication statusPublished - 2000

Fingerprint

lithostratigraphy
ductile deformation
fold
Carnian
dolomite
Cretaceous
strain partitioning
Anisian
Norian
detachment fault
brittle deformation
slate
reverse fault
foliation
reactivation
stacking
nappe
oceanic crust
cleavage
continental crust

Keywords

  • Ductile deformation
  • Folds
  • Foliation
  • Inner western Carpathians
  • Mesozoic
  • NE Hungary
  • Strain partitioning
  • Torna unit

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

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title = "Ductile deformation and revised lithostratigraphy of the martonyi subunit (torna unit rudab{\'a}nya MTS.) Northeastern Hungary",
abstract = "New structural observations and mapping resulted in the reinterpretation of the Martonyi Subunit, part of the metamorphic Torna Unit, NE Hungary. This low-grade metamorphosed Triassic sequence contains lower Anisian Gutenstein Dolomite, a thin transitional pelagic sequence (B{\'o}dvar{\'a}k{\'o} Formation?), Carnian Tornaszentandr{\'a}s Slate, late Carnian-Norian P{\"o}tschen Limestone. This stratigraphy is closer to the B{\'o}dvar{\'a}k{\'o} windows than to any other Torna subunits. The original sedimentation area could be located on thinned continental crust, relatively close to the oceanic crust of the Meliata branch of the Neotethys. The whole sequence suffered three phases of ductile deformation during Alpine (Cretaceous?) tectogenesis. First, layer-parallel foliation developed (D1), most probably connected to first order nappe stacking. The second deformation phase (D2) is marked by upright, chevron-type folding (D2a). Detachment faults could form at the top of the Gutenstein Dolomite in order to accommodate space problems at fold hinges. The chevron folds were flattened later, during a progressive D2b phase associated with the development of axial plane cleavage and steep reverse faults. The structural style varies depending on locations within folds and on lithology suggesting strain partitioning during the D2 phase. Small kink folds with oblique axes can be related to reactivation of steep faults with oblique slip during the D3 phase, at the transition of brittle-ductile deformation field. The whole unit was thrust upon non-metamorphic unit(s) (D4 brittle phase) due to strike-slip displacement along the Darn{\'o} Zone sensu lato during the late Cretaceous and/or Tertiary.",
keywords = "Ductile deformation, Folds, Foliation, Inner western Carpathians, Mesozoic, NE Hungary, Strain partitioning, Torna unit",
author = "L. Fodor and B. Koroknai",
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T1 - Ductile deformation and revised lithostratigraphy of the martonyi subunit (torna unit rudabánya MTS.) Northeastern Hungary

AU - Fodor, L.

AU - Koroknai, B.

PY - 2000

Y1 - 2000

N2 - New structural observations and mapping resulted in the reinterpretation of the Martonyi Subunit, part of the metamorphic Torna Unit, NE Hungary. This low-grade metamorphosed Triassic sequence contains lower Anisian Gutenstein Dolomite, a thin transitional pelagic sequence (Bódvarákó Formation?), Carnian Tornaszentandrás Slate, late Carnian-Norian Pötschen Limestone. This stratigraphy is closer to the Bódvarákó windows than to any other Torna subunits. The original sedimentation area could be located on thinned continental crust, relatively close to the oceanic crust of the Meliata branch of the Neotethys. The whole sequence suffered three phases of ductile deformation during Alpine (Cretaceous?) tectogenesis. First, layer-parallel foliation developed (D1), most probably connected to first order nappe stacking. The second deformation phase (D2) is marked by upright, chevron-type folding (D2a). Detachment faults could form at the top of the Gutenstein Dolomite in order to accommodate space problems at fold hinges. The chevron folds were flattened later, during a progressive D2b phase associated with the development of axial plane cleavage and steep reverse faults. The structural style varies depending on locations within folds and on lithology suggesting strain partitioning during the D2 phase. Small kink folds with oblique axes can be related to reactivation of steep faults with oblique slip during the D3 phase, at the transition of brittle-ductile deformation field. The whole unit was thrust upon non-metamorphic unit(s) (D4 brittle phase) due to strike-slip displacement along the Darnó Zone sensu lato during the late Cretaceous and/or Tertiary.

AB - New structural observations and mapping resulted in the reinterpretation of the Martonyi Subunit, part of the metamorphic Torna Unit, NE Hungary. This low-grade metamorphosed Triassic sequence contains lower Anisian Gutenstein Dolomite, a thin transitional pelagic sequence (Bódvarákó Formation?), Carnian Tornaszentandrás Slate, late Carnian-Norian Pötschen Limestone. This stratigraphy is closer to the Bódvarákó windows than to any other Torna subunits. The original sedimentation area could be located on thinned continental crust, relatively close to the oceanic crust of the Meliata branch of the Neotethys. The whole sequence suffered three phases of ductile deformation during Alpine (Cretaceous?) tectogenesis. First, layer-parallel foliation developed (D1), most probably connected to first order nappe stacking. The second deformation phase (D2) is marked by upright, chevron-type folding (D2a). Detachment faults could form at the top of the Gutenstein Dolomite in order to accommodate space problems at fold hinges. The chevron folds were flattened later, during a progressive D2b phase associated with the development of axial plane cleavage and steep reverse faults. The structural style varies depending on locations within folds and on lithology suggesting strain partitioning during the D2 phase. Small kink folds with oblique axes can be related to reactivation of steep faults with oblique slip during the D3 phase, at the transition of brittle-ductile deformation field. The whole unit was thrust upon non-metamorphic unit(s) (D4 brittle phase) due to strike-slip displacement along the Darnó Zone sensu lato during the late Cretaceous and/or Tertiary.

KW - Ductile deformation

KW - Folds

KW - Foliation

KW - Inner western Carpathians

KW - Mesozoic

KW - NE Hungary

KW - Strain partitioning

KW - Torna unit

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VL - 51

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