Metamorphosed and ductilely deformed conodonts from Triassic limestones situated beneath ophiolite complexes

Kopaonik Mountain (Serbia) and Bükk Mountains (NE Hungary) - A preliminary comparison

Milan Sudar, S. Kovács

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Metamorphosed and ductilely deformed conodonts with CAI (Colour Alteration Index) values 5-7 are described and illustrated from Kopaonik Mt, Vardar Zone, Serbia and from Bükk Mts, NE Hungary. They derive from Upper Triassic cherty metalimestones, overthrust by ophiolite complexes. The metamorphism and ductile deformation of the conodont elements evidently took place simultaneously with those of the limestone host rocks, which might have been related to subduction and obduction; however, younger tectonometamorphic events could also have played a role. Unfortunately, illite "crystallinity" indices from Kopaonik Mt are too random for thermometric assessment and geochronological data are missing so far. Nevertheless, by comparison with published data about limestone textural alteration and with previously published metamorphic petrological data from NE Hungary, at least a Szendro-type (min. 400 °C, but less then 500 °C, temperature and 300 MPa pressure) can be supposed for the regional metamorphism of conodont-bearing cherty limestone series of Kopaonik Mt.

Original languageEnglish
Pages (from-to)157-176
Number of pages20
JournalGeologica Carpathica
Volume57
Issue number3
Publication statusPublished - Jun 2006

Fingerprint

ophiolite
Triassic
conodont
limestone
mountain
obduction
ductile deformation
regional metamorphism
crystallinity
illite
host rock
metamorphism
subduction
comparison
temperature
index

Keywords

  • Conodont alterations
  • Ductile deformation
  • Limestone textural alteration
  • NE Hungary
  • Regional metamorphism
  • Serbia
  • Vardar Zone

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

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AB - Metamorphosed and ductilely deformed conodonts with CAI (Colour Alteration Index) values 5-7 are described and illustrated from Kopaonik Mt, Vardar Zone, Serbia and from Bükk Mts, NE Hungary. They derive from Upper Triassic cherty metalimestones, overthrust by ophiolite complexes. The metamorphism and ductile deformation of the conodont elements evidently took place simultaneously with those of the limestone host rocks, which might have been related to subduction and obduction; however, younger tectonometamorphic events could also have played a role. Unfortunately, illite "crystallinity" indices from Kopaonik Mt are too random for thermometric assessment and geochronological data are missing so far. Nevertheless, by comparison with published data about limestone textural alteration and with previously published metamorphic petrological data from NE Hungary, at least a Szendro-type (min. 400 °C, but less then 500 °C, temperature and 300 MPa pressure) can be supposed for the regional metamorphism of conodont-bearing cherty limestone series of Kopaonik Mt.

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